ID

VAR-201409-1155

CVE

CVE-2014-7169

TITLE

GNU Bash shell executes commands in exported functions in environment variables

DESCRIPTION

GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed function definitions in the values of environment variables, which allows remote attackers to write to files or possibly have unknown other impact via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-6271. QNAP Systems, Inc. Provided by QTS teeth, Turbo NAS for OS is. QTS for, GNU Bash Vulnerability (JVNVU#97219505) caused by OS Command injection vulnerability (CWE-78) Exists. This vulnerability information is based on the Information Security Early Warning Partnership. IPA Report to JPCERT/CC Coordinated with the developer. Reporter : University of Electro-Communications Wakisaka Yuki MrAny application permission OS The command may be executed. An attacker can exploit this issue to execute arbitrary code within the context of the affected application. Failed exploit attempts will result in a denial-of-service condition. GNU Bash 3.2 and later are vulnerable; prior versions may also be affected. NOTE: This vulnerability can only be exploited if the attacker already has valid administrative login credentials. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: bash security update Advisory ID: RHSA-2014:1306-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-1306.html Issue date: 2014-09-26 CVE Names: CVE-2014-7169 ===================================================================== 1. Summary: Updated bash packages that fix one security issue are now available for Red Hat Enterprise Linux 5, 6, and 7. Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64 Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64 Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64 3. Description: The GNU Bourne Again shell (Bash) is a shell and command language interpreter compatible with the Bourne shell (sh). Bash is the default shell for Red Hat Enterprise Linux. It was found that the fix for CVE-2014-6271 was incomplete, and Bash still allowed certain characters to be injected into other environments via specially crafted environment variables. An attacker could potentially use this flaw to override or bypass environment restrictions to execute shell commands. Certain services and applications allow remote unauthenticated attackers to provide environment variables, allowing them to exploit this issue. (CVE-2014-7169) Applications which directly create bash functions as environment variables need to be made aware of changes to the way names are handled by this update. For more information see the Knowledgebase article at https://access.redhat.com/articles/1200223 Note: Docker users are advised to use "yum update" within their containers, and to commit the resulting changes. For additional information on CVE-2014-6271 and CVE-2014-7169, refer to the aforementioned Knowledgebase article. All bash users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/articles/11258 5. Bugs fixed (https://bugzilla.redhat.com/): 1146319 - CVE-2014-7169 bash: code execution via specially-crafted environment (Incomplete fix for CVE-2014-6271) 6. Package List: Red Hat Enterprise Linux Desktop (v. 5 client): Source: bash-3.2-33.el5_11.4.src.rpm i386: bash-3.2-33.el5_11.4.i386.rpm bash-debuginfo-3.2-33.el5_11.4.i386.rpm x86_64: bash-3.2-33.el5_11.4.x86_64.rpm bash-debuginfo-3.2-33.el5_11.4.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: bash-3.2-33.el5_11.4.src.rpm i386: bash-3.2-33.el5_11.4.i386.rpm bash-debuginfo-3.2-33.el5_11.4.i386.rpm ia64: bash-3.2-33.el5_11.4.i386.rpm bash-3.2-33.el5_11.4.ia64.rpm bash-debuginfo-3.2-33.el5_11.4.i386.rpm bash-debuginfo-3.2-33.el5_11.4.ia64.rpm ppc: bash-3.2-33.el5_11.4.ppc.rpm bash-debuginfo-3.2-33.el5_11.4.ppc.rpm s390x: bash-3.2-33.el5_11.4.s390x.rpm bash-debuginfo-3.2-33.el5_11.4.s390x.rpm x86_64: bash-3.2-33.el5_11.4.x86_64.rpm bash-debuginfo-3.2-33.el5_11.4.x86_64.rpm Red Hat Enterprise Linux Desktop (v. 6): Source: bash-4.1.2-15.el6_5.2.src.rpm i386: bash-4.1.2-15.el6_5.2.i686.rpm bash-debuginfo-4.1.2-15.el6_5.2.i686.rpm x86_64: bash-4.1.2-15.el6_5.2.x86_64.rpm bash-debuginfo-4.1.2-15.el6_5.2.x86_64.rpm Red Hat Enterprise Linux Desktop Optional (v. 6): Source: bash-4.1.2-15.el6_5.2.src.rpm i386: bash-debuginfo-4.1.2-15.el6_5.2.i686.rpm bash-doc-4.1.2-15.el6_5.2.i686.rpm x86_64: bash-debuginfo-4.1.2-15.el6_5.2.x86_64.rpm bash-doc-4.1.2-15.el6_5.2.x86_64.rpm Red Hat Enterprise Linux HPC Node (v. 6): Source: bash-4.1.2-15.el6_5.2.src.rpm x86_64: bash-4.1.2-15.el6_5.2.x86_64.rpm bash-debuginfo-4.1.2-15.el6_5.2.x86_64.rpm Red Hat Enterprise Linux HPC Node Optional (v. 6): Source: bash-4.1.2-15.el6_5.2.src.rpm x86_64: bash-debuginfo-4.1.2-15.el6_5.2.x86_64.rpm bash-doc-4.1.2-15.el6_5.2.x86_64.rpm Red Hat Enterprise Linux Server (v. 6): Source: bash-4.1.2-15.el6_5.2.src.rpm i386: bash-4.1.2-15.el6_5.2.i686.rpm bash-debuginfo-4.1.2-15.el6_5.2.i686.rpm ppc64: bash-4.1.2-15.el6_5.2.ppc64.rpm bash-debuginfo-4.1.2-15.el6_5.2.ppc64.rpm s390x: bash-4.1.2-15.el6_5.2.s390x.rpm bash-debuginfo-4.1.2-15.el6_5.2.s390x.rpm x86_64: bash-4.1.2-15.el6_5.2.x86_64.rpm bash-debuginfo-4.1.2-15.el6_5.2.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 6): Source: bash-4.1.2-15.el6_5.2.src.rpm i386: bash-debuginfo-4.1.2-15.el6_5.2.i686.rpm bash-doc-4.1.2-15.el6_5.2.i686.rpm ppc64: bash-debuginfo-4.1.2-15.el6_5.2.ppc64.rpm bash-doc-4.1.2-15.el6_5.2.ppc64.rpm s390x: bash-debuginfo-4.1.2-15.el6_5.2.s390x.rpm bash-doc-4.1.2-15.el6_5.2.s390x.rpm x86_64: bash-debuginfo-4.1.2-15.el6_5.2.x86_64.rpm bash-doc-4.1.2-15.el6_5.2.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 6): Source: bash-4.1.2-15.el6_5.2.src.rpm i386: bash-4.1.2-15.el6_5.2.i686.rpm bash-debuginfo-4.1.2-15.el6_5.2.i686.rpm x86_64: bash-4.1.2-15.el6_5.2.x86_64.rpm bash-debuginfo-4.1.2-15.el6_5.2.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 6): Source: bash-4.1.2-15.el6_5.2.src.rpm i386: bash-debuginfo-4.1.2-15.el6_5.2.i686.rpm bash-doc-4.1.2-15.el6_5.2.i686.rpm x86_64: bash-debuginfo-4.1.2-15.el6_5.2.x86_64.rpm bash-doc-4.1.2-15.el6_5.2.x86_64.rpm Red Hat Enterprise Linux Client (v. 7): Source: bash-4.2.45-5.el7_0.4.src.rpm x86_64: bash-4.2.45-5.el7_0.4.x86_64.rpm bash-debuginfo-4.2.45-5.el7_0.4.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): x86_64: bash-debuginfo-4.2.45-5.el7_0.4.x86_64.rpm bash-doc-4.2.45-5.el7_0.4.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: bash-4.2.45-5.el7_0.4.src.rpm x86_64: bash-4.2.45-5.el7_0.4.x86_64.rpm bash-debuginfo-4.2.45-5.el7_0.4.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): x86_64: bash-debuginfo-4.2.45-5.el7_0.4.x86_64.rpm bash-doc-4.2.45-5.el7_0.4.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: bash-4.2.45-5.el7_0.4.src.rpm ppc64: bash-4.2.45-5.el7_0.4.ppc64.rpm bash-debuginfo-4.2.45-5.el7_0.4.ppc64.rpm s390x: bash-4.2.45-5.el7_0.4.s390x.rpm bash-debuginfo-4.2.45-5.el7_0.4.s390x.rpm x86_64: bash-4.2.45-5.el7_0.4.x86_64.rpm bash-debuginfo-4.2.45-5.el7_0.4.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): ppc64: bash-debuginfo-4.2.45-5.el7_0.4.ppc64.rpm bash-doc-4.2.45-5.el7_0.4.ppc64.rpm s390x: bash-debuginfo-4.2.45-5.el7_0.4.s390x.rpm bash-doc-4.2.45-5.el7_0.4.s390x.rpm x86_64: bash-debuginfo-4.2.45-5.el7_0.4.x86_64.rpm bash-doc-4.2.45-5.el7_0.4.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: bash-4.2.45-5.el7_0.4.src.rpm x86_64: bash-4.2.45-5.el7_0.4.x86_64.rpm bash-debuginfo-4.2.45-5.el7_0.4.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): x86_64: bash-debuginfo-4.2.45-5.el7_0.4.x86_64.rpm bash-doc-4.2.45-5.el7_0.4.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/#package 7. References: https://www.redhat.com/security/data/cve/CVE-2014-7169.html https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/articles/1200223 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2014 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFUJMc4XlSAg2UNWIIRAsowAKCeLFE4QctUYTBC7bvqd6RTgUMptACcC2jt wqMN2oFvaGhf5SqiZHqpyOA= =Unt1 -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201409-10 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: Bash: Code Injection (Updated fix for GLSA 201409-09) Date: September 25, 2014 Bugs: #523592 ID: 201409-10 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== A parsing flaw related to functions and environments in Bash could allow attackers to inject code. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-shells/bash < 4.2_p48-r1 *>= 3.1_p18-r1 *>= 3.2_p52-r1 *>= 4.0_p39-r1 *>= 4.1_p12-r1 >= 4.2_p48-r1 Description =========== Stephane Chazelas reported that Bash incorrectly handles function definitions, allowing attackers to inject arbitrary code (CVE-2014-6271). Gentoo Linux informed about this issue in GLSA 201409-09. Tavis Ormandy reported that the patch for CVE-2014-6271 was incomplete. As such, this GLSA supersedes GLSA 201409-09. Workaround ========== There is no known workaround at this time. Resolution ========== All Bash 3.1 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-shells/bash-3.1_p18-r1" All Bash 3.2 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-shells/bash-3.2_p52-r1" All Bash 4.0 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-shells/bash-4.0_p39-r1" All Bash 4.1 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-shells/bash-4.1_p12-r1" All Bash 4.2 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-shells/bash-4.2_p48-r1" References ========== [ 1 ] CVE-2014-7169 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-7169 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201409-10.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2014 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5 . All MDS and Nexus 5K switches can function in this configuration. Access is available through the console port. HP StoreEver ESL E-series Tape Library - Disable DHCP and only use static IP addressing. HP Virtual Library System (VLS) - Disable DHCP and only use static IP addressing. Release Date: 2014-11-11 Last Updated: 2014-11-11 Potential Security Impact: Remote code execution Source: Hewlett-Packard Company, HP Software Security Response Team VULNERABILITY SUMMARY A potential security vulnerability has been identified with HP StoreFabric H-series switches running Bash Shell. References: CVE-2014-6271 CVE-2014-6277 CVE-2014-6278 CVE-2014-7169 CVE-2014-7186 CVE-2014-7187 SSRT101747 SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. All HP StoreFabric H-series switches BACKGROUND CVSS 2.0 Base Metrics =========================================================== Reference Base Vector Base Score CVE-2014-6271 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10.0 CVE-2014-6277 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10.0 CVE-2014-6278 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10.0 CVE-2014-7169 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10.0 CVE-2014-7186 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10.0 CVE-2014-7187 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10.0 =========================================================== Information on CVSS is documented in HP Customer Notice: HPSN-2008-002 RESOLUTION HP is actively working on a firmware update to resolve the vulnerability in HP StoreFabric H-series switches. MITIGATION INFORMATION HP recommends the following steps to reduce the risk of this vulnerability: - Place the HP StoreFabric H-series switch and other data center critical infrastructure behind a firewall to disallow access from the Internet. - Change all HP StoreFabric switch default account passwords, including the root passwords, from the default factory passwords. - Examine the list of accounts, including ones on the switch and those existing on remote authentication servers such as RADIUS, LDAP, and TACAS+, to ensure only necessary personnel can gain access to HP StoreFabric H-series switches. Delete guest accounts and temporary accounts created for one-time usage needs. - To avoid possible exploit through the embedded web GUI, QuickTools, disable the web server with the following procedure: NOTE: After completing this procedure, the user will not be able to manage the switch using QuickTools. Login to the Command Line Interface (CLI). Execute the "admin start" command to enter into an admin session. Execute the "set setup services" command and change setting for EmbeddedGUIEnabled to "False". HISTORY Version:1 (rev.1) - 11 November 2014 Initial release Third Party Security Patches: Third party security patches that are to be installed on systems running HP software products should be applied in accordance with the customer's patch management policy. Support: For issues about implementing the recommendations of this Security Bulletin, contact normal HP Services support channel. For other issues about the content of this Security Bulletin, send e-mail to security-alert@hp.com. Report: To report a potential security vulnerability with any HP supported product, send Email to: security-alert@hp.com Subscribe: To initiate a subscription to receive future HP Security Bulletin alerts via Email: http://h41183.www4.hp.com/signup_alerts.php?jumpid=hpsc_secbulletins Security Bulletin Archive: A list of recently released Security Bulletins is available here: https://h20564.www2.hp.com/portal/site/hpsc/public/kb/secBullArchive/ Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB. 3C = 3COM 3P = 3rd Party Software GN = HP General Software HF = HP Hardware and Firmware MP = MPE/iX MU = Multi-Platform Software NS = NonStop Servers OV = OpenVMS PI = Printing and Imaging PV = ProCurve ST = Storage Software TU = Tru64 UNIX UX = HP-UX Copyright 2014 Hewlett-Packard Development Company, L.P. Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions contained herein. The information provided is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental,special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this document is subject to change without notice. Hewlett-Packard Company and the names of Hewlett-Packard products referenced herein are trademarks of Hewlett-Packard Company in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners. This vulnerability allows users that have been granted access to a shell script to escalate privilege and execute unrestricted commands at the same security level as the Bash script. Patch and maintain Lightweight Directory Access Protocol (LDAP) and web servers. Use virus scanners, intrusion detection/prevention systems (IDS/IPS), and vulnerability scanners regularly. Apply all recommended HP Firmware updates

AFFECTED PRODUCTS