ID

VAR-201206-0202

CVE

CVE-2012-0920

TITLE

Dropbear SSH Server Remote Code Execution Vulnerability

DESCRIPTION

Use-after-free vulnerability in Dropbear SSH Server 0.52 through 2012.54, when command restriction and public key authentication are enabled, allows remote authenticated users to execute arbitrary code and bypass command restrictions via multiple crafted command requests, related to "channels concurrency.". Dropbear SSH Server is a small Secure Shell server for embedded environments. A remote code execution vulnerability exists in Dropbear SSH Server that was caused by a post-release error. An attacker could exploit the vulnerability to execute arbitrary code with root-level privileges, which could allow an attacker to fully manipulate the affected system. Note: To exploit the issue an attacker must be authenticated using a public key and a command restriction is enforced. Solution: Upgrade to version 2012.55 or higher. 2012-02-24 - Coordinated public release of advisory. Credit: This vulnerability was discovered by Danny Fullerton from Mantor Organization. Special thanks to Matt. This fixes a vulnerability, which can be exploited by malicious users to gain escalated privileges. For more information: SA48147 SOLUTION: Apply updated packages via the apt-get package manager. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - ------------------------------------------------------------------------- Debian Security Advisory DSA-2456-1 security@debian.org http://www.debian.org/security/ Moritz Muehlenhoff April 23, 2012 http://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : dropbear Vulnerability : use after free Problem type : remote Debian-specific: no CVE ID : CVE-2012-0920 Danny Fullerton discovered a use-after-free in the Dropbear SSH daemon, resulting in potential execution of arbitrary code. For the stable distribution (squeeze), this problem has been fixed in version 0.52-5+squeeze1. For the testing distribution (wheezy), this problem has been fixed in version 2012.55-1. For the unstable distribution (sid), this problem has been fixed in version 2012.55-1. We recommend that you upgrade your dropbear packages. Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: http://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAk+XCosACgkQXm3vHE4uylrKpQCfZpU4eKxztqi8zGzsAKdxzhLV kOcAoIshssbewzstn+sNTIJyNP7MJ10i =uWaI -----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/ . ---------------------------------------------------------------------- Become a PSI 3.0 beta tester! Test-drive the new beta version and tell us what you think about its extended automatic update function and significantly enhanced user-interface. Download it here! http://secunia.com/psi_30_beta_launch ---------------------------------------------------------------------- TITLE: Dropbear SSH Server Use-After-Free Vulnerability SECUNIA ADVISORY ID: SA48147 VERIFY ADVISORY: Secunia.com http://secunia.com/advisories/48147/ Customer Area (Credentials Required) https://ca.secunia.com/?page=viewadvisory&vuln_id=48147 RELEASE DATE: 2012-02-27 DISCUSS ADVISORY: http://secunia.com/advisories/48147/#comments AVAILABLE ON SITE AND IN CUSTOMER AREA: * Last Update * Popularity * Comments * Criticality Level * Impact * Where * Solution Status * Operating System / Software * CVE Reference(s) http://secunia.com/advisories/48147/ ONLY AVAILABLE IN CUSTOMER AREA: * Authentication Level * Report Reliability * Secunia PoC * Secunia Analysis * Systems Affected * Approve Distribution * Remediation Status * Secunia CVSS Score * CVSS https://ca.secunia.com/?page=viewadvisory&vuln_id=48147 ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI: * AUTOMATED SCANNING http://secunia.com/vulnerability_scanning/personal/ http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/ DESCRIPTION: Danny Fullerton has reported a vulnerability in Dropbear SSH Server, which can be exploited by malicious users to gain escalated privileges. The vulnerability is reported in version 0.52 through 2011.54. SOLUTION: Update to version 2012.55 PROVIDED AND/OR DISCOVERED BY: Danny Fullerton, Mantor Organization ORIGINAL ADVISORY: Dropbear: http://matt.ucc.asn.au/dropbear/CHANGES Danny Fullerton: http://archives.neohapsis.com/archives/fulldisclosure/2012-02/0404.html OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ DEEP LINKS: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ EXPLOIT: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help private users 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 ---------------------------------------------------------------------- . - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201309-20 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: Dropbear: Multiple vulnerabilities Date: September 26, 2013 Bugs: #328409, #405607 ID: 201309-20 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple vulnerabilities have been found in Dropbear, the worst of which could lead to arbitrary code execution. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/dropbear < 2012.55 >= 2012.55 Description =========== Multiple vulnerabilities have been discovered in Dropbear. Please review the CVE identifier and Gentoo bug referenced below for details. Impact ====== A remote attacker could send a specially crafted request to trigger a use-after-free condition, possibly resulting in arbitrary code execution or a Denial of Service condition. Additionally, the bundled version of libtommath has an error in its prime number generation, which could result in the generation of weak keys. Workaround ========== There is no known workaround at this time. Resolution ========== All Dropbear users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/dropbear-2012.55" References ========== [ 1 ] CVE-2012-0920 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-0920 [ 2 ] libtommath Gentoo bug https://bugs.gentoo.org/show_bug.cgi?id=328383 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201309-20.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 2013 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

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

resource management error

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Danny Fullerton

SOURCES

LAST UPDATE DATE

2024-11-23T22:35:28.930000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE