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Gentoo: GLSA-201309-20 Normal: Dropbear Arbitrary Code Execution Risk

gentoo
Calendar Grey September 27, 2013
Dist Gentoo Esm H88
Gentoo Linux Advisory GLSA 202310-15 addresses severe vulnerabilities in OpenSSH presenting a critical risk of unauthorized access.
Multiple vulnerabilities have been found in Dropbear, the worst of which could lead to arbitrary code execution.

Summary

Multiple vulnerabilities have been discovered in Dropbear. Please review the CVE identifier and Gentoo bug referenced below for details.

Topics%20covered

Topics Covered

security advisory Gentoo arbitrary code execution Denial of Service normal severity SSH server Dropbear

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: https://security.gentoo.org/glsa/201309-20
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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.

Severity: Normal
Title: Dropbear: Multiple vulnerabilities
Date: September 26, 2013
Bugs: #328409, #405607
ID: 201309-20

Topics%20covered

Topics Covered

security advisory Gentoo arbitrary code execution Denial of Service normal severity SSH server Dropbear

Synopsis

Multiple vulnerabilities have been found in Dropbear, the worst of which could lead to arbitrary code execution.

Background

Dropbear is an SSH server and client designed with a small memory footprint.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/dropbear < 2012.55 >= 2012.55

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.

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