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Gentoo: GLSA-201210-05 Normal: Bash Arbitrary Code Execution Risk

gentoo
Calendar Grey October 20, 2012
Dist Gentoo Esm H88
Numerous Bash security flaws identified in Gentoo, enabling unauthorized code execution and possible Denial of Service attacks.
Two vulnerabilities have been found in Bash, the worst of which may allow execution of arbitrary code.

Summary

Two vulnerabilities have been found in Bash: * Bash example scripts do not handle temporary files securely (CVE-2008-5374). * Improper bounds checking in Bash could cause a stack-based buffer overflow (CVE-2012-3410).

Topics%20covered

Topics Covered

security advisory denial of service gentoo arbitrary code execution bash

Resolution

All Bash users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-shells/bash-4.2_p37"

References

[ 1 ] CVE-2008-5374 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-5374 [ 2 ] CVE-2012-3410 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-3410

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201210-05
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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: Bash: Multiple vulnerabilities
Date: October 20, 2012
Bugs: #251319, #431850
ID: 201210-05

Topics%20covered

Topics Covered

security advisory denial of service gentoo arbitrary code execution bash

Synopsis

Two vulnerabilities have been found in Bash, the worst of which may allow execution of arbitrary code.

Background

Bash is the standard GNU Bourne Again SHell.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-shells/bash < 4.2_p37 >= 4.2_p37

Impact

===== A remote attacker could entice a user to open a specially crafted Bash script, possibly resulting in execution of arbitrary code with the privileges of the process, or a Denial of Service condition of the Bash executable. A local attacker may be able to perform symlink attacks to overwrite arbitrary files with the privileges of the user running the application or bypass shell access restrictions.

Workaround

There is no known workaround at this time.

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