GLSA 201210-05: Bash: Multiple vulnerabilities

http://security.gentoo.org/

Severity:	normal
Title:	Bash: Multiple vulnerabilities
Date:	10/20/2012
Bugs:	#251319, #431850
ID:	201210-05

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.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
app-shells/bash	< 4.2_p37	>= 4.2_p37	All supported architectures

Description

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).

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.

Resolution

All Bash users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=app-shells/bash-4.2_p37"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201210-05.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.