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Gentoo: 2013-09-21 Normal: Klibc Command Injection Risk

gentoo
Calendar Grey September 27, 2013
Scroller Gentoo
A security flaw in Gentoo's klibc could enable remote code execution through manipulated DHCP options. It is advised to perform an upgrade to reduce potential threats.
A vulnerability in klibc could allow remote attackers to execute arbitrary shell code.

Summary

The ipconfig utility in klibc writes DHCP options to /tmp/net-$DEVICE.conf, and this file is later sourced by other scripts to get defined variables. The options written to this file are not properly escaped.

Topics%20covered

Topics Covered

security advisory gentoo command injection normal klibc

Resolution

All klibc users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=dev-libs/klibc-1.5.25"

References

[ 1 ] CVE-2011-1930 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-1930

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201309-21
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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: klibc: Command Injection
Date: September 26, 2013
Bugs: #369075
ID: 201309-21

Topics%20covered

Topics Covered

security advisory gentoo command injection normal klibc

Synopsis

A vulnerability in klibc could allow remote attackers to execute arbitrary shell code.

Background

klibc is a minimalistic libc used for making an initramfs.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 dev-libs/klibc < 1.5.25 >= 1.5.25

Impact

===== A remote attacker could send a specially crafted DHCP reply, which could execute arbitrary shell code with the privileges of any process which sources DHCP options.

Workaround

There is no known workaround at this time.