GLSA 201309-21: klibc: Command Injection

http://security.gentoo.org/

Severity:	normal
Title:	klibc: Command Injection
Date:	09/26/2013
Bugs:	#369075
ID:	201309-21

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.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-libs/klibc	< 1.5.25	>= 1.5.25	All supported architectures

Description

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.

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.

Resolution

All klibc users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=dev-libs/klibc-1.5.25"

References

CVE-2011-1930

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201309-21.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.