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Gentoo Linux Security Advisory - klibc: Command Injection (GLSA 201309-21)
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Gentoo Linux Security Advisory                           GLSA 201309-21
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: klibc: Command Injection
     Date: September 26, 2013
     Bugs: #369075
       ID: 201309-21

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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
    -------------------------------------------------------------------
  1  dev-libs/klibc               < 1.5.25                  >= 1.5.25

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
==========

[ 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:

 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.

License
=======

Copyright 2013 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5




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