Dropbear/Klibc Updates for Gentoo
Posted on: 09/27/2013 08:39 AM

The following two security updates has been released for Gentoo Linux: [ GLSA 201309-21 ] klibc: Command Injection and [ GLSA 201309-20 ] Dropbear: Multiple vulnerabilities

[ GLSA 201309-21 ] klibc: Command Injection
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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




[ GLSA 201309-20 ] Dropbear: Multiple vulnerabilities
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Gentoo Linux Security Advisory GLSA 201309-20
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http://security.gentoo.org/
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Severity: Normal
Title: Dropbear: Multiple vulnerabilities
Date: September 26, 2013
Bugs: #328409, #405607
ID: 201309-20

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Synopsis
========

Multiple vulnerabilities have been found in Dropbear, the worst of
which could lead to arbitrary code execution.

Background
==========

Dropbear is an SSH server and client designed with a small memory
footprint.

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/dropbear < 2012.55 >= 2012.55

Description
===========

Multiple vulnerabilities have been discovered in Dropbear. Please
review the CVE identifier and Gentoo bug referenced below for details.

Impact
======

A remote attacker could send a specially crafted request to trigger a
use-after-free condition, possibly resulting in arbitrary code
execution or a Denial of Service condition. Additionally, the bundled
version of libtommath has an error in its prime number generation,
which could result in the generation of weak keys.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Dropbear users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/dropbear-2012.55"

References
==========

[ 1 ] CVE-2012-0920
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-0920
[ 2 ] libtommath Gentoo bug
https://bugs.gentoo.org/show_bug.cgi?id=328383

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-201309-20.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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