Home / mailings [gentoo-announce] [ GLSA 201612-25 ] CrackLib: Buffer overflow
Posted on 08 December 2016
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From: Aaron Bauman <bman@gentoo.org>
To: gentoo-announce@lists.gentoo.org
Message-ID: <9f024c3d-043a-474c-d977-0a57101a8ee1@gentoo.org>
Subject: [ GLSA 201612-25 ] CrackLib: Buffer overflow
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Gentoo Linux Security Advisory GLSA 201612-25
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https://security.gentoo.org/
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Severity: Normal
Title: CrackLib: Buffer overflow
Date: December 08, 2016
Bugs: #591456
ID: 201612-25
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Synopsis
========
A vulnerability in CrackLib could lead to the execution of arbitrary
code.
Background
==========
CrackLib is a library used to enforce strong passwords by comparing
user selected passwords to words in chosen word lists.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-libs/cracklib < 2.9.6-r1 >= 2.9.6-r1
Description
===========
A stack-based buffer overflow was discovered in the FascistGecosUser
function of lib/fascist.c.
Impact
======
A local attacker could set a specially crafted GECOS field value in
"/etc/passwd"; possibly resulting in the execution of arbitrary code
with the privileges of the process, a Denial of Service condition, or
the escalation of privileges.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All CrackLib users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-libs/cracklib-2.9.6-r1"
References
==========
[ 1 ] CVE-2016-6318
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-6318
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201612-25
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 2016 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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<pre style="color: rgb(0, 0, 0); font-style: normal; font-variant-l=igatures: normal; font-variant-caps: normal; font-weight: normal; letter-=spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-tr=ansform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0=px; word-wrap: break-word; white-space: pre-wrap;">- - - - - - - - - - - =- - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 201612-25
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<a class="moz-txt-link-freet=ext" href="https://security.gentoo.org/">https://security.gentoo.org/</=a>
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal
Title: CrackLib: Buffer overflow
Date: December 08, 2016
Bugs: #591456
ID: 201612-25
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis
========
A vulnerability in CrackLib could lead to the execution of arbitrary
code.
Background
==========
CrackLib is a library used to enforce strong passwords by comparing
user selected passwords to words in chosen word lists.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-libs/cracklib < 2.9.6-r1 >= 2.9.=6-r1
Description
===========
A stack-based buffer overflow was discovered in the FascistGecosUser
function of lib/fascist.c.
Impact
======
A local attacker could set a specially crafted GECOS field value in
"/etc/passwd"; possibly resulting in the execution of arbitrary code
with the privileges of the process, a Denial of Service condition, or
the escalation of privileges.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All CrackLib users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-libs/cracklib-2.9.6-r1"
References
==========
[ 1 ] CVE-2016-6318
<a class="moz-txt-link-freetext" href="http://nvd.nist.gov/nvd.=cfm?cvename=CVE-2016-6318">http://nvd.nist.gov/nvd.cfm?cvename=CVE-20=16-6318</a>
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
<a class="moz-txt-link-freetext" href="https://security.gentoo.org/g=lsa/201612-25">https://security.gentoo.org/glsa/201612-25</a>
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
<a class="moz-txt-link-abbreviated" href="mailto:security@gentoo.org"=>security@gentoo.org</a> or alternatively, you may file a bug at
<a class="moz-txt-link-freetext" href="https://bugs.gentoo.org">https=://bugs.gentoo.org</a>.
License
=======
Copyright 2016 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.
<a class="moz-txt-link-freetext" href="http://creativecommons.org/lic=enses/by-sa/2.5">http://creativecommons.org/licenses/by-sa/2.5</a></pre>
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