Home / mailings [gentoo-announce] [ GLSA 201701-28 ] c-ares: Heap-based buffer overflow
Posted on 11 January 2017
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From: Aaron Bauman <bman@gentoo.org>
To: gentoo-announce@lists.gentoo.org
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Subject: [ GLSA 201701-28 ] c-ares: Heap-based buffer overflow
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Gentoo Linux Security Advisory GLSA 201701-28
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https://security.gentoo.org/
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Severity: Normal
Title: c-ares: Heap-based buffer overflow
Date: January 11, 2017
Bugs: #595536
ID: 201701-28
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Synopsis
========
A heap-based buffer overflow in c-ares might allow remote attackers to
cause a Denial of Service condition.
Background
==========
c-ares is a C library for asynchronous DNS requests (including name
resolves).
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-dns/c-ares < 1.12.0 >= 1.12.0
Description
===========
A hostname with an escaped trailing dot (such as "hello\.") would have
its size calculated incorrectly leading to a single byte written beyond
the end of a buffer on the heap.
Impact
======
A remote attacker, able to provide a specially crafted hostname to an
application using c-ares, could potentially cause a Denial of Service
condition.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All c-ares users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/c-ares-1.12.0"
References
==========
[ 1 ] CVE-2016-5180
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-5180
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201701-28
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 2017 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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Gentoo Linux Security Advisory GLSA 201701-28
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<a class="moz-txt-link-freet=ext" href="https://security.gentoo.org/">https://security.gentoo.org/</=a>
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Severity: Normal
Title: c-ares: Heap-based buffer overflow
Date: January 11, 2017
Bugs: #595536
ID: 201701-28
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis
========
A heap-based buffer overflow in c-ares might allow remote attackers to
cause a Denial of Service condition.
Background
==========
c-ares is a C library for asynchronous DNS requests (including name
resolves).
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-dns/c-ares < 1.12.0 >= 1.=12.0
Description
===========
A hostname with an escaped trailing dot (such as "hello\.") would have
its size calculated incorrectly leading to a single byte written beyond
the end of a buffer on the heap.
Impact
======
A remote attacker, able to provide a specially crafted hostname to an
application using c-ares, could potentially cause a Denial of Service
condition.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All c-ares users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/c-ares-1.12.0"
References
==========
[ 1 ] CVE-2016-5180
<a class="moz-txt-link-freetext" href="http://nvd.nist.gov/nvd.=cfm?cvename=CVE-2016-5180">http://nvd.nist.gov/nvd.cfm?cvename=CVE-20=16-5180</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/201701-28">https://security.gentoo.org/glsa/201701-28</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 2017 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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