– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
Gentoo Linux Security Advisory GLSA 201701-28
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
https://security.gentoo.org/
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
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
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
<html>
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<body bgcolor=”#FFFFFF” text=”#000000″>
<p>
<meta http-equiv=”content-type” content=”text/html; charset=utf-8″>
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<pre style=”color: rgb(0, 0, 0); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; white-space: pre-wrap;”>- – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
Gentoo Linux Security Advisory GLSA 201701-28
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
<a class=”moz-txt-link-freetext” href=”https://security.gentoo.org/”>https://security.gentoo.org/</a>
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
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-2016-5180</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/glsa/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/licenses/by-sa/2.5″>http://creativecommons.org/licenses/by-sa/2.5</a></pre>
</body>
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