Sicherheit: Pufferüberlauf in c-ares

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From: Aaron Bauman <bman@gentoo.org>
To: gentoo-announce@lists.gentoo.org
Message-ID: <52c96a31-5741-103d-1328-19204d2b7da7@gentoo.org>
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=3D"moz-txt-link-freet=
ext" href=3D"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
=3D=3D=3D=3D=3D=3D=3D=3D

A heap-based buffer overflow in c-ares might allow remote attackers to
cause a Denial of Service condition.

Background
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

c-ares is a C library for asynchronous DNS requests (including name
resolves).

Affected packages
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-dns/c-ares < 1.12.0 >=3D
1.=
12.0=20

Description
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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
=3D=3D=3D=3D=3D=3D

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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

There is no known workaround at this time.

Resolution
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

All c-ares users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=3Dnet-dns/c-ares-1.12.0"

References
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

[ 1 ] CVE-2016-5180
<a class=3D"moz-txt-link-freetext" href=3D"http://nvd.nist.gov/nvd.=
cfm?cvename=3DCVE-2016-5180">http://nvd.nist.gov/nvd.cfm?cvename=3DCVE-20=
16-5180</a>

Availability
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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

<a class=3D"moz-txt-link-freetext" href=3D"https://security.gentoo.org/g=
lsa/201701-28">https://security.gentoo.org/glsa/201701-28</a>

Concerns?
=3D=3D=3D=3D=3D=3D=3D=3D=3D

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=3D"moz-txt-link-abbreviated"
href=3D"mailto:security@gentoo.org"=
>security@gentoo.org</a> or alternatively, you may file a bug at
<a class=3D"moz-txt-link-freetext" href=3D"https://bugs.gentoo.org">https=
://bugs.gentoo.org</a>.

License
=3D=3D=3D=3D=3D=3D=3D

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=3D"moz-txt-link-freetext" href=3D"http://creativecommons.org/lic=
enses/by-sa/2.5">http://creativecommons.org/licenses/by-sa/2.5</a></pre>
</body>
</html>

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