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[gentoo-announce] [ GLSA 201708-05 ] RAR and UnRAR: User-assisted execution of

Posted on 21 August 2017
Gentoo-announce

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From: Thomas Deutschmann <whissi@gentoo.org>
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To: gentoo-announce@lists.gentoo.org
Message-ID: <88b51cb0-1938-0ddb-d906-8aa9d7c422c6@gentoo.org>
Subject: [ GLSA 201708-05 ] RAR and UnRAR: User-assisted execution of
arbitrary code

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Gentoo Linux Security Advisory GLSA 201708-05
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https://security.gentoo.org/
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Severity: Normal
Title: RAR and UnRAR: User-assisted execution of arbitrary code
Date: August 21, 2017
Bugs: #622342, #622382
ID: 201708-05

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Synopsis
========
An integer overflow in RAR and UnRAR might allow remote attackers to
execute arbitrary code.

Background
==========
RAR and UnRAR provide command line interfaces for compressing and
decompressing RAR files.

Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-arch/rar < 5.5.0_beta4_p20170628>= 5.5.0_beta4_p2017=0628
2 app-arch/unrar < 5.5.5 >= 5.5.5
-------------------------------------------------------------------
2 affected packages

Description
===========
A VMSF_DELTA memory corruption was discovered in which an integer
overflow can be caused in DataSize+CurChannel. The result is a negative
value of the "DestPos" variable which allows writing out of bounds when
setting Mem[DestPos].

Impact
======
A remote attacker, by enticing a user to open a specially crafted
archive, could execute arbitrary code with the privileges of the
process.

Workaround
==========
There is no known workaround at this time.

Resolution
==========
All RAR users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot -v ">=app-arch/rar-5.5.0_beta4_p20170628"

All UnRAR users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/unrar-5.5.5"

References
==========
[ 1 ] CVE-2012-6706
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-6706

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

https://security.gentoo.org/glsa/201708-05

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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