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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_p20170628
  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