full-disclosure - [ GLSA 200711-28 ] Perl: Buffer overflow

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Date: Mon, 19 Nov 2007 22:10:42 +0100
From: Pierre-Yves Rofes <py@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200711-28 ] Perl: Buffer overflow

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Gentoo Linux Security Advisory                           GLSA 200711-28
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Perl: Buffer overflow
      Date: November 19, 2007
      Bugs: #198196
        ID: 200711-28

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Synopsis
========

A buffer overflow in the Regular Expression engine in Perl possibly
allows for the execution of arbitrary code.

Background
==========

Perl is a stable, cross-platform programming language created by Larry
Wall.

Affected packages
=================

    -------------------------------------------------------------------
     Package        /  Vulnerable  /                        Unaffected
    -------------------------------------------------------------------
  1  dev-lang/perl     < 5.8.8-r4                          >= 5.8.8-r4

Description
===========

Tavis Ormandy and Will Drewry (Google Security Team) discovered a
heap-based buffer overflow in the Regular Expression engine (regcomp.c)
that occurs when switching from byte to Unicode (UTF-8) characters in a
regular expression.

Impact
======

A remote attacker could either entice a user to compile a specially
crafted regular expression or actively compile it in case the script
accepts remote input of regular expressions, possibly leading to the
execution of arbitrary code with the privileges of the user running
Perl.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Perl users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-lang/perl-5.8.8-r4"

References
==========

  [ 1 ] CVE-2007-5116
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5116

Availability
============

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

  http://security.gentoo.org/glsa/glsa-200711-28.xml

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@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2007 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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