[ GLSA 200807-01 ] Python: Multiple integer overflows

[Tobias Heinlein <keytoaster () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200807-01
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Python: Multiple integer overflows
      Date: July 01, 2008
      Bugs: #216673, #217221
        ID: 200807-01

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Synopsis
========

Multiple integer overflows may allow for Denial of Service.

Background
==========

Python is an interpreted, interactive, object-oriented programming
language.

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

    -------------------------------------------------------------------
     Package          /   Vulnerable   /                    Unaffected
    -------------------------------------------------------------------
  1  dev-lang/python      < 2.4.4-r13                     *>= 2.3.6-r6
                                                          >= 2.4.4-r13

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

Multiple vulnerabilities were discovered in Python:

* David Remahl reported multiple integer overflows in the file
  imageop.c, leading to a heap-based buffer overflow (CVE-2008-1679).
  This issue is due to an incomplete fix for CVE-2007-4965.

* Justin Ferguson discovered that an integer signedness error in the
  zlib extension module might trigger insufficient memory allocation
  and a buffer overflow via a negative signed integer (CVE-2008-1721).

* Justin Ferguson discovered that insufficient input validation in
  the PyString_FromStringAndSize() function might lead to a buffer
  overflow (CVE-2008-1887).

Impact
======

A remote attacker could exploit these vulnerabilities to cause a Denial
of Service or possibly the remote execution of arbitrary code with the
privileges of the user running Python.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

The imageop module is no longer built in the unaffected versions.

All Python 2.3 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-lang/python-2.3.6-r6"

All Python 2.4 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-lang/python-2.4.4-r13"

References
==========

  [ 1 ] CVE-2008-1679
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1679
  [ 2 ] CVE-2008-1721
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1721
  [ 3 ] CVE-2008-1887
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1887

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

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

  http://security.gentoo.org/glsa/glsa-200807-01.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 () gentoo org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2008 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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