Gentoo: MySQL Insecure temporary file creation
Posted by Joseph Shakespeare   
Gentoo MySQL is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.
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Gentoo Linux Security Advisory                           GLSA 200501-33
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: MySQL: Insecure temporary file creation
      Date: January 23, 2005
      Bugs: #77805
        ID: 200501-33

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Synopsis
========

MySQL is vulnerable to symlink attacks, potentially allowing a local
user to overwrite arbitrary files.

Background
==========

MySQL is a fast, multi-threaded, multi-user SQL database server.

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

    -------------------------------------------------------------------
     Package       /   Vulnerable   /                       Unaffected
    -------------------------------------------------------------------
  1  dev-db/mysql      < 4.0.22-r2                        >= 4.0.22-r2

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

Javier Fernandez-Sanguino Pena from the Debian Security Audit Project
discovered that the 'mysqlaccess' script creates temporary files in
world-writeable directories with predictable names.

Impact
======

A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
the mysqlaccess script is executed, this would result in the file being
overwritten with the rights of the user running the software, which
could be the root user.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All MySQL users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-db/mysql-4.0.22-r2"

References
==========

  [ 1 ] CAN-2005-0004
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0004
  [ 2 ] Secunia Advisory SA13867
        http://secunia.com/advisories/13867/

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

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

  http://security.gentoo.org/glsa/glsa-200501-33.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 2005 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/2.0