[Full-disclosure] [ GLSA 200801-11 ] CherryPy: Directory traversal vulnerability

[Robert Buchholz]

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Gentoo Linux Security Advisory                           GLSA 200801-11
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: CherryPy: Directory traversal vulnerability
      Date: January 27, 2008
      Bugs: #204829
        ID: 200801-11

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Synopsis
========

CherryPy is vulnerable to a directory traversal that could allow
attackers to read and write arbitrary files.

Background
==========

CherryPy is a Python-based, object-oriented web development framework.

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

    -------------------------------------------------------------------
     Package              /  Vulnerable  /                  Unaffected
    -------------------------------------------------------------------
  1  dev-python/cherrypy     < 3.0.2-r1                   *>= 2.2.1-r2
                                                           >= 3.0.2-r1

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

CherryPy does not sanitize the session id, provided as a cookie value,
in the FileSession._get_file_path() function before using it as part of
the file name.

Impact
======

A remote attacker could exploit this vulnerability to read and possibly
write arbitrary files on the web server, or to hijack valid sessions,
by providing a specially crafted session id. This only affects
applications using file-based sessions.

Workaround
==========

Disable the "FileSession" functionality by using "PostgresqlSession" or
"RamSession" session management in your CherryPy application.

Resolution
==========

All CherryPy 2.2 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-python/cherrypy-2.2.1-r2"

All CherryPy 3.0 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-python/cherrypy-3.0.2-r1"

References
==========

  [ 1 ] CVE-2008-0252
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0252

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

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

  http://security.gentoo.org/glsa/glsa-200801-11.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 at 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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