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

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Message-Id: <200801271725.25025.rbu@gentoo.org>
Date: Sun, 27 Jan 2008 17:25:24 +0100
From: Robert Buchholz <rbu@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200801-11 ] CherryPy: Directory traversal
	vulnerability

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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@...too.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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