CherryPy: Directory traversal vulnerability

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200801-11 / cherrypy
Release Date	January 27, 2008
Latest Revision	January 27, 2008: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
dev-python/cherrypy	< 3.0.2-r1	revision >= 2.2.1-r2, >= 3.0.2-r1	All supported architectures

Related bugreports: #204829

Synopsis

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

2. Impact Information

Background

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

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.

3. Resolution Information

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:

Code Listing 3.1: Resolution

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

All CherryPy 3.0 users should upgrade to the latest version:

Code Listing 3.2: Resolution

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

4. References

CVE-2008-0252

Updated January 27, 2008

Summary: This is a Gentoo Linux Security Advisory

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