Gentoo Logo

Hylafax: Insecure temporary file creation in xferfaxstats script

Content:

1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200509-21 / hylafax
Release Date September 30, 2005
Latest Revision May 22, 2006: 02
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
net-misc/hylafax < 4.2.2 revision >= 4.2.0-r3, revision >= 4.2.1-r2, >= 4.2.2 All supported architectures

Related bugreports: #106882

Synopsis

Hylafax is vulnerable to linking attacks, potentially allowing a local user to overwrite arbitrary files.

2.  Impact Information

Background

Hylafax is a client-server fax package for class 1 and 2 fax modems.

Description

Javier Fernandez-Sanguino has discovered that xferfaxstats cron script supplied by Hylafax insecurely creates temporary files with predictable filenames.

Impact

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

3.  Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All Hylafax users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose net-misc/hylafax

4.  References



Print

Page updated September 30, 2005

Summary: This is a Gentoo Linux Security Advisory

Security Team
Contact Address

Donate to support our development efforts.

Copyright 2001-2014 Gentoo Foundation, Inc. Questions, Comments? Contact us.