GLSA 200509-21: Hylafax: Insecure temporary file creation in xferfaxstats script

http://security.gentoo.org/

Severity:	normal
Title:	Hylafax: Insecure temporary file creation in xferfaxstats script
Date:	09/30/2005
Bugs:	#106882
ID:	200509-21

Synopsis

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

Background

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

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-misc/hylafax	< 4.2.2	>= 4.2.0-r3	All supported architectures

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.

Workaround

There is no known workaround at this time.

Resolution

All Hylafax users should upgrade to the latest version:

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

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200509-21.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 https://bugs.gentoo.org.