[ GLSA 200804-09 ] am-utils: Insecure temporary file creation

2008-04-1400:00:00

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Gentoo Linux Security Advisory GLSA 200804-09

                                        http://security.gentoo.org/

Severity: Normal
Title: am-utils: Insecure temporary file creation
Date: April 10, 2008
Bugs: #210158
ID: 200804-09

Synopsis

am-utils creates temporary files insecurely allowing local users to
overwrite arbitrary files via a symlink attack.

Background

am-utils is a collection of utilities for use with the Berkeley
Automounter.

Affected packages

-------------------------------------------------------------------
 Package          /  Vulnerable  /                      Unaffected
-------------------------------------------------------------------

1 net-fs/am-utils < 6.1.5 >= 6.1.5

Description

Tavis Ormandy discovered that, when creating temporary files, the
'expn' utility does not check whether the file already exists.

Impact

A local attacker could exploit the vulnerability via a symlink attack
to overwrite arbitrary files.

Workaround

There is no known workaround at this time.

Resolution

All am-utils users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=net-fs/am-utils-6.1.5&quot;

References

[ 1 ] CVE-2008-1078
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1078

Availability

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

http://security.gentoo.org/glsa/glsa-200804-09.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
[email protected] or alternatively, you may file a bug at
http://bugs.gentoo.org.