[gentoo-announce] [ GLSA 200903-24 ] Shadow: Privilege escalation

[news 28]

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Gentoo Linux Security Advisory GLSA 200903-24

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

http://security.gentoo.org/

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 

Severity: High

Title: Shadow: Privilege escalation

Date: March 10, 2009

Bugs: #251320

ID: 200903-24

 

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 

Synopsis

========

 

An insecure temporary file usage in Shadow may allow local users to

gain root privileges.

 

Background

==========

 

Shadow is a set of tools to deal with user accounts.

 

Affected packages

=================

 

-------------------------------------------------------------------

Package / Vulnerable / Unaffected

-------------------------------------------------------------------

1 sys-apps/shadow < 4.1.2.2 >= 4.1.2.2

 

Description

===========

 

Paul Szabo reported a race condition in the "login" executable when

setting up tty permissions.

 

Impact

======

 

A local attacker belonging to the "utmp" group could use symlink

attacks to overwrite arbitrary files and possibly gain root privileges.

 

Workaround

==========

 

There is no known workaround at this time.

 

Resolution

==========

 

All Shadow users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=sys-apps/shadow-4.1.2.2"

 

References

==========

 

[ 1 ] CVE-2008-5394

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5394

 

Availability

============

 

This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:

 

http://security.gentoo.org/glsa/glsa-200903-24.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 ( -at -) gentoo.org or alternatively, you may file a bug at

http://bugs.gentoo.org.

 

License

=======

 

Copyright 2009 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