GLSA 200512-18 XnView: Privilege escalation
Posted on: 12/30/2005 03:12 PM

A new security update has been released for Gentoo Linux - XnView: Privilege escalation. Here the announcement:

Gentoo Linux Security Advisory GLSA 200512-18
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http://security.gentoo.org/
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Severity: Normal
Title: XnView: Privilege escalation
Date: December 30, 2005
Bugs: #117063
ID: 200512-18

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Synopsis
========

XnView may search for shared libraries in an untrusted location,
potentially allowing local users to execute arbitrary code with the
privileges of another user.

Background
==========

XnView is an efficient multimedia viewer, browser and converter,
distributed free for non-commercial use.

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 x11-misc/xnview lt; 1.70-r1 gt;= 1.70-r1
-------------------------------------------------------------------
# Package 1 only applies to x86 users.

Description
===========

Krzysiek Pawlik of Gentoo Linux discovered that the XnView package for
IA32 used the DT_RPATH field insecurely, causing the dynamic loader to
search for shared libraries in potentially untrusted directories.

Impact
======

A local attacker could create a malicious shared object that would be
loaded and executed when a user attempted to use an XnView utility.
This would allow a malicious user to effectively hijack XnView and
execute arbitrary code with the privileges of the user running the
program.

Workaround
==========

The system administrator may use the chrpath utility to remove the
DT_RPATH field from the XnView utilities:

# emerge app-admin/chrpath
# chrpath --delete /opt/bin/nconvert /opt/bin/nview /opt/bin/xnview

Resolution
==========

All XnView users on the x86 platform should upgrade to the latest
version:

# emerge --sync
# emerge --ask --oneshot --verbose "gt;=x11-misc/xnview-1.70-r1"

Availability
============

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

http://security.gentoo.org/glsa/glsa-200512-18.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
http://bugs.gentoo.org.

License
=======

Copyright 2005 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/2.0



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