GLSA 200512-18: XnView: Privilege escalation

http://security.gentoo.org/

Severity:	normal
Title:	XnView: Privilege escalation
Date:	12/30/2005
Bugs:	#117063
ID:	200512-18

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	Architecture(s)
x11-misc/xnview	< 1.70-r1	>= 1.70-r1	x86

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 ">=x11-misc/xnview-1.70-r1"

References

CVE-2005-4595

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 https://bugs.gentoo.org.