Joined: 12 May 2004
|Posted: Fri Dec 30, 2005 1:26 pm Post subject: [ GLSA 200512-18 ] XnView: Privilege escalation
|Gentoo Linux Security Advisory
Title: XnView: Privilege escalation (GLSA 200512-18)
Date: December 30, 2005
Updated: May 22, 2006
XnView may search for shared libraries in an untrusted location, potentially allowing local users to execute arbitrary code with the privileges of another user.
XnView is an efficient multimedia viewer, browser and converter, distributed free for non-commercial use.
Vulnerable: < 1.70-r1
Unaffected: >= 1.70-r1
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.
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.
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
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"
Last edited by GLSA on Mon May 22, 2006 4:19 am; edited 2 times in total