- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200512-18 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: XnView: Privilege escalation Date: December 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 ------------------------------------------------------------------- 1 x11-misc/xnview < 1.70-r1 >= 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 ">=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