- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200909-15 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: Lynx: Arbitrary command execution Date: September 12, 2009 Bugs: #243058 ID: 200909-15 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== An incomplete fix for an issue related to the Lynx URL handler might allow for the remote execution of arbitrary commands. Background ========== Lynx is a fully-featured WWW client for users running cursor-addressable, character-cell display devices such as vt100 terminals and terminal emulators. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 www-client/lynx < 2.8.6-r4 >= 2.8.6-r4 Description =========== Clint Ruoho reported that the fix for CVE-2005-2929 (GLSA 200511-09) only disabled the lynxcgi:// handler when not using the advanced mode. Impact ====== A remote attacker can entice a user to access a malicious HTTP server, causing Lynx to execute arbitrary commands. NOTE: The advanced mode is not enabled by default. Successful exploitation requires the "lynxcgi://" protocol to be registered with lynx on the victim's system. Workaround ========== There is no known workaround at this time. Resolution ========== All Lynx users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose =www-client/lynx-2.8.6-r4 References ========== [ 1 ] CVE-2005-2929 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2929 [ 2 ] CVE-2008-4690 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4690 [ 3 ] GLSA 200511-09 http://www.gentoo.org/security/en/glsa/glsa-200511-09.xml Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200909-15.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. 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