From condordes@gentoo.org Fri Aug 20 17:40:20 2004 From: Joshua J. Berry To: gentoo-announce@lists.gentoo.org Cc: bugtraq@securityfocus.com, full-disclosure@lists.netsys.com, security-alerts@linuxsecurity.com Date: Thu, 19 Aug 2004 16:22:55 -0700 Subject: [Full-Disclosure] [gentoo-announce] [ GLSA 200408-19 ] courier-imap: Remote Format String Vulnerability - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200408-19 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: courier-imap: Remote Format String Vulnerability Date: August 19, 2004 Bugs: #60865 ID: 200408-19 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== There is a format string vulnerability in non-standard configurations of courier-imapd which may be exploited remotely. An attacker may be able to execute arbitrary code as the user running courier-imapd (oftentimes root). Background ========== Courier-IMAP is an IMAP server which is part of the Courier mail system. It provides access only to maildirs. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-mail/courier-imap <= 3.0.2-r1 >= 3.0.5 Description =========== There is a format string vulnerability in the auth_debug() function which can be exploited remotely, potentially leading to arbitrary code execution as the user running the IMAP daemon (oftentimes root). A remote attacker may send username or password information containing printf() format tokens (such as "%s"), which will crash the server or cause it to execute arbitrary code. This vulnerability can only be exploited if DEBUG_LOGIN is set to something other than 0 in the imapd config file. Impact ====== If DEBUG_LOGIN is enabled in the imapd configuration, a remote attacker may execute arbitrary code as the root user. Workaround ========== Set the DEBUG_LOGIN option in /etc/courier-imap/imapd to 0. (This is the default value.) Resolution ========== All courier-imap users should upgrade to the latest version: # emerge sync # emerge -pv ">=net-mail/courier-imap-3.0.5" # emerge ">=net-mail/courier-imap-3.0.5" References ========== [ 1 ] iDEFENSE Advisory http://www.idefense.com/application/poi/display?id=131&type=vulnerabilities&flashstatus=true Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200408-19.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 2004 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/1.0 [ Part 2, Application/PGP-SIGNATURE 196bytes. ] [ Unable to print this part. ]