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[ GLSA 200408-19 ] courier-imap: Remote Format String Vulnerability
From: "Joshua J. Berry" <condordes () gentoo org>
Date: Thu, 19 Aug 2004 16:22:55 -0700
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 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
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- [ GLSA 200408-19 ] courier-imap: Remote Format String Vulnerability Joshua J. Berry (Aug 19)