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Gentoo Linux Security Advisory GLSA 200408-19 |
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http://security.gentoo.org/ |
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|
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Severity: High |
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Title: courier-imap: Remote Format String Vulnerability |
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Date: August 19, 2004 |
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Bugs: #60865 |
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ID: 200408-19 |
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|
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Synopsis |
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======== |
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|
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There is a format string vulnerability in non-standard configurations |
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of courier-imapd which may be exploited remotely. An attacker may be |
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able to execute arbitrary code as the user running courier-imapd |
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(oftentimes root). |
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|
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Background |
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========== |
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|
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Courier-IMAP is an IMAP server which is part of the Courier mail |
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system. It provides access only to maildirs. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-mail/courier-imap <= 3.0.2-r1 >= 3.0.5 |
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|
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Description |
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=========== |
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|
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There is a format string vulnerability in the auth_debug() function |
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which can be exploited remotely, potentially leading to arbitrary code |
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execution as the user running the IMAP daemon (oftentimes root). A |
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remote attacker may send username or password information containing |
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printf() format tokens (such as "%s"), which will crash the server or |
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cause it to execute arbitrary code. |
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|
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This vulnerability can only be exploited if DEBUG_LOGIN is set to |
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something other than 0 in the imapd config file. |
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|
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Impact |
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====== |
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|
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If DEBUG_LOGIN is enabled in the imapd configuration, a remote attacker |
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may execute arbitrary code as the root user. |
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|
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Workaround |
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========== |
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|
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Set the DEBUG_LOGIN option in /etc/courier-imap/imapd to 0. (This is |
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the default value.) |
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|
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Resolution |
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========== |
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|
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All courier-imap users should upgrade to the latest version: |
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|
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# emerge sync |
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|
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# emerge -pv ">=net-mail/courier-imap-3.0.5" |
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# emerge ">=net-mail/courier-imap-3.0.5" |
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|
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References |
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========== |
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|
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[ 1 ] iDEFENSE Advisory |
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http://www.idefense.com/application/poi/display?id=131&type=vulnerabilities&flashstatus=true |
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|
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Availability |
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============ |
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|
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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|
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http://security.gentoo.org/glsa/glsa-200408-19.xml |
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|
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Concerns? |
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========= |
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|
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2004 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/1.0 |