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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
courier-imap: Remote Format String Vulnerability
Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200408-19
(courier-imap: Remote Format String Vulnerability)
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.
If DEBUG_LOGIN is enabled in the imapd configuration, a remote attacker may
execute arbitrary code as the root user.
Set the DEBUG_LOGIN option in /etc/courier-imap/imapd to 0. (This is the
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"
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: (C) 2005 Michel Arboi
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