A vulnerability has been discovered in Courier-IMAP allowing for remote code execution with root privileges.
|Package||net-mail/courier-imap on all architectures|
|Affected versions||< 4.0.6-r2|
|Unaffected versions||>= 4.0.6-r2, < 4.0.0|
Courier-IMAP is an IMAP server which is part of the Courier mail system. It provides access only to maildirs.
CJ Kucera has discovered that some Courier-IMAP scripts don't properly handle the XMAILDIR variable, allowing for shell command injection.
A remote attacker could send specially crafted login credentials to a Courier-IMAP server instance, possibly leading to remote code execution with root privileges.
There is no known workaround at this time.
All Courier-IMAP users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-mail/courier-imap-4.0.6-r2"
April 22, 2007
April 23, 2007: 02