Courier-IMAP: Remote execution of arbitrary code
Gentoo Linux Security Advisory
||GLSA 200704-18 / courier-imap
||April 22, 2007
||April 23, 2007: 02
All supported architectures
A vulnerability has been discovered in Courier-IMAP allowing for remote
code execution with root privileges.
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:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-mail/courier-imap-4.0.6-r2"