GLSA 200704-18: Courier-IMAP: Remote execution of arbitrary code

http://security.gentoo.org/

Severity:	high
Title:	Courier-IMAP: Remote execution of arbitrary code
Date:	04/22/2007
Bugs:	#168196
ID:	200704-18

Synopsis

A vulnerability has been discovered in Courier-IMAP allowing for remote code execution with root privileges.

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	Architecture(s)
net-mail/courier-imap	< 4.0.6-r2	>= 4.0.6-r2	All supported architectures

Description

CJ Kucera has discovered that some Courier-IMAP scripts don't properly handle the XMAILDIR variable, allowing for shell command injection.

Impact

A remote attacker could send specially crafted login credentials to a Courier-IMAP server instance, possibly leading to remote code execution with root privileges.

Workaround

There is no known workaround at this time.

Resolution

All Courier-IMAP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-mail/courier-imap-4.0.6-r2"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200704-18.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 https://bugs.gentoo.org.