UW IMAP: CRAM-MD5 authentication bypass

1. Gentoo Linux Security Advisory

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-mail/uw-imap	<= 2004a	>= 2004b	All supported architectures

Related bugreports: #79874

UW IMAP contains a vulnerability in the code handling CRAM-MD5 authentication allowing authentication bypass.

2. Impact Information

UW IMAP is the University of Washington IMAP toolkit which includes POP3 and IMAP daemons.

A logic bug in the code handling CRAM-MD5 authentication incorrectly specifies the condition for successful authentication.

An attacker could exploit this vulnerability to authenticate as any mail user on a server with CRAM-MD5 authentication enabled.

3. Resolution Information

Disable CRAM-MD5 authentication.

All UW IMAP users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-mail/uw-imap-2004b"

4. References

Updated February 02, 2005

Summary: This is a Gentoo Linux Security Advisory

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