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Cyrus SASL DIGEST-MD5 Pre-Authentication Denial of Service [MU-200604-01]
April 7, 2006

http://labs.musecurity.com/advisories.html

Affected Product/Versions:

cyrus-sasl-2.1.18

Product Overview:

SASL (Simple Authentication Security Layer) is an Internet standards-track
method for remote computers to authenticate. The Cyrus SASL library makes
supporting various SASL mechanisms easy for both client and server writers.

Vulnerability Details:

A denial of service condition exists in the SASL authentication library during
DIGEST-MD5 negotiation. This potentially affects multiple products that use
SASL DIGEST-MD5 authentication including OpenLDAP, Sendmail, Postfix, Apple,
etc.

Vendor Response / Solution:

All users of this authentication library are recommended to upgrade to 2.1.21
which fixes these problems.

Hotfix solution to this advisory:

ftp://ftp.andrew.cmu.edu/pub/cyrus-mail/cyrus-sasl-2.1.21.tar.gz

Mu Security would like to thank the SASL team in advance for timely
remediation of these vulnerabilities.

Credit:

This vulnerability was discovered by the Mu Security research team.

http://labs.musecurity.com/pgpkey.txt

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