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[MU-200604-01] Cyrus SASL DIGEST-MD5 Pre-Authentication Denial of Service
From: noreply () musecurity com
Date: Mon, 10 Apr 2006 19:05:41 +0100 (BST)

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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

Mu Security is an early-stage innovator creating a new class of security
analysis system. The company's mission is to widely deploy security analysis
and reduce product and application vulnerabilities.  Mu's founders include
industry-recognized  experts in the IDP, open source protocol analysis tools,
ethical hacking, and network management markets. The security analysis process
and product solution provide a rigorous and streamlined methodology for
verifying and improving the security readiness of any IP-based product or
application.  Mu Security, headquartered in Sunnyvale, California, is backed
by preeminent venture capital firms including Accel Partners and Benchmark
Capital.

The information within this paper may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There are no
warranties, implied or express, with regard to this information. In no event
shall the author be liable for any direct or indirect damages whatsoever
arising out of or in connection with the use or spread of this information.
Any use of this information is at the user's own risk.

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