full-disclosure - [MU-200604-01] Cyrus SASL DIGEST-MD5 Pre-Authentication Denial of Service

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Message-ID: <20060410180541.0EA3CAB@lists.grok.org.uk>
Date: Mon Apr 10 19:15:55 2006
From: noreply at musecurity.com (noreply@...ecurity.com)
Subject: [MU-200604-01] Cyrus SASL DIGEST-MD5
	Pre-Authentication Denial of Service

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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.

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