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Category:   Application (Security)  >   Cyrus SASL Vendors:   Carnegie Mellon University
Cyrus SASL DIGEST-MD5 Negotiation Flaw Lets Remote Users Deny Service
SecurityTracker Alert ID:  1016960
SecurityTracker URL:  http://securitytracker.com/id/1016960
CVE Reference:   CVE-2006-1721   (Links to External Site)
Date:  Oct 2 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.1.20 and prior versions
Description:   A vulnerability was reported in Cyrus SASL. A remote user can cause denial of service conditions.

A remote user can send a specially crafted realm header during DIGEST-MD5 negotiation to trigger a segmentation fault and cause the target application to crash. Applications that use the SASL library to perform SASL DIGEST-MD5 authentication are affected.

This vulnerability was discovered by the Mu Security research team.

The original advisory is available at:

http://labs.musecurity.com/advisories/MU-200604-01.txt

Impact:   A remote user can cause denial of service conditions.
Solution:   The vendor has issued a fixed version (2.1.21 or later), available at:

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

Vendor URL:  asg.web.cmu.edu/sasl/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Oct 2 2006 (Apple Issues Fix) Cyrus SASL DIGEST-MD5 Negotiation Flaw Lets Remote Users Deny Service
Apple has released a fix for Mac OS X.
Sep 4 2007 (Red Hat Issues Fix) Cyrus SASL DIGEST-MD5 Negotiation Flaw Lets Remote Users Deny Service
Red Hat has released a fix for Red Hat Enterprise Linux 3.
Sep 4 2007 (Red Hat Issues Fix) Cyrus SASL DIGEST-MD5 Negotiation Flaw Lets Remote Users Deny Service
Red Hat has released a fix for Red Hat Enterprise Linux 4.



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