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.
|
Source Message Contents
|
Date: Sun, 1 Oct 2006 22:23:05 -0400
Subject: http://labs.musecurity.com/advisories/MU-200604-01.txt
|
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2.2 (Darwin)
iD8DBQFEOptFMl+docYeP+YRAtF3AJ4lonQmv4AafPOU1+890u/o+oiD5wCgh7iw
HcT0MJfwuxFzv5DFqU64zoA=
=plHS
-----END PGP SIGNATURE-----
|
|
