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Category:   Application (Web Server/CGI)  >   Apache Tomcat Vendors:   Apache Software Foundation
Apache Tomcat HTTP DIGEST Authentication Weaknesses Let Remote Users Conduct Bypass Attacks
SecurityTracker Alert ID:  1026095
SecurityTracker URL:  http://securitytracker.com/id/1026095
CVE Reference:   CVE-2011-1184   (Links to External Site)
Date:  Sep 26 2011
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.5.0 to 5.5.33, 6.0.0 to 6.0.32, 7.0.0 to 7.0.11
Description:   A vulnerability was reported in Apache Tomcat. A remote user can conduct authentication bypass attacks.

The HTTP DIGEST authentication implementation does not validate certain security parameters (server nonces, client nonce counts, qop values, realm values) and does not prevent replay attacks. In addition, the server secret value is hard-coded to a known value.

Impact:   A remote user can conduct authentication bypass attacks.
Solution:   The vendor has issued a fix (5.5.34, 6.0.33, 7.0.12).
Vendor URL:  tomcat.apache.org/ (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Dec 21 2011 (Red Hat Issues Fix) Apache Tomcat HTTP DIGEST Authentication Weaknesses Let Remote Users Conduct Bypass Attacks
Red Hat has issued a fix for Red Hat Enterprise Linux 5.



 Source Message Contents

Subject:  [Full-disclosure] [SECURITY] CVE-2011-1184 Apache Tomcat - Multiple weaknesses in HTTP DIGEST authentication

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CVE-2011-1184 Apache Tomcat - Multiple weaknesses in HTTP DIGEST
authentication

Severity: Moderate

Vendor: The Apache Software Foundation

Versions Affected:
- - Tomcat 7.0.0 to 7.0.11
- - Tomcat 6.0.0 to 6.0.32
- - Tomcat 5.5.0 to 5.5.33
- - Earlier, unsupported versions may also be affected

Description:
The implementation of HTTP DIGEST authentication was discovered to
have several weaknesses:
- - replay attacks were permitted
- - server nonces were not checked
- - client nonce counts were not checked
- - qop values were not checked
- - realm values were not checked
- - the server secret was hard-coded to a known string
The result of these weaknesses is that DIGEST authentication was only
as secure as BASIC authentication.

Mitigation:
Users of Tomcat 7.0.x should upgrade to 7.0.12 or later
Users of Tomcat 6.0.x should upgrade to 6.0.33 or later
Users of Tomcat 5.5.x should upgrade to 5.5.34 or later

Credit:
This issue was identified by the Apache Tomcat security team

References:
http://tomcat.apache.org/security.html
http://tomcat.apache.org/security-7.html
http://tomcat.apache.org/security-6.html
http://tomcat.apache.org/security-5.html
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