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Category:   Application (Web Server/CGI)  >   Apache Tomcat Vendors:   Apache Software Foundation
Tomcat Authentication Response Error Lets Remote Users Determine Valid Usernames
SecurityTracker Alert ID:  1022332
SecurityTracker URL:  http://securitytracker.com/id/1022332
CVE Reference:   CVE-2009-0580   (Links to External Site)
Date:  Jun 4 2009
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 4.1.0 to 4.1.39, 5.5.0 to 5.5.27, 6.0.0 to 6.0.18
Description:   A vulnerability was reported in Apache Tomcat. A remote user can determine valid usernames on the target system.

In certain configurations, a remote user can send specially encoded password values to determine if the specified username exists on the target system.

Systems using form-based authentication (j_security_check) with one of the following
authentication realms are affected:

MemoryRealm
DataSourceRealm
JDBCRealm

D. Matscheko and T. Hackner of SEC Consult reported this vulnerability.

Impact:   A remote user can determine valid usernames on the target system.
Solution:   The vendor has issued a fix (6.0.20). The fix will be included in future versions 4.1.40 and 5.5.28.
Vendor URL:  tomcat.apache.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jul 6 2009 (Red Hat Issues Fix for JBoss) Tomcat Authentication Response Error Lets Remote Users Determine Valid Usernames
Red Hat has released a fix for JBoss Enterprise Application Platform (JBEAP) 4.2 for Red Hat Enterprise Linux 5.
Sep 21 2009 (Red Hat Issues Fix for JBoss) Tomcat Authentication Response Error Lets Remote Users Determine Valid Usernames
Red Hat has released a fix for JBoss Enterprise Web Server 1.0.0 for Red Hat Enterprise Linux 4 and 5.
Oct 14 2009 (Red Hat Issues Fix for JBoss) Tomcat Authentication Response Error Lets Remote Users Determine Valid Usernames
Red Hat has released a fix for Tomcat6 for JBoss Enterprise Web Server 1.0.0 for Red Hat Enterprise Linux 4 and 5.
Nov 10 2009 (Red Hat Issues Fix) Tomcat Authentication Response Error Lets Remote Users Determine Valid Usernames
Red Hat has issued a fix for Red Hat Application Server v2.
Dec 1 2009 (Red Hat Issues Fix for Red Hat Network Satellite Server) Tomcat Authentication Response Error Lets Remote Users Determine Valid Usernames
Red Hat has issued a fix for Red Hat Network Satellite Server 5.2 and 5.3.
Nov 24 2010 (HP Issues Fix for HP-UX) Tomcat Authentication Response Error Lets Remote Users Determine Valid Usernames
HP has issued a fix for HP-UX 11.23 and 11.31.



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