CVE-2009-0580

Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through
6.0.18, when FORM authentication is used, allows remote attackers to
enumerate valid usernames via requests to /j_security_check with malformed
URL encoding of passwords, related to improper error checking in the (1)
MemoryRealm, (2) DataSourceRealm, and (3) JDBCRealm authentication realms,
as demonstrated by a % (percent) value for the j_password parameter.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=532362&gt;
• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=532363&gt;
• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=532366&gt;

Notes