| 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.
|