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.
exchange.xforce.ibmcloud.com/vulnerabilities/50930
github.com/apache/tomcat
lists.apache.org/thread.html/06cfb634bc7bf37af7d8f760f118018746ad8efbd519c4b789ac9c2e%40%3Cdev.tomcat.apache.org%3E
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lists.apache.org/thread.html/r584a714f141eff7b1c358d4679288177bd4ca4558e9999d15867d4b5%40%3Cdev.tomcat.apache.org%3E
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lists.apache.org/thread.html/rb71997f506c6cc8b530dd845c084995a9878098846c7b4eacfae8db3%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/rb71997f506c6cc8b530dd845c084995a9878098846c7b4eacfae8db3@%3Cdev.tomcat.apache.org%3E
lists.apple.com/archives/security-announce/2010//Mar/msg00001.html
lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html
marc.info/?l=bugtraq&m=127420533226623&w=2
marc.info/?l=bugtraq&m=129070310906557&w=2
marc.info/?l=bugtraq&m=133469267822771&w=2
marc.info/?l=bugtraq&m=136485229118404&w=2
nvd.nist.gov/vuln/detail/CVE-2009-0580
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18915
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6628
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9101
svn.apache.org/viewvc?rev=747840&view=rev
svn.apache.org/viewvc?rev=781379&view=rev
svn.apache.org/viewvc?rev=781382&view=rev
tomcat.apache.org/security-4.html
tomcat.apache.org/security-5.html
tomcat.apache.org/security-6.html
www.debian.org/security/2011/dsa-2207
www.redhat.com/archives/fedora-package-announce/2009-November/msg01156.html
www.redhat.com/archives/fedora-package-announce/2009-November/msg01216.html
www.redhat.com/archives/fedora-package-announce/2009-November/msg01246.html