php_variables.c in PHP before 5.0.2 allows remote attackers to read sensitive memory contents via (1) GET, (2) POST, or (3) COOKIE GPC variables that end in an open bracket character, which causes PHP to calculate an incorrect string length.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10863
https://exchange.xforce.ibmcloud.com/vulnerabilities/17393
https://bugzilla.fedora.us/show_bug.cgi?id=2344
http://www.redhat.com/support/errata/RHSA-2004-687.html
http://securitytracker.com/id?1011279
http://secunia.com/advisories/12560/
http://marc.info/?l=bugtraq&m=109527531130492&w=2
http://archives.neohapsis.com/archives/vulnwatch/2004-q3/0053.html