The GENERATE_SEED macro in PHP 4.x before 4.4.8 and 5.x before 5.2.5, when running on 64-bit systems, performs a multiplication that generates a portion of zero bits during conversion due to insufficient precision, which produces 24 bits of entropy and simplifies brute force attacks against protection mechanisms that use the rand and mt_rand functions.
archives.neohapsis.com/archives/fulldisclosure/2008-05/0103.html
secunia.com/advisories/30757
secunia.com/advisories/30828
secunia.com/advisories/31119
secunia.com/advisories/31124
secunia.com/advisories/31200
secunia.com/advisories/32746
secunia.com/advisories/35003
security.gentoo.org/glsa/glsa-200811-05.xml
securityreason.com/securityalert/3859
www.debian.org/security/2009/dsa-1789
www.mandriva.com/security/advisories?name=MDVSA-2008:125
www.mandriva.com/security/advisories?name=MDVSA-2008:126
www.mandriva.com/security/advisories?name=MDVSA-2008:127
www.mandriva.com/security/advisories?name=MDVSA-2008:128
www.mandriva.com/security/advisories?name=MDVSA-2008:129
www.mandriva.com/security/advisories?name=MDVSA-2008:130
www.redhat.com/support/errata/RHSA-2008-0505.html
www.redhat.com/support/errata/RHSA-2008-0544.html
www.redhat.com/support/errata/RHSA-2008-0545.html
www.redhat.com/support/errata/RHSA-2008-0546.html
www.redhat.com/support/errata/RHSA-2008-0582.html
www.securityfocus.com/archive/1/491683/100/0/threaded
www.sektioneins.de/advisories/SE-2008-02.txt
www.ubuntu.com/usn/usn-628-1
exchange.xforce.ibmcloud.com/vulnerabilities/42226
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10844
www.redhat.com/archives/fedora-package-announce/2008-June/msg00773.html
www.redhat.com/archives/fedora-package-announce/2008-June/msg00779.html