The balancer_handler function in mod_proxy_balancer in the Apache HTTP Server 2.2.0 through 2.2.6, when a threaded Multi-Processing Module is used, allows remote authenticated users to cause a denial of service (child process crash) via an invalid bb variable.
https://www.redhat.com/archives/fedora-package-announce/2008-February/msg00562.html
https://www.redhat.com/archives/fedora-package-announce/2008-February/msg00541.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8690
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10181
https://exchange.xforce.ibmcloud.com/vulnerabilities/39476
http://www.vupen.com/english/advisories/2008/0048
http://www.ubuntu.com/usn/usn-575-1
http://www.securityfocus.com/bid/27236
http://www.securityfocus.com/archive/1/486169/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2008-0009.html
http://www.redhat.com/support/errata/RHSA-2008-0008.html
http://www.mandriva.com/security/advisories?name=MDVSA-2008:016
http://securityreason.com/securityalert/3523
http://security.gentoo.org/glsa/glsa-200803-19.xml
http://secunia.com/advisories/29640
http://secunia.com/advisories/29348
http://secunia.com/advisories/28977
http://secunia.com/advisories/28749
http://secunia.com/advisories/28526
http://lists.opensuse.org/opensuse-security-announce/2008-04/msg00004.html