http_protocol.c in (1) IBM HTTP Server 6.0 before 6.0.2.13 and 6.1 before 6.1.0.1, and (2) Apache HTTP Server 1.3 before 1.3.35, 2.0 before 2.0.58, and 2.2 before 2.2.2, does not sanitize the Expect header from an HTTP request when it is reflected back in an error message, which might allow cross-site scripting (XSS) style attacks using web client components that can send arbitrary headers in requests, as demonstrated using a Flash SWF file.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12238
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10352
http://www.vupen.com/english/advisories/2010/1572
http://www.vupen.com/english/advisories/2006/5089
http://www.vupen.com/english/advisories/2006/4207
http://www.vupen.com/english/advisories/2006/3264
http://www.vupen.com/english/advisories/2006/2964
http://www.vupen.com/english/advisories/2006/2963
http://www.ubuntu.com/usn/usn-575-1
http://www.securityfocus.com/bid/19661
http://www.redhat.com/support/errata/RHSA-2006-0619.html
http://www.novell.com/linux/security/advisories/2006_51_apache.html
http://www.f-secure.com/en_EMEA/support/security-advisory/fsc-2010-2.html
http://www.debian.org/security/2006/dsa-1167
http://www-1.ibm.com/support/docview.wss?uid=swg24013080
http://www-1.ibm.com/support/docview.wss?uid=swg1PK24631
http://support.avaya.com/elmodocs2/security/ASA-2006-194.htm
http://secunia.com/advisories/40256
http://secunia.com/advisories/29640
http://secunia.com/advisories/28749
http://secunia.com/advisories/22523
http://secunia.com/advisories/22317
http://secunia.com/advisories/22140
http://secunia.com/advisories/21986
http://secunia.com/advisories/21848
http://secunia.com/advisories/21744
http://secunia.com/advisories/21598
http://secunia.com/advisories/21478
http://secunia.com/advisories/21399
http://secunia.com/advisories/21174
http://secunia.com/advisories/21172
http://rhn.redhat.com/errata/RHSA-2006-0692.html
http://rhn.redhat.com/errata/RHSA-2006-0618.html
http://openbsd.org/errata.html#httpd2
http://marc.info/?l=bugtraq&m=130497311408250&w=2
http://marc.info/?l=bugtraq&m=129190899612998&w=2
http://marc.info/?l=bugtraq&m=125631037611762&w=2
http://lists.opensuse.org/opensuse-security-announce/2008-04/msg00004.html
http://kb.vmware.com/KanisaPlatform/Publishing/466/5915871_f.SAL_Public.html