Integer overflow in Microsoft Windows 98, 2000, XP SP2 and earlier, and Server 2003 SP1 and earlier allows remote attackers to execute arbitrary code via a crafted compiled Help (.CHM) file with a large size field that triggers a heap-based buffer overflow, as demonstrated using a "ms-its:" URL in Internet Explorer.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A463
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A381
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1057
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-026
http://www.us-cert.gov/cas/techalerts/TA05-165A.html
http://www.securityfocus.com/bid/13953
http://www.kb.cert.org/vuls/id/851869
http://secunia.com/advisories/15683
http://archives.neohapsis.com/archives/vulnwatch/2005-q2/0062.html