The MHTML protocol handler in a component of Microsoft Outlook Express 5.5 SP2 and 6 through SP1, and Windows Mail, does not assign the correct Internet Explorer Security Zone to UNC share pathnames, which allows remote attackers to bypass intended access restrictions and read arbitrary files via an mhtml: URI in conjunction with a redirection, aka "URL Parsing Cross-Domain Information Disclosure Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5886
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2008/ms08-048
http://www.vupen.com/english/advisories/2008/2352
http://www.us-cert.gov/cas/techalerts/TA08-225A.html
http://www.securitytracker.com/id?1020680
http://www.securitytracker.com/id?1020679
http://www.securityfocus.com/bid/30585
http://www.securityfocus.com/archive/1/495458/100/0/threaded
http://www.coresecurity.com/content/internet-explorer-zone-elevation