Heap-based buffer overflow in the HtmlHelp program (hh.exe) in HTML Help for Microsoft Windows 98, Me, NT 4.0, 2000, XP, and Server 2003 allows remote attackers to execute arbitrary commands via a .CHM file with a large length field, a different vulnerability than CVE-2003-1041.

The showHelp function in Internet Explorer 6 on Windows XP Pro allows remote attackers to execute arbitrary local .CHM files via a double backward slash ("\\") before the target CHM file, as demonstrated using an "ms-its" URL to ntshared.chm. NOTE: this bug may overlap CVE-2003-1041.

Internet Explorer 5.x and 6.0 allows remote attackers to execute arbitrary programs via a modified directory traversal attack using a URL containing ".." (dot dot) sequences and a filename that ends in "::" which is treated as a .chm file even if it does not have a .chm extension. NOTE: this bug may overlap CVE-2004-0475.