65264 : Microsoft Windows hcp:// Protocol Handler MPC::HexToNum() Function String Miscalculation Arbitrary Command Execution
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Views This Week Views All Time Added to OSVDB Last Modified Modified (since 2008) Percent Complete
5 5689 almost 4 years ago about 3 years ago 36 times 100%


Disclosure Date
Time to Patch Days of Exposure
38 days 33 days


Microsoft Windows contains a flaw related to the 'MPC::HexToNum()' function in 'helpctr.exe' failing to properly handle escape sequences. This may allow a remote attacker to bypass the trusted documents whitelist and execute arbitrary commands via a crafted hcp:// URL directed to the sysinfomain.htm help document.


Location: Local / Remote, Context Dependent
Attack Type: Input Manipulation
Impact: Loss of Integrity
Solution: Patch / RCS, Third-Party Solution
Exploit: Exploit Public, Exploit Commercial
Disclosure: Vendor Verified, Uncoordinated Disclosure


Currently, there are no known workarounds or upgrades to correct this issue. However, Microsoft has released a patch to address this vulnerability.


Microsoft Corporation
Windows XP
Professional x64 Edition SP2


Tools & Filters




CVSSv2 Score

CVSSv2 Base Score = 9.3
Source: nvd.nist.gov | Generated: 2010-06-15 | Disagree?

Access_vector_2 Access_complexity_1 Authentication_2 Confidentiality_impact_2 Integrity_impact_2 Availability_impact_2


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