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CVE-2010-1885

HighPublished

The MPC::HexToNum function in helpctr.exe in Microsoft Windows Help and Support Center in Windows XP and Windows Server 2003 does not properly handle...

Published: Jun 14, 2010
Updated: Aug 7, 2024
Assigning CNA: microsoft
Evidence observed: Jun 10, 2010

Primary CVSS

9.3/ 10High

nvd · CVSS 2.0

AV:N/AC:M/Au:N/C:C/I:C/A:C

EPSS probability estimate

71.2%

High · next 30 days

Percentile: 99.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The MPC::HexToNum function in helpctr.exe in Microsoft Windows Help and Support Center in Windows XP and Windows Server 2003 does not properly handle malformed escape sequences, which allows remote attackers to bypass the trusted documents whitelist (fromHCP option) and execute arbitrary commands via a crafted hcp:// URL, aka "Help Center URL Validation Vulnerability."

Sources

Microsoft Windows Help Centre Handles - Malformed Escape Sequences Incorrectly (MS03-044)Exploit
Tavis Ormandy · windows · Jun 10, 2010
Microsoft Help Center - Cross-Site Scripting / Command Execution (MS10-042) (Metasploit)Exploit
Metasploit · windows · Sep 20, 2010

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