Microsoft Windows Me HSC hcp:// buffer overflow

winme-hsc-hcp-bo (11425) The risk level is classified as HighHigh Risk


Microsoft Windows Me is vulnerable to a buffer overflow in the Help and Support Center (HSC) feature, caused by improper bounds checking of hcp:// URLs by the HSC URL handler. By creating a specially-crafted hcp:// URL, a remote attacker could overflow a buffer and execute arbitrary code on the victim's computer with full system privileges, once the URL is invoked. An attacker could exploit this vulnerability by creating a malicious Web page and hosting it on a Web site or sending it to a victim as an HTML email.


Gain Privileges


Apply the patch for this vulnerability, as listed in Microsoft Security Bulletin MS03-006. See References.


  • BugTraq Mailing List, 2003-02-27 5:06:08: MS-Windows ME IE/Outlook/HelpCenter critical vulnerability.
  • CIAC Information Bulletin N-047: Microsoft Windows ME Help and Support Center Vulnerability.
  • Microsoft Security Bulletin MS03-006: Flaw in Windows Me Help and Support Center Could Enable Code Execution (812709).
  • BID-6966: Microsoft Windows Help and Support Center Buffer Overflow Vulnerability
  • CVE-2003-0009: Cross-site scripting (XSS) vulnerability in Help and Support Center for Microsoft Windows Me allows remote attackers to execute arbitrary script in the Local Computer security context via an hcp:// URL with the malicious script in the topic parameter.
  • OSVDB ID: 6074: Microsoft Windows Me HSC hcp:// URL XSS
  • US-CERT VU#489721: Microsoft Windows Me and XP Help and Support Center does not adequately validate hcp:// URI parameters

Platforms Affected:

  • Microsoft Windows Me


Feb 26, 2003

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