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Microsoft Hyperlink Object Library buffer overflow

Vulnerability Note VU#820427

Original Release Date: 2005-02-08 | Last Revised: 2005-02-08

Overview

A buffer overflow exists in the Microsoft Windows system library used when handling hyperlinks. All currently supported versions of Microsoft Windows are affected.

Description

An unchecked buffer in the Microsoft Object Library is vulnerable to attack when malformed hyperlinks are handled. Such handling occurs most often when a user clicks on a hyperlink in a browser or in HTML-rendered email.

The Object Library is a dynamic application interface library used by Windows programs to manage hyperlink objects. Hyperlink objects are any COM objects (including ActiveX) that implement the IHlink interface.

Impact

An attacker could execute arbitrary code of their choosing on the system running the vulnerable version of Windows. Upon successful exploitation, the malicious code would be executed with the privileges of the user being attacked.

Solution

Apply a patch from the vendor

Microsoft has published Microsoft Security Bulletin MS05-015 in response to this issue. Users are encouraged to review this bulletin and apply the patches it refers to.

Workarounds



As noted in Microsoft Security Bulletin MS05-015:

Read e-mail messages in plain text format if you are using Outlook 2002 or a later version, or Outlook Express 6 SP1 or a later version, to help protect yourself from the HTML e-mail attack vector.

Note that an email-borne attack vector requires a click event on a hyperlink to occur.

Vendor Information

820427
 
Affected   Unknown   Unaffected

Microsoft Corporation

Updated:  February 08, 2005

Status

  Vulnerable

Vendor Statement

Please see Microsoft Security Bulletin MS05-015 at

http://www.microsoft.com/technet/security/bulletin/ms05-015.mspx

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

US-CERT has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Credit

Microsoft has acknowledged Anna Hollingzworth as the discoverer of this vulnerability.

This document was written by Jeffrey S Havrilla.

Other Information

CVE IDs: CVE-2005-0057
Severity Metric: 55.28
Date Public: 2005-02-08
Date First Published: 2005-02-08
Date Last Updated: 2005-02-08 22:39 UTC
Document Revision: 10

Sponsored by the Department of Homeland Security Office of Cybersecurity and Communications.