Microsoft Internet Explorer contains buffer overflow in processing of object types

ID VU:679556
Type cert
Reporter CERT
Modified 2003-06-04T00:00:00



A remotely exploitable vulnerability has been discovered in Internet Explorer. Exploitation of this vulnerability may lead to the execution of arbitrary code.


A remotely exploitable buffer overflow vulnerability has been discovered in Internet Explorer versions 5.1, 5.5 and 6.0. The <object> tag contains a "type" field used to determine how Internet Explorer should treat an object. It is possible to bypass the buffer checks on the input to the "type" field by using a specific character and cause a buffer overflow.

An attacker could create an HTML file that includes a malicious <OBJECT> tag to execute arbitrary code on the victim's machine. When a victim using a vulnerable version of IE, or other applications that use IE as their HTML interpreter, visits the malicious file (via web page, email message, file sharing, etc.), the attacker-supplied code will be executed.


Exploitation of this vulnerability may lead to the execution of arbitrary code with the privileges of the current user.


Microsoft has released MS03-020 to resolve this issue.

Systems Affected

Vendor| Status| Date Notified| Date Updated
Microsoft Corporation| | -| 04 Jun 2003
If you are a vendor and your product is affected, let us know.

CVSS Metrics

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


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Thanks to Microsoft Security and eEye Digital Security for reporting this vulnerability.

This document was written by Jason A Rafail.

Other Information

  • CVE IDs: CAN-2003-0344
  • Date Public: 04 Jun 2003
  • Date First Published: 04 Jun 2003
  • Date Last Updated: 04 Jun 2003
  • Severity Metric: 17.47
  • Document Revision: 11