Executive Summary

Title Corel / Micrografx ActiveCGM Browser ActiveX control buffer overflows
Name VU#983249 First vendor Publication 2007-06-13
Vendor VU-CERT Last vendor Modification 2007-06-13
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
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Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:C/I:C/A:C)
Cvss Base Score 9.3 Attack Range Network
Cvss Impact Score 10 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
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Vulnerability Note VU#983249

Corel / Micrografx ActiveCGM Browser ActiveX control buffer overflows


The Corel / Micrografx ActiveCGM Browser ActiveX control contains multiple buffer overflows, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

I. Description

The Corel ActiveCGM Browser is an ActiveX control that allows viewing of Computer Graphic Metafiles (CGMs) in a web browser. The ActiveCGM Browser ActiveX control, which is provided by acgm.dll, contains multiple buffer overflows. Note that the control was created by Micrografx, which was acquired by Corel.

II. Impact

By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user. The attacker could also cause Internet Explorer (or the program using the WebBrowser control) to crash.

III. Solution

Apply an update

This vulnerability is addressed in version of the ActiveCGM Browser ActiveX control. Please check with your vendor for update availability. Also consider the following workarounds

Disable the ActiveCGM ActiveX control in Internet Explorer

The vulnerable ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID:

More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG file and imported to set the kill bit for this control:
    Windows Registry Editor Version 5.00

    [HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{F5D98C43-DB16-11cf-8ECA-0000C0FD59C7}]
    "Compatibility Flags"=dword:00000400
Disable ActiveX

Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this and other ActiveX vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document.

Systems Affected

VendorStatusDate Updated
Corel CorporationVulnerable11-Jun-2007




This vulnerability was reported by Will Dormann of CERT/CC.

This document was written by Will Dormann.

Other Information

Date Public06/13/2007
Date First Published06/13/2007 01:50:31 PM
Date Last Updated06/13/2007
CERT Advisory 
CVE NameCVE-2007-2921
Document Revision7

Original Source

Url : http://www.kb.cert.org/vuls/id/983249

CPE : Common Platform Enumeration

Application 1

Open Source Vulnerability Database (OSVDB)

Id Description
35468 Corel / Micrografx ActiveCGM Browser ActiveX (acgm.dll) Multiple Unspecified ...

ActiveCGM contains a flaw that may allow a malicious user to execute arbitrary code on the remote system. The issue is triggered due to multiple unspecified boundary errors. It is possible that the flaw may allow code execution with privileges of the user resulting in a loss of integrity.

Nessus® Vulnerability Scanner

Date Description
2007-06-14 Name : The remote Windows host has an ActiveX control that is susceptible to multipl...
File : corel_activecgm_overflows.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2014-02-17 12:08:20
  • Multiple Updates