Vulnerability Note VU#522393

LizardTech DjVu Browser Plug-in buffer overflow vulnerabilities

Original Release date: 15 Feb 2007 | Last revised: 23 Feb 2007


The LizardTech DjVu Browser Plug-in contains multiple buffer overflows, which could allow an attacker to execute arbitrary code on a vulnerable system.


The LizardTech DjVu Browser Plug-in is an application that allows the user to view DjVu documents in a web browser. It is available as an ActiveX control for IE-based browsers, and as a Netscape style plug-in for other browsers such as Firefox and Safari. The LizardTech DjVu Browser Plug-in contains multiple buffer overflow vulnerabilities.


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 the web browser to crash.


Apply an update

This issue is resolved in the DjVu Browser Plug-in version 6.1.1.

Disable the DjVu 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_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{0e8d0700-75df-11d3-8b4a-0008c7450c4a}]
    "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 (Learn More)

VendorStatusDate NotifiedDate Updated
LizardTech, IncAffected21 Nov 200615 Feb 2007
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

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



This vulnerability was reported by Will Dormann of CERT/CC. The vulnerability was also independently discovered and publicly disclosed by Brett Moore of

This document was written by Will Dormann.

Other Information

  • CVE IDs: CVE-2007-0324
  • Date Public: 15 Feb 2007
  • Date First Published: 15 Feb 2007
  • Date Last Updated: 23 Feb 2007
  • Severity Metric: 8.95
  • Document Revision: 8


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