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CERT Coordination Center

LizardTech DjVu Browser Plug-in buffer overflow vulnerabilities

Vulnerability Note VU#522393

Original Release Date: 2007-02-15 | Last Revised: 2007-02-23


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. 

Vendor Information


LizardTech, Inc Affected

Notified:  November 21, 2006 Updated: February 15, 2007



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

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


Please install LizardTech DjVu Browser Plug-in 6.1.1.

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

CVSS Metrics

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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
Severity Metric: 8.95
Date Public: 2007-02-15
Date First Published: 2007-02-15
Date Last Updated: 2007-02-23 17:10 UTC
Document Revision: 8

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