Vulnerability Note VU#522393

LizardTech DjVu Browser Plug-in buffer overflow vulnerabilities

Overview

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

I. Description

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.

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 the web browser to crash.

III. Solution

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:

{0e8d0700-75df-11d3-8b4a-0008c7450c4a}

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

Vendor	Status	Date Notified	Date Updated
LizardTech, Inc	Vulnerable	15-Feb-2007

References

http://www.cert.org/tech_tips/securing_browser/
http://www.lizardtech.com/download/dl_download.php?detail=doc_djvu_plugin&platform=win
http://secunia.com/advisories/24149/
http://www.securityfocus.com/bid/22569

Credit

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

This document was written by Will Dormann.

Other Information

Date Public:	2007-02-15
Date First Published:	2007-02-15
Date Last Updated:	2007-02-23
CERT Advisory:
CVE-ID(s):	CVE-2007-0324
NVD-ID(s):	CVE-2007-0324
US-CERT Technical Alerts:
Metric:	8.95
Document Revision:	8

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Produced 2007 by US-CERT, a government organization
Disclaimers and copyright information

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