__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN LizardTech DjVu Browser Plug-in Vulnerability [US-CERT Vulnerability VU#522393] February 15, 2007 20:00 GMT Number R-143 ______________________________________________________________________________ PROBLEM: The LizardTech DjVu Browser Plug-in contains multiple buffer overflows, which could allow an attacker to execute arbitrary code on a vulnerable system. PLATFORM: DjVu Browser Plug-in version 6.1.0 DAMAGE: Execution of arbitrary code. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. By convincing a user to view a specially ASSESSMENT: 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. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-143.shtml ORIGINAL BULLETIN: http://www.kb.cert.org/vuls/id/522393 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2007-0324 ______________________________________________________________________________ [***** Start US-CERT Vulnerability VU#522393 *****] 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 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/ 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 02/15/2007 Date First Published 02/15/2007 08:38:28 AM Date Last Updated 02/15/2007 CERT Advisory CVE Name CVE-2007-0324 Metric 8.95 Document Revision 7 If you have feedback, comments, or additional information about this vulnerability, please send us email. [***** End US-CERT Vulnerability VU#522393 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of US-CERT for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. 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