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Lack of proper length and value checking allow attacker to cause a buffer overflow and execute arbitrary code or cause a DoS using Gecko based web browsers.
Vulnerable Systems: * Mozilla firefox 1.0.6 and prior * Netscape Browser version 188.8.131.52 * K-Meleon Browser version 0.9
Immune Systems: * Mozilla firefox 1.0.7
Stack Corruption: The problem existed in "zero-width non-joiner" sequence of unicode chars that uses Arabic shaping style. Because the code did not checked for buffer length before manipulating the given text. On a crafted content, it is possible to cause the buffer to be twice the size the actual data, and memory allocated for the buffer itself.
Proof of Concept: < html> < body> & #8204;& #8204;&# 8204;& #8204;& #8204;& #8204;& #8204;& #8204;& #1742; & #8204;& #8204;& #1740;& #8204; < /body> < /html>
CVE Information: <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2702> CAN-2005-2702
The information has been provided by <mailto:firstname.lastname@example.org>
Juha-Matti Laurio .
The original article can be found at:
<http://www.mozilla.org/security/announce/mfsa2005-58.html> http://www.mozilla.org/security/announce/mfsa2005-58.html The bug report can be found at:
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