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Gecko based browsers Stack Corruption

SUMMARY

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.

DETAILS

Vulnerable Systems:

• Mozilla firefox 1.0.6 and prior
• Netscape Browser version 8.0.3.3
• 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&gt;
CAN-2005-2702

ADDITIONAL INFORMATION

The information has been provided by <mailto:[email protected]>
Juha-Matti Laurio .
The original article can be found at:
<http://www.mozilla.org/security/announce/mfsa2005-58.html&gt;
http://www.mozilla.org/security/announce/mfsa2005-58.html
The bug report can be found at:
<https://bugzilla.mozilla.org/show_bug.cgi?id=296134&gt;
https://bugzilla.mozilla.org/show_bug.cgi?id=296134

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