Rule:

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Sid:
311

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Summary:
Versions of the Netscape browser including and prior to 4.75 are vulnerable to a buffer overflow that may lead to arbitrary code execution on the victim host. It is also possible to open a root shell listening on a high port on the victim host. This event is generated when a request is made to a web site exploiting this vulnerability.

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Impact:
System compromize presenting the attacker with the opportunity to
execute arbitrary code on the victim host.

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Detailed Information:
A buffer overflow condition exists in the HTML parser on some versions of Netscape Navigator. It is possible for a remote attacker to execute arbitrary code on the victim host.

It is possible to crash Netscape Communicator if a large number of characters is supplied in a command from an interactive web page.

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Affected Systems:
Netscape Navigator 4.75 and prior

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Attack Scenarios:
The attacker would need to supply a link on a web page or HTML email that triggers the overflow. It is also possible to cause the overflow via HTML email.

Exploit scripts are available

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Ease of Attack:
Simple. Exploits are available.

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action:
Upgrade to the latest non-affected version of the software.

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Contributors:
Max Vision <vision@whitehats.com>
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2000-1187

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