Rule:

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Sid:
2656

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Summary:
This event is generated when an attempt is made to exploit a vulnerability
associated with Netscape Network Security Services (NSS) message parsing.

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Impact:
A successful attack can cause a heap overflow and the subsequent execution
of arbitrary code on a vulnerable server.

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Detailed Information:
A vulnerability exists in the way NSS parses a client connect SSLv2 message
that can cause a heap overflow and the subsequent execution of arbitrary code
on a vulnerable server.  This can occur when an overly long challenge length
and accompanying data are supplied in a Client Hello message.

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Affected Systems:
Netscape Enterprise Webserver all versions
Netscape Personalization Engine all versions
Nescape Directory Server all versions
Netscape Certificate Management Server all versions
Sun One/iPlanet all versions

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Attack Scenarios:
An attacker can send a Client Hello message with an overly long challenge
length and data, causing a heap overflow on a vulnerable server.

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Ease of Attack:
Difficult.

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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:
Sourcefire Vulnerability Research Team
Judy Novak <judy.novak@sourcefire.com>
Brian Caswell <bmc@sourcefire.com>

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Additional References:

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