Rule:

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Sid: 313

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Summary:
This event is generated when an attempt to exploit a buffer overflow condition in ntalkd is made.

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Impact:
Serious. System compromize presenting the attacker with the opportunity to gain remote access to the victim host or execute arbitrary code with the privileges of the superuser account.

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Detailed Information:
Some versions of the Network Talk Daemon (ntalkd) are vulnerable to a buffer overflow condition which can present the attacker with a root shell.

Talk is used to communicate between users of UNIX based operating systems. A vulnerability exists such that a buffer overflow condition in talk can be exploited by a malicious user. This may then present the attacker with the opportunity to gain root access to the target system.

Affected Versions:
	Multiple vendors

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Attack Scenarios:
Once the overflow has been created, the attacker is able to supply incorrect hostname information to the target system and gain root access.

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Ease of Attack:
Simple. 

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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.

Apply vendor supplied patches.

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Contributors:
Original rule writer unknown
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

Bugtraq:
http://www.securityfocus.com/bid/210

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