Rule:

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Sid:
259

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Summary:
This event is generated by an attempted buffer overflow associated with incorrect validation of DNS NXT records.

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Impact:
Severe. The DNS server can be compromised allowing the attacker to execute arbitrary commands with the privileges of the user running BIND.

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Detailed Information:
Improper validation of DNS NXT records may allow at attacker to perform a buffer overflow.  This can allow the attacker to execute arbitrary code with the privileges of the user running BIND.

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Affected Systems:
BIND versions 8.2 up to, but not including, 8.2.2.

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Attack Scenarios:
An attacker can launch this exploit to gain remote access to the DNS server.

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Ease of Attack:
Simple.  Code exists to exploit the buffer overflow.

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False Positives:
None Known

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False Negatives:
This rule examines content based on the exploit code written by ADM.  If the content is changed, the rule may not fire.

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Corrective Action:
Upgrade to a version of BIND 8.2.2 or greater, or patch vulnerable versions of BIND.

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Contributors:
Original rule writer unknown
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:

CERT:
http://www.cert.org/advisories/CA-1999-14.html

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0833

Bugtraq:
http://www.securityfocus.com/bid/788


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