BIND Negative Cache Poisoning Vulnerability - Advisories

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BIND Negative Cache Poisoning Vulnerability

Secunia Advisory:	SA10300
Release Date:	2003-11-27
Last Update:	2003-12-02

Critical:	Not critical
Impact:	DoS
Where:	From local network
Solution Status:	Vendor Patch

Software:	ISC BIND 8.x.x

CVE reference:	CVE-2003-0914 (Secunia mirror)

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Description: ISC has released a new version of BIND 8, which fixes a vulnerability allowing malicious people to poison the DNS cache. The problem is that negative answers may be cached from the wrong source. This can be exploited to cause a "Denial of Service" against certain domains, because BIND will read the wrongly cached negative answer instead of querying the right source. Solution: A DNS cache should only be accessible from specified IP addresses. A proper firewall filter will limit the possibilities of sending spoofed or fake answers to the DNS cache. ISC has released BIND 8.3.7 and 8.4.3: ftp://ftp.isc.org/isc/bind/src/8.3.7/ ftp://ftp.isc.org/isc/bind/src/8.4.3/ http://www.isc.org/products/BIND/bind8.html Changelog: 2003-12-02: Added link to CERT vulnerability note. Original Advisory: http://www.isc.org/products/BIND/bind8.html Other References: CERT VU#734644: http://www.kb.cert.org/vuls/id/734644



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise. Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

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