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Secunia Security Advisory 38219

Secunia Security Advisory 38219
Posted Jan 20, 2010
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Some vulnerabilities have been reported in ISC BIND, which can be exploited by malicious people to poison the DNS cache.

tags | advisory, vulnerability
MD5 | 4db5ab372a24af45d4bd5d1f7f1b1b7d

Secunia Security Advisory 38219

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Secunia integrated with Microsoft WSUS
http://secunia.com/blog/71/



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TITLE:
ISC BIND DNSSEC CNAME / DNAME and NXDOMAIN Cache Poisoning
Vulnerabilities

SECUNIA ADVISORY ID:
SA38219

VERIFY ADVISORY:
http://secunia.com/advisories/38219/

DESCRIPTION:
Some vulnerabilities have been reported in ISC BIND, which can be
exploited by malicious people to poison the DNS cache.

1) A vulnerability is caused due to BIND caching CNAME or DNAME
records of a response without proper DNSSEC verification when
processing recursive client requests with checking disabled (CD) or
internally triggered queries for missing records for recursive name
resolution.

Successful exploitation requires that recursive queries are enabled
and that the nameserver performs DNSSEC validation for its clients.
Authoritative-only nameservers are not affected.

This is related to:
SA37426

2) An error within the DNSSEC NSEC/NSEC3 validation mechanism could
lead to bogus NXDOMAIN responses being cached as correctly validated,
resulting in later queries to the resolver returning the bogus
NXDOMAIN with the AD flag set.

Note: Successful exploitation requires that attackers are able to
bypass traditional protection mechanisms like source port
randomization and transaction IDs.

The vulnerabilities are reported in versions prior to 9.4.3-P5,
9.5.2-P2, and 9.6.1-P3.

SOLUTION:
Update to 9.4.3-P5, 9.5.2-P2, or 9.6.1-P3.

PROVIDED AND/OR DISCOVERED BY:
1) The vendor credits Alexander Gall
2) Reported by the vendor.

ORIGINAL ADVISORY:
1) https://www.isc.org/advisories/CVE-2009-4022v6
2) https://www.isc.org/advisories/CVE2010-0097

OTHER REFERENCES:
SA37426:
http://secunia.com/advisories/37426/

US-CERT VU#360341:
http://www.kb.cert.org/vuls/id/360341

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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