Vulnerability Note VU#795694

ISC BIND named negative caching vulnerability

Original Release date: 27 May 2011 | Last revised: 01 Jun 2011


ISC BIND contains a vulnerability in the processing of large RRSIG RRsets included in a negative cache response.


According to ISC:

DNS systems use negative caching to improve DNS response time. This will keep a DNS resolver from repeatedly looking up domains that do not exist. Any NXDOMAIN or NODATA/NOERROR response will be put into the negative cache.

The authority data will be cached along with the negative cache information. These authoritative “Start of Authority” (SOA) and NSEC/NSEC3 records prove the nonexistence of the requested name/type. In DNSSEC, all of these records are signed; this adds one additional RRSIG record, per DNSSEC key, for each record returned in the authority section of the response.

In this vulnerability, very large RRSIG RRsets included in a negative response can trigger an assertion failure that will crash named (BIND 9 DNS) due to an off-by-one error in a buffer size check.

The nature of this vulnerability would allow remote exploit. An attacker can set up a DNSSEC signed authoritative DNS server with large RRSIG RRsets to act as the trigger. The attacker would then find ways to query an organization’s caching resolvers for non-existent names in the domain served by the bad server, getting a response that would “trigger” the vulnerability. The attacker would require access to an organization’s caching resolvers; access to the resolvers can be direct (open resolvers), through malware (using a BOTNET to query negative caches), or through driving DNS resolution (a SPAM run that has a domain in the E-mail that will cause the client to perform a lookup).


A remote, unauthenticated attacker can cause the named daemon to crash creating a denial of service condition.


Apply an update

Users who obtain BIND from a third-party vendor, such as their operating system vendor, should see the vendor information portion of this document for a partial list of affected vendors.

This vulnerability is addressed in ISC BIND versions 9.4-ESV-R4-P1, 9.6-ESV-R4-P1, 9.7.3-P1 and 9.8.0-P2. Users of BIND from the original source distribution should upgrade to this version.

See also

According to ISC:
Restricting access to the DNS caching resolver infrastructure will provide partial mitigation. Active exploitation can be accomplished through malware or SPAM/Malvertizing actions that will force authorized clients to look up domains that would trigger this vulnerability.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate Updated
Internet Systems ConsortiumAffected-27 May 2011
Mandriva S. A.Affected-01 Jun 2011
UbuntuAffected-01 Jun 2011
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



Thanks to Internet Systems Consortium for reporting this vulnerability.

This document was written by Michael Orlando.

Other Information

  • CVE IDs: cve-2011-1910
  • Date Public: 26 May 2011
  • Date First Published: 27 May 2011
  • Date Last Updated: 01 Jun 2011
  • Severity Metric: 4.93
  • Document Revision: 11


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