CVE-2013-3919: A recursive resolver can be crashed by a query for a malformed zone
mcnally at isc.org
Tue Jun 4 23:53:14 UTC 2013
A defect exists which allows an attacker to crash a BIND 9 recursive
resolver with a RUNTIME_CHECK error in resolver.c
Document Version: 1.0
Posting date: 04 Jun 2013
Program Impacted: BIND 9
BIND 9.6-ESV-R9, 9.8.5, and 9.9.3 are affected
Versions 9.6.0 through 9.6-ESV-R8, 9.8.0 through 9.8.4-P2, and
9.9.0 through 9.9.2-P2 ARE NOT affected.
Other major branches of BIND (e.g. 9.7, 9.5, etc) are not
vulnerable but they are no longer supported by ISC and may lack
other important security fixes.
A bug has been discovered in the most recent releases of BIND 9
which has the potential for deliberate exploitation as a
denial-of-service attack. By sending a recursive resolver a query
for a record in a specially malformed zone, an attacker can cause
BIND 9 to exit with a fatal "RUNTIME_CHECK" error in resolver.c
Triggering this defect will cause the affected server to exit
with an error, denying service to recursive DNS clients that use
that particular server.
CVSS Score: 7.8
CVSS Equation: (AV:N/AC:L/Au:N/C:N/I:N/A:C)
For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
At the time of this advisory no intentional exploitation of this
bug has been observed in the wild. However, the existence of the
issue has been disclosed on an open mailing list with enough
accompanying detail to reverse engineer an attack and ISC is
therefore treating this as a Type II (publicly disclosed)
vulnerability, in accordance with our Phased Disclosure Process.
New versions of BIND are being provided which contain a fix for
the defect. The recommended solution is to upgrade to the patched
release most closely related to your current version of BIND.
These can all be downloaded from http://ftp.isc.org/isc/bind9
- BIND 9 version 9.9.3-P1
- BIND 9 version 9.8.5-P1
- BIND 9 version 9.6-ESV-R9-P1
Document Revision History:
1.0 Type II Public Disclosure, 04 June, 2013
See our BIND Security Matrix for a complete listing of Security
Vulnerabilities and versions affected.
If you'd like more information on our product support please
Do you still have questions? Questions regarding this advisory
should go to security-officer at isc.org
Note: ISC patches only currently supported versions. When possible
we indicate EOL versions affected.
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can
be found here: ISC Software Defect and Security Vulnerability
This Knowledge Base article https://kb.isc.org/article/AA-00967 is
the complete and official security advisory document.
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