CVE-2015-5722: Parsing malformed keys may cause BIND to exit due to a failed assertion in buffer.c
mcnally at isc.org
Wed Sep 2 19:55:25 UTC 2015
Document Version: 2.0
Posting date: 2 September 2015
Program Impacted: BIND
Versions affected: BIND 9.0.0 -> 9.8.8, BIND 9.9.0 -> 9.9.7-P2, and
BIND 9.10.0 -> 9.10.2-P3
Parsing a malformed DNSSEC key can cause a validating resolver
to exit due to a failed assertion in buffer.c. It is possible
for a remote attacker to deliberately trigger this condition,
for example by using a query which requires a response from a
zone containing a deliberately malformed key.
Recursive servers are at greatest risk but an authoritative
server could be affected if an attacker controls a zone the
server must query against to perform its zone service.
Servers which are affected may terminate with an assertion
failure, causing denial of service to all clients.
CVSS Score: 7.8
CVSS Vector: (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:
Servers which are not performing validation are not at risk from
this defect (but are at increased risk from other types of DNS
attack.) ISC does not recommend disabling validation to deal with
this issue; upgrading to a fixed version is the preferred solution.
Upgrade to the patched release most closely related to your
current version of BIND. These can all be downloaded from
+ BIND 9 version 9.9.7-P3
+ BIND 9 version 9.10.2-P4
BIND development releases scheduled to be published at the same
time as the public disclosure of this vulnerability will also
contain the fix for this security issue.
+ BIND 9 version 9.9.8rc1
+ BIND 9 version 9.10.3rc1
ISC would like to thank Hanno Boeck from the Fuzzing Project for
discovering and reporting this defect. We would also like to
express our appreciation to the developers of the American Fuzzy
Lop tool, which has been instrumental in revealing recently-disclosed
vulnerabilities in BIND.
Document Revision History:
1.0 Advance Notification 19 August 2015
1.1 "Versions affected" information clarified 24 August, 2015
2.0 Public Disclosure 2 September, 2015
See our BIND9 Security Vulnerability Matrix at
https://kb.isc.org/article/AA-00913 for a complete listing of
Security Vulnerabilities and versions affected.
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Advance Security Notifications, please visit http://www.isc.org/support/.
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ISC patches only currently supported versions. When possible we
indicate EOL versions affected. (For current information on which
versions are actively supported, please see http://www.isc.org/downloads/).
ISC Security Vulnerability Disclosure Policy:
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This Knowledge Base article https://kb.isc.org/article/AA-01287 is
the complete and official security advisory document.
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