CVE-2016-1286: A problem parsing resource record signatures for DNAME resource records can lead to an assertion failure in resolver.c or db.c
mcnally at isc.org
Wed Mar 9 21:05:37 UTC 2016
Document Version: 2.0
Posting date: 09 March 2016
Program Impacted: BIND
Versions affected: 9.0.0 -> 9.8.8, 9.9.0 -> 9.9.8-P3,
9.9.3-S1 -> 9.9.8-S5, 9.10.0 -> 9.10.3-P3
An error when parsing signature records for DNAME records having
specific properties can lead to named exiting due to an assertion
failure in resolver.c or db.c.
An attacker able to cause a server to make a query deliberately
chosen to generate a response containing a signature record which
would exercise this vulnerability can cause named to stop execution
with an assertion failure, resulting in denial of service to
clients. Recursive resolvers are at the highest risk of
vulnerability to this attack but authoritative-only servers may
be also be vulnerable if the attacker can control the answers
for records requested when the authoritative server is performing
service on zones (e.g. a slave server doing SOA queries.) Servers
may be affected even if they are not performing validation or
have DNSSEC disabled entirely as long as they receive a response
containing offending signature records. Disabling DNSSEC does
not provide protection against this vulnerability.
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:
No known active exploits.
Upgrade to the patched release most closely related to your
current version of BIND:
- BIND 9 version 9.9.8-P4
- BIND 9 version 9.10.3-P4
BIND 9 Supported Preview edition is a feature preview version
of BIND provided exclusively to eligible ISC Support customers.
- BIND 9 version 9.9.8-S6
Document Revision History:
1.0 Advance Notification 02 March 2016
1.1 "Versions affected" and "Solution" text expanded to cover BIND 9
Supported Preview Edition; "Versions affected" and "Impact" text
expanded to cover all old versions. 07 March 2016
2.0 Public Disclosure. 09 March 2016
See our BIND9 Security Vulnerability Matrix at
https://kb.isc.org/article/AA-00913 for a complete listing of
Security Vulnerabilities and versions affected.
If you'd like more information on ISC Subscription Support and
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
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can
be found here: https://kb.isc.org/article/AA-00861
This Knowledge Base article https://kb.isc.org/article/AA-01353 is
the complete and official security advisory document.
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