CVE-2015-8704: Specific APL data could trigger an INSIST in apl_42.c

[Michael McNally]

CVE:                   CVE-2015-8704
Document Version:      2.0
Posting date:          19 January 2016
Program Impacted:      BIND
Versions affected:     9.3.0->9.8.8, 9.9.0->9.9.8-P2,
                       9.9.3-S1->9.9.8-S3, 9.10.0->9.10.3-P2
Severity:              High
Exploitable:           Remotely

Description:

   A buffer size check used to guard against overflow could cause
   named to exit with an INSIST failure In apl_42.c.

Impact:

   A server could exit due to an INSIST failure in apl_42.c when
   performing certain string formatting operations.  Examples include
   (but may not be limited to):

    -  Slaves using text-format db files could be vulnerable if
       receiving a malformed record in a zone transfer from their master.

    -  Masters using text-format db files could be vulnerable if
       they accept a malformed record in a DDNS update message.

    -  Recursive resolvers are potentially vulnerable when debug
       logging, if they are fed a deliberately malformed record by
       a malicious server.

    -  A server which has cached a specially constructed record
       could encounter this condition while performing 'rndc dumpdb'.

Please Note:

   Versions of BIND from 9.3 through 9.8 are also affected, but
   these branches are beyond their "end of life" (EOL) and no longer
   receive testing or security fixes from ISC. For current information
   on which versions are actively supported, please see
   http://www.isc.org/downloads/.

CVSS Score:            6.8
CVSS Vector:           (AV:N/AC:L/Au:S/C:N/I:N/A:C)

For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2&vector=(AV:N/AC:L/Au:S/C:N/I:N/A:C)

Workarounds:

   None

Active exploits:

   No known active exploits.

Solution:

   Upgrade to the patched release most closely related to your
   current version of BIND.  These can all be downloaded from
   http://www.isc.org/downloads.

    -  BIND 9 version 9.9.8-P3
    -  BIND 9 version 9.10.3-P3

   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-S4

Document Revision History:

   1.0 Advance Notification 12 January 2016
   2.0 Public Disclosure  19 January 2016

Related Documents:

   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/.

Do you still have questions?  Questions regarding this advisory
should go to security-officer at isc.org.  To report a new issue,
please encrypt your message using security-officer at isc.org's PGP
key which can be found here:
   https://www.isc.org/downloads/software-support-policy/openpgp-key/.
If you are unable to use encrypted email, you may also report new
issues at: https://www.isc.org/community/report-bug/.

Note:

   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:

   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-01335
is the complete and official security advisory document.

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