CVE-2017-3145: Improper fetch cleanup sequencing in the resolver can cause named to crash
Brian Conry
bconry at isc.org
Tue Jan 16 21:09:28 UTC 2018
CVE-2017-3145: Improper sequencing during cleanup can lead to a
use-after-free error, triggering an assertion failure and crash in
named.
CVE: CVE-2017-3145
Document Version: 2.0
Posting date: 16 January 2018
Program Impacted: BIND
Versions affected: 9.0.0 to 9.8.x, 9.9.0 to 9.9.11, 9.10.0 to 9.10.6,
9.11.0 to 9.11.2, 9.9.3-S1 to 9.9.11-S1,
9.10.5-S1 to 9.10.6-S1, 9.12.0a1 to 9.12.0rc1
Severity: High
Exploitable: Remotely
Description:
BIND was improperly sequencing cleanup operations on upstream
recursion fetch contexts, leading in some cases to a use-after-free
error that can trigger an assertion failure and crash in named.
Impact:
While this bug has existed in BIND since 9.0.0, there are no known
code paths leading to it in ISC releases prior to those containing
the fix for CVE-2017-3137. Thus while all instances of BIND ought
to be patched, only ISC versions [9.9.9-P8 to 9.9.11, 9.10.4-P8 to
9.10.6, 9.11.0-P5 to 9.11.2, 9.9.9-S10 to 9.9.11-S1, 9.10.5-S1 to
9.10.6-S1, and 9.12.0a1 to 9.12.0rc1] acting as DNSSEC validating
resolvers are currently known to crash due to this bug. The known
crash is an assertion failure in netaddr.c.
CVSS Score: 7.5
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
For more information on the Common Vulnerability Scoring System and to
obtain your specific environmental score please visit:
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Workarounds:
If an operator is experiencing crashes due to this, temporarily
disabling DNSSEC validation can be used to avoid the known
problematic code path while replacement builds are prepared.
Active exploits:
No known active exploits but crashes due to this bug have been
reported by multiple parties.
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 9.9.11-P1
- BIND 9 version 9.10.6-P1
- BIND 9 version 9.11.2-P1
- BIND 9 version 9.12.0rc2
BIND Supported Preview Edition is a special feature preview branch
of BIND provided to eligible ISC support customers.
- BIND 9 version 9.9.11-S2
- BIND 9 version 9.10.6-S2
Acknowledgements:
ISC would like to thank Jayachandran Palanisamy of Cygate AB for
making us aware of this vulnerability.
Document Revision History:
1.0 Advance Notification, 9 January 2018
1.1 Packager Notification, added acknowledgement, 15 January 2018
2.0 Public announcement, 16 January 2018
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
Legal Disclaimer:
Internet Systems Consortium (ISC) is providing this notice on an "AS
IS" basis. No warranty or guarantee of any kind is expressed in this
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(c) 2001-2018 Internet Systems Consortium
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