[lacnog] New vulnerability in ISC BIND can cause named to crash
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Mie Ene 17 12:29:44 BRST 2018
CVE-2017-3145: Improper fetch cleanup sequencing in the resolver can
cause named to crash
Author: ISC Support Reference Number: AA-01542 Views: 6251 Created:
2018-01-16 14:25 Last Updated: 2018-01-16 20:24 0 Rating/ Voters
Improper sequencing during cleanup can lead to a use-after-free error,
triggering an assertion failure and crash in named.
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
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.
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:
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.
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
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, 09 January 2018
1.1 Packager Notification, added acknowledgement, 15 January 2018
2.0 Public Release, 16 January 2018
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 en isc.org. To report a new issue, please encrypt
your message using security-officer en isc.org's PGP key which can be found
you are unable to use encrypted email, you may also report new issues
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:
This Knowledge Base article https://kb.isc.org/article/AA-01542 is the
complete and official security advisory document.
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