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AUSCERT External Security Bulletin Redistribution
CVE-2022-0667: Assertion failure on delayed DS lookup
17 March 2022
AusCERT Security Bulletin Summary
Product: Bind 9.18.0
Operating System: UNIX variants (UNIX, Linux, OSX)
CVE Names: CVE-2022-0667
Comment: CVSS (Max): 7.0 CVE-2022-0667 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: ISC
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Document version: 2.0
Posting date: 16 March 2022
Program impacted: BIND
Versions affected: BIND 9.18.0
In BIND 9.18.0 the recursive client code was refactored. This
introduced a "backstop lifetime timer".
While BIND is processing a request for a DS record that needs to be
forwarded, it waits until this processing is complete or until the
lifetime timer has timed out. When the `resume_dslookup()` function is
called as a result of such a timeout, the function does not test whether
the fetch has previously been shut down. This introduces the possibility
of triggering an assertion failure, which could cause the BIND process
Only the BIND 9.18 branch is affected.
When the vulnerability is triggered the BIND process will exit.
CVSS Score: 7.0
CVSS Vector: CVSS:3.1:AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C
For more information on the Common Vulnerability Scoring System and to
obtain your specific environmental score, please visit:
No workarounds known.
We are not aware of any active exploits.
Users of BIND 9.18.0 should upgrade to BIND 9.18.1
Document revision history:
1.0 Early Notification, 9 March 2022
2.0 Public disclosure, 16 March 2022
See our BIND 9 Security Vulnerability Matrix for a complete listing of
security vulnerabilities and versions affected:
Do you still have questions? Questions regarding this advisory should go
to firstname.lastname@example.org. To report a new issue, please encrypt your
message using email@example.com's PGP key which can be found here:
https://www.isc.org/pgpkey/. If you are unable to use encrypted email, you
may also report new issues at: https://www.isc.org/reportbug/.
ISC patches only currently supported versions. When possible we indicate
EOL versions affected. (For current information on which versions are
actively supported, please see https://www.isc.org/download/.)
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can be found
in the ISC Software Defect and Security Vulnerability Disclosure Policy at
This Knowledgebase article https://kb.isc.org/docs/cve-2022-0667 is
the complete and official security advisory document.
Internet Systems Consortium (ISC) is providing this notice on an "AS IS"
basis. No warranty or guarantee of any kind is expressed in this notice
and none should be implied. ISC expressly excludes and disclaims any
warranties regarding this notice or materials referred to in this
notice, including, without limitation, any implied warranty of
merchantability, fitness for a particular purpose, absence of hidden
defects, or of non-infringement. Your use or reliance on this notice or
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this notice at any time. A stand-alone copy or paraphrase of the text of
this document that omits the document URL is an uncontrolled copy.
Uncontrolled copies may lack important information, be out of date, or
contain factual errors.
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