Mar 16, 2022•Knowledge
Summary:
On March 16th, 2022 ISC announced a new security issue encountered in BIND 9.18.0 as CVE-2022-0667.
Overview:
We refactored the RFC 8198 Aggressive Use of DNSSEC-Validated Cache feature (synth-from-dnssec) for the new BIND 9.18.0 stable release, and changed the default so that is now automatically enabled for dnssec-validating resolvers. Subsequently it was found that repeated patterns of specific queries to servers with this feature enabled could cause an INSIST failure in query.c:query_dname which causes named to terminate unexpectedly.
The vulnerability affects BIND resolvers running 9.18.0 that have both `dnssec-validation` and `synth-from-dnssec` enabled. (Note that `dnssec-validation auto;` is the default setting unless configured otherwise in `named.conf` and that enabling `dnssec-validation` automatically enables `synth-from-dnssec` unless explicitly disabled).
Impact:
When a vulnerable version of named receives a series of specific queries, the named process will eventually terminate due to a failed assertion check.
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
/RC:C
For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:F/....
Affected Versions
NIOS and BloxOne Products are not vulnerable to this issue as they do not run the affected 9.18.0 BIND release.
Impact
There is no impact to Infoblox NIOS and BloxOne products
Workaround
No workaround necessary
Resolution
No actions needed