CVE-2022-0635

Name of the Vulnerable Software and Affected Versions BIND version 9.18.0

Description The issue is related to a reachable assertion when handling DNS queries. An attacker can exploit this by sending repeated patterns of specific queries to servers with the DNSSEC-Validated Cache feature enabled, causing an INSIST error in query.c:query dname and leading to the unexpected termination of the named process. This occurs when a vulnerable version of named receives a series of specific queries, resulting in a failed assertion check.

Recommendations For BIND version 9.18.0, consider disabling the DNSSEC-Validated Cache feature as a temporary workaround until a patch is available. Restrict access to the query dname function to minimize the risk of exploitation. Avoid using the synth-from-dnssec feature in the affected API endpoint until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.