BIND DNS Servers Receive Patches for 14 Vulnerabilities Including High-Severity DoS Flaws
The Internet Systems Consortium has published an update for BIND 9 that resolves 14 vulnerabilities in the world’s most widely deployed DNS server software. Seven of the flaws received a CVSS score of 7.5 and were classified as high severity, while the remaining seven scored between 5.3 and 6.5.
BIND performs the critical function of translating domain names into IP addresses. When the service stops or returns incorrect answers, the impact extends far beyond the individual server and affects every service that depends on name resolution.
The most severe issue permits an unauthenticated remote attacker to terminate the named process with a single request that carries an invalid SIG(0) signature over DNS over HTTPS. The majority of the corrected vulnerabilities do not require authentication. Several others open avenues for cache poisoning: one allows acceptance of a forged NXDOMAIN response, another downgrades secure delegation so that an unsigned answer is accepted, and a third permits out-of-zone data to be served as authoritative.
Additional problems include resource-exhaustion conditions that cause uncontrolled cache growth and excessive CPU usage, as well as integrity issues during multi-message zone transfers.
Affected versions are BIND 9.11.0 to 9.18.50, 9.20.0 to 9.20.27, and 9.21.0 to 9.21.25. Fixed releases are 9.20.29, 9.21.26, and the preview-supported 9.20.29-S1. No workarounds are available for any of the flaws. The ISC states it is not aware of any exploitation of the vulnerabilities, and none have been added to CISA’s catalog of known exploited vulnerabilities. Organizations still running the 9.18 branch are advised to plan migration to the 9.20 series.
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