CVE-2023-5517

Una falla en el código de manejo de consultas puede causar que `named` se cierre prematuramente con un error de aserción cuando: - `nxdomain-redirect ;` está configurado, y - el solucionador recibe una consulta PTR para una dirección RFC 1918 que normalmente dar como resultado una respuesta NXDOMAIN autorizada. Este problema afecta a las versiones de BIND 9, 9.12.0 a 9.16.45, 9.18.0 a 9.18.21, 9.19.0 a 9.19.19, 9.16.8-S1 a 9.16.45-S1 y 9.18.11-S1 a 9.18. .21-S1.

A flaw was found in the bind package which may result in a Denial of Service in `named` process. This is a result of a reachable assertion, leading `named` to prematurely terminate when both conditions are met: nxdomain-redirect for the queried domain is configured and the resolver receives a PTR query, used for a reverse DNS lookup, for a RFC 1918 address that would normally result in an authoritative `NXDOMAIN` response. A single query matching both conditions can lead to a Denial of Service in the named application.

A flaw in query-handling code can cause `named` to exit prematurely with an assertion failure when: - `nxdomain-redirect <domain>;` is configured, and - the resolver receives a PTR query for an RFC 1918 address that would normally result in an authoritative NXDOMAIN response. This issue affects BIND 9 versions 9.12.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.

Shoham Danino, Anat Bremler-Barr, Yehuda Afek, and Yuval Shavitt discovered that Bind incorrectly handled parsing large DNS messages. A remote attacker could possibly use this issue to cause Bind to consume resources, leading to a denial of service. Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered that Bind incorrectly handled validating DNSSEC messages. A remote attacker could possibly use this issue to cause Bind to consume resources, leading to a denial of service.