Test ID:	1.3.6.1.4.1.25623.1.0.145865
Category:	Denial of Service
Title:	ISC BIND DoS Vulnerability (CVE-2021-25215) - Linux
Summary:	ISC BIND is prone to a denial of service (DoS) vulnerability.
Description:	Summary: ISC BIND is prone to a denial of service (DoS) vulnerability. Vulnerability Insight: DNAME records, described in RFC 6672, provide a way to redirect a subtree of the domain name tree in the DNS. A flaw in the way named processes these records may trigger an attempt to add the same RRset to the ANSWER section more than once. This causes an assertion check in BIND to fail. DNAME records are processed by both authoritative and recursive servers. For authoritative servers, the DNAME record triggering the flaw can be retrieved from a zone database. For servers performing recursion, such a record is processed in the course of a query sent to an authoritative server. Vulnerability Impact: When a vulnerable version of named receives a query for a record triggering the flaw described above, the named process will terminate due to a failed assertion check. Affected Software/OS: BIND 9.0.0 through 9.11.29, 9.12.0 through 9.16.13, 9.9.3-S1 through 9.11.29-S1, 9.16.8-S1 through 9.16.13-S1 and 9.17.0 through 9.17.11. Solution: Update to version 9.11.31, 9.16.15, 9.17.12, 9.11.31-S1, 9.16.15-S1 or later. CVSS Score: 5.0 CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2021-25215 https://kb.isc.org/v1/docs/cve-2021-25215 https://security.netapp.com/advisory/ntap-20210521-0006/ Debian Security Information: DSA-4909 (Google Search) https://www.debian.org/security/2021/dsa-4909 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDSRPCJQ7MZC6CENH5PO3VQOFI7VSWBE/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VEC2XG4Q2ODTN2C4CGXEIXU3EUTBMK7L/ https://www.oracle.com/security-alerts/cpuoct2021.html https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html http://www.openwall.com/lists/oss-security/2021/04/29/1 http://www.openwall.com/lists/oss-security/2021/04/29/2 http://www.openwall.com/lists/oss-security/2021/04/29/3 http://www.openwall.com/lists/oss-security/2021/04/29/4
Copyright	Copyright (C) 2021 Greenbone Networks GmbH

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