Test ID:	1.3.6.1.4.1.25623.1.0.149470
Category:	Denial of Service
Title:	PowerDNS Recursor DoS Vulnerability (2023-02)
Summary:	PowerDNS Recursor is prone to a denial of service (DoS); vulnerability.
Description:	Summary: PowerDNS Recursor is prone to a denial of service (DoS) vulnerability. Vulnerability Insight: When the recursor detects and deters a spoofing attempt or receives certain malformed DNS packets, it throttles the server that was the target of the impersonation attempt so that other authoritative servers for the same zone will be more likely to be used in the future, in case the attacker controls the path to one server only. Unfortunately this mechanism can be used by an attacker with the ability to send queries to the recursor, guess the correct source port of the corresponding outgoing query and inject packets with a spoofed IP address to force the recursor to mark specific authoritative servers as not available, leading a denial of service for the zones served by those servers. Affected Software/OS: PowerDNS Recursor version 4.6.5 and prior, 4.7.x through 4.7.4 and 4.8.x through 4.8.3. Solution: Update to version 4.6.6, 4.7.5, 4.8.4 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-2023-26437 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CN7VMRYKZHG2UDUAK326LXD3JY7NO3LR/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IHPD6SIQOG7245GXFQHPUEI4AZ6Y3KD6/ https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2023-02.html
Copyright	Copyright (C) 2023 Greenbone AG

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