Test ID:	1.3.6.1.4.1.25623.1.0.149839
Category:	Denial of Service
Title:	ISC BIND DoS Vulnerability (CVE-2023-2828) - Windows
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: Every named instance configured to run as a recursive resolver maintains a cache database holding the responses to the queries it has recently sent to authoritative servers. The size limit for that cache database can be configured using the max-cache-size statement in the configuration file, it defaults to 90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the cache, to keep memory use below the configured limit. It has been discovered that the effectiveness of the cache-cleaning algorithm used in named can be severely diminished by querying the resolver for specific RRsets in a certain order, effectively allowing the configured max-cache-size limit to be significantly exceeded. Vulnerability Impact: By exploiting this flaw, an attacker can cause the amount of memory used by a named resolver to go well beyond the configured max-cache-size limit. The effectiveness of the attack depends on a number of factors (e.g. query load, query patterns), but since the default value of the max-cache-size statement is 90%, in the worst case the attacker can exhaust all available memory on the host running named, leading to a denial-of-service condition. Affected Software/OS: ISC BIND versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1 and 9.18.11-S1 through 9.18.15-S1. Solution: Update to version 9.16.42, 9.18.16, 9.19.14, 9.16.42-S1, 9.18.16-S1 or later. CVSS Score: 7.8 CVSS Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2023-2828 Debian Security Information: DSA-5439 (Google Search) https://www.debian.org/security/2023/dsa-5439 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/ CVE-2023-2828 https://kb.isc.org/docs/cve-2023-2828 https://lists.debian.org/debian-lts-announce/2023/07/msg00021.html http://www.openwall.com/lists/oss-security/2023/06/21/6
Copyright	Copyright (C) 2023 Greenbone AG

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