Test ID:	1.3.6.1.4.1.25623.1.0.151717
Category:	Denial of Service
Title:	ISC BIND DoS Vulnerability (CVE-2023-6516) - 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: To keep its cache database efficient, named running as a recursive resolver occasionally attempts to clean up the database. It uses several methods, including some that are asynchronous: a small chunk of memory pointing to the cache element that can be cleaned up is first allocated and then queued for later processing. It was discovered that if the resolver is continuously processing query patterns triggering this type of cache-database maintenance, named may not be able to handle the cleanup events in a timely manner. This in turn enables the list of queued cleanup events to grow infinitely large over time, 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 environmental factors, but 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 version 9.16.0 through 9.16.45 and 9.16.8-S1 through 9.16.45-S1. Solution: Update to version 9.16.48, 9.16.48-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-2023-6516 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/ CVE-2023-6516 https://kb.isc.org/docs/cve-2023-6516 http://www.openwall.com/lists/oss-security/2024/02/13/1
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