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CVE-2023-6516— Specific recursive query patterns may lead to an out-of-memory condition

Quick assessment

Affected
ISC BIND 9
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 ISC BIND 存在安全漏洞，该漏洞源于特定的递归查询模式可能会导致内存不足。

CVSS 7.5 · High EPSS 1.11% · P65

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2023-6516

Vulnerability Information
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Vulnerability Title
Specific recursive query patterns may lead to an out-of-memory condition
Source: CVE Program / CVE List V5
Vulnerability Description
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. This issue affects BIND 9 versions 9.16.0 through 9.16.45 and 9.16.8-S1 through 9.16.45-S1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 ISC BIND 存在安全漏洞，该漏洞源于特定的递归查询模式可能会导致内存不足。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ISC BIND 9 9.16.0 ~ 9.16.45 -

II. Public POCs for CVE-2023-6516

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III. Intelligence Information for CVE-2023-6516

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Vendor Advisories for CVE-2023-6516 (1)

Mailing List Discussions for CVE-2023-6516 (3)

Other References for CVE-2023-6516 (1)

Same Patch Batch · ISC · 2024-02-13 · 5 CVEs total

CVE-2023-4408 7.5 HIGH Parsing large DNS messages may cause excessive CPU load
CVE-2023-5517 7.5 HIGH Querying RFC 1918 reverse zones may cause an assertion failure when "nxdomain-redirect" is
CVE-2023-5679 7.5 HIGH Enabling both DNS64 and serve-stale may cause an assertion failure during recursive resolu
CVE-2023-5680 5.3 MEDIUM Cleaning an ECS-enabled cache may cause excessive CPU load

IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC

V. Comments for CVE-2023-6516

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