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CVE-2023-2911— Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0

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 9存在安全漏洞，该漏洞源于存在堆栈溢出，攻击者利用该漏洞可以导致命名意外终止。

CVSS 7.5 · High EPSS 2.45% · P84

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth
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I. Basic Information for CVE-2023-2911

Vulnerability Information
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Vulnerability Title
Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0
Source: CVE Program / CVE List V5
Vulnerability Description
If the `recursive-clients` quota is reached on a BIND 9 resolver configured with both `stale-answer-enable yes;` and `stale-answer-client-timeout 0;`, a sequence of serve-stale-related lookups could cause `named` to loop and terminate unexpectedly due to a stack overflow. This issue affects BIND 9 versions 9.16.33 through 9.16.41, 9.18.7 through 9.18.15, 9.16.33-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-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 缓冲区错误漏洞
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 9存在安全漏洞，该漏洞源于存在堆栈溢出，攻击者利用该漏洞可以导致命名意外终止。
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 9.16.33 ~ 9.16.41 -

II. Public POCs for CVE-2023-2911

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III. Intelligence Information for CVE-2023-2911

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Vendor Advisories for CVE-2023-2911 (2)

Mailing List Discussions for CVE-2023-2911 (3)

Other References for CVE-2023-2911 (1)

Same Patch Batch · ISC · 2023-06-21 · 3 CVEs total

CVE-2023-2829 7.5 HIGH Malformed NSEC records can cause named to terminate unexpectedly when synth-from-dnssec is
CVE-2023-2828 7.5 HIGH named's configured cache size limit can be significantly exceeded

IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC

V. Comments for CVE-2023-2911

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