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CVE-2022-2795— Processing large delegations may severely degrade resolver performance

Quick assessment

Affected
ISC BIND9
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 9.16.33之前版本、9.18.7之前的9.18.x版本、9.19.5之前的9.19.x版本存在安全漏洞，该漏洞源于解析器代码中的缺陷可能会导致命名在处理大型委托上花费过多的时间,攻击者通过利用此漏洞向目标解析器充斥查询，可以显着削弱解析器的性能，从而有效地拒绝合法客户端访问DNS解析服务。

CVSS 5.3 · Medium EPSS 2.20% · P82

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2022-2795

Vulnerability Information
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Vulnerability Title
Processing large delegations may severely degrade resolver performance
Source: CVE Program / CVE List V5
Vulnerability Description
By flooding the target resolver with queries exploiting this flaw an attacker can significantly impair the resolver's performance, effectively denying legitimate clients access to the DNS resolution service.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 资源管理错误漏洞
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 9.16.33之前版本、9.18.7之前的9.18.x版本、9.19.5之前的9.19.x版本存在安全漏洞，该漏洞源于解析器代码中的缺陷可能会导致命名在处理大型委托上花费过多的时间,攻击者通过利用此漏洞向目标解析器充斥查询，可以显着削弱解析器的性能，从而有效地拒绝合法客户端访问DNS解析服务。
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 BIND9 Open Source Branches 9.0 through 9.16 9.0.0 through versions before 9.16.33 -

II. Public POCs for CVE-2022-2795

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III. Intelligence Information for CVE-2022-2795

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Vendor Advisories for CVE-2022-2795 (2)

Mailing List Discussions for CVE-2022-2795 (5)

Other References for CVE-2022-2795 (1)

Same Patch Batch · ISC · 2022-09-21 · 6 CVEs total

CVE-2022-3080 7.5 HIGH BIND 9 resolvers configured to answer from stale cache with zero stale-answer-client-timeo
CVE-2022-38178 7.5 HIGH Memory leaks in EdDSA DNSSEC verification code
CVE-2022-38177 7.5 HIGH Memory leak in ECDSA DNSSEC verification code
CVE-2022-2906 7.5 HIGH Memory leaks in code handling Diffie-Hellman key exchange via TKEY RRs (OpenSSL 3.0.0+ onl
CVE-2022-2881 5.5 MEDIUM Buffer overread in statistics channel code

IV. Related Vulnerabilities

Same product: BIND9
Same vendor: ISC

V. Comments for CVE-2022-2795

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