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CVE-2021-25219— Lame cache can be abused to severely degrade resolver performance

Quick assessment

Affected
ISC BIND9
Exploitation
High exploitation probability; assess promptly
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。 BIND 中存在资源管理错误漏洞，该漏洞源于产品的授权服务器的相应处理存在错误。攻击者可通过该漏洞导致BIND解析器性能下降进而导致查询处理延迟。

CVSS 5.3 · Medium EPSS 10.58% · P96

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-25219

Vulnerability Information
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Vulnerability Title
Lame cache can be abused to severely degrade resolver performance
Source: CVE Program / CVE List V5
Vulnerability Description
In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.
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。 BIND 中存在资源管理错误漏洞，该漏洞源于产品的授权服务器的相应处理存在错误。攻击者可通过该漏洞导致BIND解析器性能下降进而导致查询处理延迟。
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 9.3 through 9.11 9.3.0 through versions before 9.11.36 -

II. Public POCs for CVE-2021-25219

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III. Intelligence Information for CVE-2021-25219

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Vendor Advisories for CVE-2021-25219 (5)

Mailing List Discussions for CVE-2021-25219 (4)

Other References for CVE-2021-25219 (1)

IV. Related Vulnerabilities

Same product: BIND9
Same vendor: ISC

V. Comments for CVE-2021-25219

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