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CVE-2021-25215— An assertion check can fail while answering queries for DNAME records that require the DNAME to be processed to resolve itself

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。 ISC BIND 存在安全漏洞，该漏洞源于回答DNAME的查询时,断言检查可能会失败 需要处理DNAME才能解决的记录。

CVSS 7.5 · High EPSS 11.39% · P96

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-25215

Vulnerability Information
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Vulnerability Title
An assertion check can fail while answering queries for DNAME records that require the DNAME to be processed to resolve itself
Source: CVE Program / CVE List V5
Vulnerability Description
In BIND 9.0.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a query for a record triggering the flaw described above, the named process will terminate due to a failed assertion check. The vulnerability affects all currently maintained BIND 9 branches (9.11, 9.11-S, 9.16, 9.16-S, 9.17) as well as all other versions of BIND 9.
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，该漏洞源于回答DNAME的查询时,断言检查可能会失败 需要处理DNAME才能解决的记录。
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 9.11 9.0.0 through versions before 9.11.30 -

II. Public POCs for CVE-2021-25215

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III. Intelligence Information for CVE-2021-25215

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Vendor Advisories for CVE-2021-25215 (4)

Mailing List Discussions for CVE-2021-25215 (6)

Other References for CVE-2021-25215 (1)

Same Patch Batch · ISC · 2021-04-29 · 3 CVEs total

CVE-2021-25216 8.1 HIGH A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a b
CVE-2021-25214 6.5 MEDIUM A broken inbound incremental zone update (IXFR) can cause named to terminate unexpectedly

IV. Related Vulnerabilities

Same product: BIND9
Same vendor: ISC

V. Comments for CVE-2021-25215

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