CVE-2021-25218

Published on: 08/18/2021 12:00:00 AM UTC

Last Modified on: 09/16/2021 12:30:00 PM UTC

CVE-2021-25218

Source: Mitre Source: NIST CVE.ORG Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Certain versions of Fedora from Fedoraproject contain the following vulnerability:

In BIND 9.16.19, 9.17.16. Also, version 9.16.19-S1 of BIND Supported Preview Edition When a vulnerable version of named receives a query under the circumstances described above, the named process will terminate due to a failed assertion check. The vulnerability affects only BIND 9 releases 9.16.19, 9.17.16, and release 9.16.19-S1 of the BIND Supported Preview Edition.

  • CVE-2021-25218 has been assigned by URL Logo security-[email protected] to track the vulnerability - currently rated as HIGH severity.
  • We are not aware of any active exploits, but the conditions triggering the crash can occur during normal operations
  • Affected Vendor/Software: URL Logo ISC - BIND9 version = 9.16.19
  • Affected Vendor/Software: URL Logo ISC - BIND9 version = 9.17.16
  • Affected Vendor/Software: URL Logo ISC - BIND9 version = 9.16.19-S1
Vulnerability Patch/Work Around
  • Disabling RRL in all views, including the built-in CHAOS class view "_bind", prevents the faulty assertion from being reached. This can be done by removing all existing rate-limit statements from named.conf, and defining a replacement for the default CHAOS view: view override_bind chaos { recursion no; notify no; allow-new-zones no; max-cache-size 2M; zone "version.bind" chaos { type primary; database "_builtin version"; }; zone "hostname.bind" chaos { type primary; database "_builtin hostname"; }; zone "authors.bind" chaos { type primary; database "_builtin authors"; }; zone "id.server" chaos { type primary; database "_builtin id"; }; };

CVSS3 Score: 7.5 - HIGH

Attack
Vector ⓘ		 Attack
Complexity		 Privileges
Required		 User
Interaction
NETWORK LOW NONE NONE
Scope Confidentiality
Impact		 Integrity
Impact		 Availability
Impact
UNCHANGED NONE NONE HIGH

CVSS2 Score: 5 - MEDIUM

Access
Vector ⓘ		 Access
Complexity		 Authentication
NETWORK LOW NONE
Confidentiality
Impact		 Integrity
Impact		 Availability
Impact
NONE NONE PARTIAL

CVE References

Description Tags ⓘ Link
CVE-2021-25218: A too-strict assertion check could be triggered when responses in BIND 9.16.19 and 9.17.16 require UDP fragmentation if RRL is in use - Security Advisories kb.isc.org
text/html
 URL Logo CONFIRM kb.isc.org/v1/docs/cve-2021-25218
oss-security - August BIND maintenance releases contain a defect affecting servers using the map zone file format (was: A vulnerability in BIND (CVE-2021-25218) will be announced 18 August 2021) www.openwall.com
text/html
 URL Logo MLIST [oss-security] 20210820 August BIND maintenance releases contain a defect affecting servers using the map zone file format (was: A vulnerability in BIND (CVE-2021-25218) will be announced 18 August 2021)
[SECURITY] Fedora 34 Update: bind-dyndb-ldap-11.9-4.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
text/html
 URL Logo FEDORA FEDORA-2021-fbb258debf
CVE-2021-25218 ISC BIND Vulnerability in NetApp Products | NetApp Product Security security.netapp.com
text/html
 URL Logo CONFIRM security.netapp.com/advisory/ntap-20210909-0002/
oss-security - ISC has disclosed a vulnerability in BIND (CVE-2021-25218) www.openwall.com
text/html
 URL Logo MLIST [oss-security] 20210818 ISC has disclosed a vulnerability in BIND (CVE-2021-25218)
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Related QID Numbers

  • 15127 ISC BIND Assertion Failure Vulnerability
  • 281835 Fedora Security Update for bind (FEDORA-2021-fbb258debf)
  • 500061 Alpine Linux Security Update for bind

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
Operating
System		FedoraprojectFedora34AllAllAll
ApplicationIscBind9.16.19AllAllAll
ApplicationIscBind9.17.16AllAllAll
ApplicationIscBind9.17.16s1AllAll
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*:
  • cpe:2.3:a:isc:bind:9.16.19:*:*:*:-:*:*:*:
  • cpe:2.3:a:isc:bind:9.17.16:*:*:*:-:*:*:*:
  • cpe:2.3:a:isc:bind:9.17.16:s1:*:*:supported_preview:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @fj_twt CVE-2021-25218: A too-strict assertion check could be triggered when responses in BIND 9.16.19 and 9.17.16 require… twitter.com/i/web/status/1… 2021-08-18 17:35:16
Twitter Icon @bind9 New versions of BIND just posted. The 9.16.20 and 9.17.17 releases contain a fix for CVE-2021-25218 (disclosed toda… twitter.com/i/web/status/1… 2021-08-18 17:55:32
Twitter Icon @CVEreport CVE-2021-25218 : In BIND 9.16.19, 9.17.16. Also, version 9.16.19-S1 of BIND Supported Preview Edition When a vulner… twitter.com/i/web/status/1… 2021-08-18 18:26:38
Twitter Icon @yuuturn5 CVE-2021-25218、9.11系のバージョンは影響なしか。RRLって普通使うもんなのかな？ 2021-08-18 18:30:19
Twitter Icon @omokazuki SIOSセキュリティブログを更新しました。 BIND 9の脆弱性情報(High: CVE-2021-25218)と新バージョン(9.11.35, 9.16.20, 9.17.17 ) #sios_tech #security… twitter.com/i/web/status/1… 2021-08-18 19:04:57
Twitter Icon @oss_security ISC has disclosed a vulnerability in BIND (CVE-2021-25218): Posted by Michael McNally on Aug 18On August 18, 2021,… twitter.com/i/web/status/1… 2021-08-18 20:02:02
Twitter Icon @OpenBSD_ports sthen@ modified net/isc-bind: update to bind-9.16.20 CVE-2021-25218: A too-strict assertion check could be triggere… twitter.com/i/web/status/1… 2021-08-18 20:25:24
Reddit Logo Icon /r/Turris Turris OS 5.2.7 is released 2021-09-15 16:56:50
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