Vulnerability Name:

CVE-2021-25218 (CCN-207768)

Assigned:2021-08-18
Published:2021-08-18
Updated:2021-09-16
Summary: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.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-617
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-25218

Source: MLIST
Type: Mailing List, Patch, Third Party Advisory
[oss-security] 20210818 ISC has disclosed a vulnerability in BIND (CVE-2021-25218)

Source: MLIST
Type: Mailing List, Patch, Third Party Advisory
[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)

Source: XF
Type: UNKNOWN
isc-bind-cve202125218-dos(207768)

Source: CCN
Type: ISC Web site
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

Source: CONFIRM
Type: Exploit, Vendor Advisory
https://kb.isc.org/v1/docs/cve-2021-25218

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-fbb258debf

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20210909-0002/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:isc:bind:9.16.19:*:*:*:-:*:*:*
  • OR cpe:/a:isc:bind:9.17.16:*:*:*:-:*:*:*
  • OR cpe:/a:isc:bind:9.17.16:s1:*:*:supported_preview:*:*:*

    • Configuration 2:
  • cpe:/o:fedoraproject:fedora:34:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:isc:bind:9.16.9:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:7450
    P
    		bind-utils-9.16.38-150400.5.20.2 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:3469
    P
    		davfs2-1.5.2-2.3 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:94507
    P
    		bind-utils-9.16.20-150400.3.6 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95099
    P
    		bind-9.16.20-150400.3.6 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:2877
    P
    		bind-utils-9.16.20-150400.3.6 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:112004
    P
    		bind-9.16.20-1.4 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:105563
    P
    		bind-9.16.20-1.4 on GA media (Moderate)
    2021-10-01
    BACK
    isc bind 9.16.19
    isc bind 9.17.16
    isc bind 9.17.16 s1
    fedoraproject fedora 34
    isc bind 9.16.9