CVE-2021-25216

Common vulnerabilities & exposures (CVE)

CVE database CVE database blogpost Release & EoL database

Published at: - 29-04-2021 03:15

Last modified: - 25-04-2022 10:02

Total changes: - 6

Description

In BIND 9.5.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.11.3-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 -> 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Low

Attack complexity

Network

Attack vector

High

Availability

High

Confidentiality

High

Integrity

None

Privileges required

Unchanged

Scope

None

User interaction

9.8

Base score

3.9

5.9

Exploitability score

Impact score

Verification logic

vendor=Debian AND product=debian_linux AND version=9.0

vendor=Debian AND product=debian_linux AND version=10.0

vendor=isc AND product=bind AND software_edition=- AND versionStartIncluding=9.0.0 AND versionEndExcluding=9.11.31

vendor=isc AND product=bind AND version=9.9.3 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.9.12 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.9.13 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.10.5 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.10.7 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.3 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.5 AND update=s3 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.5 AND update=s5 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.5 AND update=s6 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.6 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.7 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.8 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.12 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.21 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.27 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.11.29 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND software_edition=- AND versionStartIncluding=9.12.0 AND versionEndExcluding=9.16.15

vendor=isc AND product=bind AND version=9.16.8 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.16.11 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND version=9.16.13 AND update=s1 AND software_edition=supported_preview

vendor=isc AND product=bind AND software_edition=- AND versionStartIncluding=9.17.0 AND versionEndExcluding=9.17.12

vendor=siemens AND product=sinec_infrastructure_network_services AND versionEndExcluding=1.0.1.1

vendor=netapp AND product=active_iq_unified_manager AND version=- AND target_software=vsphere

vendor=netapp AND product=cloud_backup AND version=-

AND

vendor=netapp AND product=aff_a250_firmware AND version=-

vendor=netapp AND product=aff_a250 AND version=-

AND

vendor=netapp AND product=aff_500f_firmware AND version=-

vendor=netapp AND product=aff_500f AND version=-

AND

vendor=netapp AND product=h300s_firmware AND version=-

vendor=netapp AND product=h300s AND version=-

AND

vendor=netapp AND product=h500s_firmware AND version=-

vendor=netapp AND product=h500s AND version=-

AND

vendor=netapp AND product=h700s_firmware AND version=-

vendor=netapp AND product=h700s AND version=-

AND

vendor=netapp AND product=h300e_firmware AND version=-

vendor=netapp AND product=h300e AND version=-

AND

vendor=netapp AND product=h500e_firmware AND version=-

vendor=netapp AND product=h500e AND version=-

AND

vendor=netapp AND product=h700e_firmware AND version=-

vendor=netapp AND product=h700e AND version=-

AND

vendor=netapp AND product=h410s_firmware AND version=-

vendor=netapp AND product=h410s AND version=-

Reference

https://kb.isc.org/v1/docs/cve-2021-25215
[oss-security] 20210428 ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)-Mailing List, Third Party Advisory
[oss-security] 20210429 Re: ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)-Mailing List, Third Party Advisory
[oss-security] 20210429 Re: ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)-Mailing List, Third Party Advisory
[oss-security] 20210429 Re: ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)-Mailing List, Third Party Advisory
DSA-4909-Third Party Advisory
[debian-lts-announce] 20210504 [SECURITY] [DLA 2647-1] bind9 security update-Mailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210521-0006/
https://www.zerodayinitiative.com/advisories/ZDI-21-657/
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf

Keywords

CVE-2021-25216

Common vulnerabilities & exposures (CVE)

Description

Common Vulnerability Scoring System (CVSS)

Verification logic

Reference

NVD

CVE-2021-25216

CVE

Common vulnerabilities & exposures

CVSS

Common vulnerability scoring system

Security

Vulnerabilities

Exposures