9.8
CRITICAL
CVE-2021-25216
" BIND GSS-TSIG SPNEGO Buffer Over-Read/Overflow Vulnerability"
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.

INFO

Published Date :

April 29, 2021, 1:15 a.m.

Last Modified :

May 3, 2022, 4:04 p.m.

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2021-25216 has a 9 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-25216 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Netapp active_iq_unified_manager
2 Netapp cloud_backup
3 Netapp h300s_firmware
4 Netapp h500s_firmware
5 Netapp h700s_firmware
6 Netapp h410s_firmware
7 Netapp h300e_firmware
8 Netapp h500e_firmware
9 Netapp h700e_firmware
10 Netapp aff_a250_firmware
11 Netapp aff_500f_firmware
1 Debian debian_linux
1 Siemens sinec_infrastructure_network_services
1 Isc bind
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-25216.

URL Resource
http://www.openwall.com/lists/oss-security/2021/04/29/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/29/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/29/3 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/29/4 Mailing List Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch Third Party Advisory
https://kb.isc.org/v1/docs/cve-2021-25215 Not Applicable
https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html Mailing List Third Party Advisory
https://security.netapp.com/advisory/ntap-20210521-0006/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4909 Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-657/ Third Party Advisory VDB Entry

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

None

Emacs Lisp Makefile C Shell Roff HTML C++ XSLT Perl Python

Updated: 3 months, 4 weeks ago
0 stars 0 fork 0 watcher
Born at : July 6, 2024, 9:22 a.m. This repo has been linked 35 different CVEs too.

None

Updated: 7 months, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : March 10, 2024, 12:15 p.m. This repo has been linked 170 different CVEs too.

None

Updated: 1 year, 2 months ago
0 stars 0 fork 0 watcher
Born at : Aug. 9, 2023, 12:16 p.m. This repo has been linked 170 different CVEs too.

None

Updated: 1 year, 4 months ago
0 stars 0 fork 0 watcher
Born at : June 30, 2023, 4:18 p.m. This repo has been linked 170 different CVEs too.

None

Updated: 1 year, 6 months ago
1 stars 0 fork 0 watcher
Born at : April 10, 2023, 5:46 p.m. This repo has been linked 170 different CVEs too.

Уязвимости и атаки на информационные системы

Updated: 8 months, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : March 24, 2023, 8:20 a.m. This repo has been linked 170 different CVEs too.

None

Updated: 1 year, 7 months ago
0 stars 2 fork 2 watcher
Born at : March 12, 2023, 3:01 a.m. This repo has been linked 170 different CVEs too.

None

Updated: 1 year, 8 months ago
0 stars 0 fork 0 watcher
Born at : Feb. 13, 2023, 5:42 p.m. This repo has been linked 173 different CVEs too.

None

Python

Updated: 3 years, 5 months ago
0 stars 0 fork 0 watcher
Born at : May 17, 2021, 12:43 p.m. This repo has been linked 1 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-25216 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-25216 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CWE Remap by [email protected]

    May. 03, 2022

    Action Type Old Value New Value
    Changed CWE CWE-190 CWE-125
  • Modified Analysis by [email protected]

    Apr. 25, 2022

    Action Type Old Value New Value
    Changed Reference Type https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf No Types Assigned https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
    Changed Reference Type https://security.netapp.com/advisory/ntap-20210521-0006/ No Types Assigned https://security.netapp.com/advisory/ntap-20210521-0006/ Third Party Advisory
    Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-657/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-657/ Third Party Advisory, VDB Entry
    Removed CWE NIST CWE-617
    Added CWE NIST CWE-190
    Added CPE Configuration OR *cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.1
    Added CPE Configuration OR *cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vsphere:*:* *cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:netapp:aff_a250_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:netapp:aff_a250:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:netapp:aff_500f_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:netapp:aff_500f:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:netapp:h300e:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:netapp:h500e:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:netapp:h700e:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Mar. 10, 2022

    Action Type Old Value New Value
    Added Reference https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf [No Types Assigned]
  • CVE Modified by [email protected]

    Jun. 07, 2021

    Action Type Old Value New Value
    Added Reference https://www.zerodayinitiative.com/advisories/ZDI-21-657/ [No Types Assigned]
  • CVE Modified by [email protected]

    May. 21, 2021

    Action Type Old Value New Value
    Added Reference https://security.netapp.com/advisory/ntap-20210521-0006/ [No Types Assigned]
  • Initial Analysis by [email protected]

    May. 12, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type http://www.openwall.com/lists/oss-security/2021/04/29/1 No Types Assigned http://www.openwall.com/lists/oss-security/2021/04/29/1 Mailing List, Third Party Advisory
    Changed Reference Type http://www.openwall.com/lists/oss-security/2021/04/29/2 No Types Assigned http://www.openwall.com/lists/oss-security/2021/04/29/2 Mailing List, Third Party Advisory
    Changed Reference Type http://www.openwall.com/lists/oss-security/2021/04/29/3 No Types Assigned http://www.openwall.com/lists/oss-security/2021/04/29/3 Mailing List, Third Party Advisory
    Changed Reference Type http://www.openwall.com/lists/oss-security/2021/04/29/4 No Types Assigned http://www.openwall.com/lists/oss-security/2021/04/29/4 Mailing List, Third Party Advisory
    Changed Reference Type https://kb.isc.org/v1/docs/cve-2021-25215 No Types Assigned https://kb.isc.org/v1/docs/cve-2021-25215 Not Applicable
    Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html Mailing List, Third Party Advisory
    Changed Reference Type https://www.debian.org/security/2021/dsa-4909 No Types Assigned https://www.debian.org/security/2021/dsa-4909 Third Party Advisory
    Added CWE NIST CWE-617
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* versions from (including) 9.0.0 up to (excluding) 9.11.31 *cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.9.12:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.9.13:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.10.5:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.10.7:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.3:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.5:s3:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.5:s5:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.5:s6:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.6:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.7:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.8:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.12:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.21:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.27:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.11.29:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* versions from (including) 9.12.0 up to (excluding) 9.16.15 *cpe:2.3:a:isc:bind:9.16.8:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.16.11:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:9.16.13:s1:*:*:supported_preview:*:*:* *cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* versions from (including) 9.17.0 up to (excluding) 9.17.12
  • CVE Modified by [email protected]

    May. 04, 2021

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html [No Types Assigned]
  • CVE Modified by [email protected]

    May. 01, 2021

    Action Type Old Value New Value
    Added Reference https://www.debian.org/security/2021/dsa-4909 [No Types Assigned]
  • CVE Modified by [email protected]

    Apr. 29, 2021

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2021/04/29/4 [No Types Assigned]
  • CVE Modified by [email protected]

    Apr. 29, 2021

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2021/04/29/2 [No Types Assigned]
    Added Reference http://www.openwall.com/lists/oss-security/2021/04/29/3 [No Types Assigned]
  • CVE Modified by [email protected]

    Apr. 29, 2021

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2021/04/29/1 [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-25216 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-25216 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

44.74 }} 5.96%

score

0.97375

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability