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Vulnerability Details : CVE-2021-25216

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.
Publish Date : 2021-04-29 Last Update Date : 2021-06-07
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Execute CodeOverflow
CWE ID 617

- Products Affected By CVE-2021-25216

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
2 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
3 Application ISC Bind * * * * Version Details Vulnerabilities
4 Application ISC Bind 9.9.3 S1 * * Version Details Vulnerabilities
5 Application ISC Bind 9.9.12 S1 * * Version Details Vulnerabilities
6 Application ISC Bind 9.9.13 S1 * * Version Details Vulnerabilities
7 Application ISC Bind 9.10.5 S1 * * Version Details Vulnerabilities
8 Application ISC Bind 9.10.7 S1 * * Version Details Vulnerabilities
9 Application ISC Bind 9.11.3 S1 * * Version Details Vulnerabilities
10 Application ISC Bind 9.11.5 S3 * * Version Details Vulnerabilities
11 Application ISC Bind 9.11.5 S5 * * Version Details Vulnerabilities
12 Application ISC Bind 9.11.5 S6 * * Version Details Vulnerabilities
13 Application ISC Bind 9.11.6 S1 * * Version Details Vulnerabilities
14 Application ISC Bind 9.11.7 S1 * * Version Details Vulnerabilities
15 Application ISC Bind 9.11.8 S1 * * Version Details Vulnerabilities
16 Application ISC Bind 9.11.12 S1 * * Version Details Vulnerabilities
17 Application ISC Bind 9.11.21 S1 * * Version Details Vulnerabilities
18 Application ISC Bind 9.11.27 S1 * * Version Details Vulnerabilities
19 Application ISC Bind 9.11.29 S1 * * Version Details Vulnerabilities
20 Application ISC Bind 9.16.8 S1 * * Version Details Vulnerabilities
21 Application ISC Bind 9.16.11 S1 * * Version Details Vulnerabilities
22 Application ISC Bind 9.16.13 S1 * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 2
ISC Bind 20

- References For CVE-2021-25216 CONFIRM
MLIST [oss-security] 20210429 Re: ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216) CONFIRM
MLIST [debian-lts-announce] 20210504 [SECURITY] [DLA 2647-1] bind9 security update
MLIST [oss-security] 20210428 ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)
MLIST [oss-security] 20210429 Re: ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)
MLIST [oss-security] 20210429 Re: ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216)

- Metasploit Modules Related To CVE-2021-25216

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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