Vulnerability Details

ISC BIND Buffer Overflow Vulnerability (CVE-2021-25216) - Linux

Published: 2021-04-30 03:33:10
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:H/Au:N/C:C/I:C/A:C

Detection Type:
Remote Banner Unreliable

Solution Type:
Vendor Patch

Summary:
ISC BIND is prone to a buffer overflow vulnerability.

Detection Method:
Checks if a vulnerable version is present on the target host.

Technical Details:
GSS-TSIG is an extension to the TSIG protocol which is intended to support the secure exchange of keys for use in verifying the authenticity of communications between parties on a network. SPNEGO is a negotiation mechanism used by GSSAPI, the application protocol interface for GSS-TSIG. The SPNEGO implementation used by BIND has been found to be vulnerable to a buffer overflow attack.

Impact:
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.

Affected Versions:
BIND 9.5.0 through 9.11.29, 9.12.0 through 9.16.13, 9.11.3-S1 through 9.11.29-S1, 9.16.8-S1 through 9.16.13-S1 and 9.17.0 through 9.17.1.

Recommendations:
Update to version 9.11.31, 9.16.15, 9.17.2, 9.11.31-S1, 9.16.15-S1 or later.

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2021-25216

References:

https://kb.isc.org/docs/cve-2021-25216

Severity
High
CVSS Score
7.6
Published
2021-04-30
Modified
2021-04-30
Category
Buffer overflow

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