ISC BIND Buffer Overflow (CVE-2020-8625)

high Nessus Plugin ID 146595
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Synopsis

The remote name server is affected by a buffer overflow vulnerability.

Description

According to its self-reported version, the ISC Bind present on the remote host is affected by a buffer overflow vulnerability. 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 valid values for the tkey-gssapi-keytab or tkey-gssapi-credentialconfiguration 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. The most likely outcome of a successful exploitation of the vulnerability is a crash of the named process. However, remote code execution, while unproven, is theoretically possible.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to the patched release most closely related to your current version of BIND.

See Also

https://kb.isc.org/v1/docs/cve-2020-8625

Plugin Details

Severity: High

ID: 146595

File Name: bind9_9172_cve-2020-8625.nasl

Version: 1.4

Type: remote

Family: DNS

Published: 2/19/2021

Updated: 4/30/2021

Dependencies: bind_version.nasl

Configuration: Enable paranoid mode

Risk Information

CVSS Score Source: CVE-2020-8625

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:isc:bind

Required KB Items: bind/version, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 2/17/2021

Vulnerability Publication Date: 2/17/2021

Reference Information

CVE: CVE-2020-8625

IAVA: 2021-A-0101-S