#VU81673 Input validation error in Tacacs - CVE-2023-45239

Vulnerability identifier: #VU81673

Vulnerability risk: High

CVSSv4.0: 8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-45239

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Tacacs
Server applications / Directory software, identity management

Vendor: www.shrubbery.net

Description

The vulnerability allows a remote attacker to bypass authentication.

The vulnerability exists due to insufficient validation of username, NAS_name, and NAC_address fields in programs.c. A remote attacker can send specially crafted input to the daemon and potentially bypass authentication.

Mitigation
The vulnerability is fixed in the git repository of Tacacs+ Facebook fork.

Vulnerable software versions

Tacacs: F3.0.13 - 2.2

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2242402
https://github.com/facebook/tac_plus/commit/68ba2a19472da0a3de28c41b7a2e222438dca359

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.