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Gentoo Linux Security Advisory                           GLSA 202402-13
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                                           https://security.gentoo.org/
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 Severity: High
    Title: TACACS+: Remote Code Execution
     Date: February 18, 2024
     Bugs: #918536
       ID: 202402-13

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Synopsis
========

A vulnerability has been discovered in TACACS+ which could lead to
remote code execution.

Background
==========

An updated version of Cisco's TACACS+ server.

Affected packages
=================

Package           Vulnerable       Unaffected
----------------  ---------------  ------------
net-nds/tac_plus  <= 4.0.4.27a-r3  Vulnerable!

Description
===========

A vulnerabilitiy has been discovered in TACACS+. Please review the CVE
identifier referenced below for details.

Impact
======

A lack of input validation exists in tac_plus which, when pre or post
auth commands are enabled, allows an attacker who can control the
username, rem-addr, or NAC address sent to tac_plus to inject shell
commands and gain remote code execution on the tac_plus server.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

Gentoo has discontinued support for TACACS+. We recommend that users
unmerge it:

  # emerge --ask --depclean "net-nds/tac_plus"

References
==========

[ 1 ] CVE-2023-45239
      https://nvd.nist.gov/vuln/detail/CVE-2023-45239

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/202402-13

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2024 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5/