[ GLSA 202409-23 ] ZNC: Remote Code Execution

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Gentoo Linux Security Advisory                           GLSA 202409-23
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: ZNC: Remote Code Execution
     Date: September 24, 2024
     Bugs: #935422
       ID: 202409-23

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Synopsis
========

A vulnerability has been found in ZNC which could result in remote code
execution.

Background
==========

ZNC is an advanced IRC bouncer.

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

Package      Vulnerable    Unaffected
-----------  ------------  ------------
net-irc/znc  < 1.9.1       >= 1.9.1

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

ZNC's modtcl could allow for remote code execution via a KICK.

Impact
======

A vulnerable ZNC with the modtcl module loaded could be exploited for
remote code execution.

Workaround
==========

Unload the mod_tcl module.

Resolution
==========

All ZNC users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-irc/znc-1.9.1"

References
==========

[ 1 ] CVE-2024-39844
      https://nvd.nist.gov/vuln/detail/CVE-2024-39844

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

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

 https://security.gentoo.org/glsa/202409-23

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
[email protected] 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
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