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Gentoo Linux Security Advisory GLSA 202210-26
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https://security.gentoo.org/
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Severity: Normal
Title: Shadow: TOCTOU Race
Date: October 31, 2022
Bugs: #830486
ID: 202210-26

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Synopsis
========

A TOCTOU race has been discovered in Shadow, which could result in the unauthorized modification of files.

Background
==========

Shadow contains utilities to deal with user accounts

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-apps/shadow < 4.12.2 >= 4.12.2

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

A TOCTOU race condition was discovered in shadow. A local attacker with
write privileges in a directory removed or copied by usermod/userdel
could potentially exploit this flaw when the administrator invokes usermod/userdel.

Impact
======

An unauthorized user could potentially modify files which they do not
have write permissions for.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Shadow users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/shadow-4.12.2"

References
==========

[ 1 ] CVE-2013-4235
https://nvd.nist.gov/vuln/detail/CVE-2013-4235

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

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

https://security.gentoo.org/glsa/202210-26

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 2022 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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