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Gentoo Linux Security Advisory GLSA 202012-06
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https://security.gentoo.org/
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Severity: Normal
Title: Linux-PAM: Authentication bypass
Date: December 07, 2020
Bugs: #756361
ID: 202012-06
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Synopsis
========
A vulnerability has been found in Linux-PAM, allowing attackers to
bypass the authentication process.
Background
==========
Linux-PAM (Pluggable Authentication Modules) is an architecture
allowing the separation of the development of privilege granting
software from the development of secure and appropriate authentication
schemes.
Affected packages
=================
——————————————————————-
Package / Vulnerable / Unaffected
——————————————————————-
1 sys-libs/pam < 1.5.1 >= 1.5.1
Description
===========
A flaw was found in Linux-Pam in the way it handle empty passwords for
non-existing users.
Impact
======
A remote attacker, who only needs to know a non-existing username,
could bypass security restrictions and authenticate as root user.
Workaround
==========
Ensure that root account is protected by a non-empty password.
Resolution
==========
All Linux-PAM users should upgrade to the latest version:
# emerge –sync
# emerge –ask –oneshot –verbose “>=sys-libs/pam-1.5.1”
References
==========
[ 1 ] CVE-2020-27780
https://nvd.nist.gov/vuln/detail/CVE-2020-27780
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/202012-06
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 2020 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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