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Gentoo: GLSA-202012-06 Normal: Linux-PAM Authentication Bypass Exploit

gentoo
Calendar Grey December 6, 2020
Dist Gentoo Esm H88
Discover the Gentoo advisory on Linux-PAM's normal severity authentication bypass exploit and its resolution steps.
A vulnerability has been found in Linux-PAM, allowing attackers to bypass the authentication process.

Summary

A flaw was found in Linux-Pam in the way it handle empty passwords for non-existing users.

Topics%20covered

Topics Covered

security advisory Gentoo gentoo authentication bypass normal normal severity linux-pam Linux-PAM

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
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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.

Severity: Normal
Title: Linux-PAM: Authentication bypass
Date: December 07, 2020
Bugs: #756361
ID: 202012-06

Topics%20covered

Topics Covered

security advisory Gentoo gentoo authentication bypass normal normal severity linux-pam Linux-PAM

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.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-libs/pam < 1.5.1 >= 1.5.1

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.

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