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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 |
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Title: Linux-PAM: Authentication bypass |
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Date: December 07, 2020 |
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Bugs: #756361 |
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ID: 202012-06 |
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Synopsis |
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======== |
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|
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A vulnerability has been found in Linux-PAM, allowing attackers to |
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bypass the authentication process. |
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Background |
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========== |
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|
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Linux-PAM (Pluggable Authentication Modules) is an architecture |
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allowing the separation of the development of privilege granting |
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software from the development of secure and appropriate authentication |
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schemes. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 sys-libs/pam < 1.5.1 >= 1.5.1 |
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|
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Description |
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=========== |
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|
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A flaw was found in Linux-Pam in the way it handle empty passwords for |
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non-existing users. |
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|
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Impact |
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====== |
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|
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A remote attacker, who only needs to know a non-existing username, |
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could bypass security restrictions and authenticate as root user. |
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Workaround |
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========== |
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|
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Ensure that root account is protected by a non-empty password. |
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Resolution |
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========== |
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All Linux-PAM users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=sys-libs/pam-1.5.1" |
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|
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References |
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========== |
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[ 1 ] CVE-2020-27780 |
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https://nvd.nist.gov/vuln/detail/CVE-2020-27780 |
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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https://security.gentoo.org/glsa/202012-06 |
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|
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users' machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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https://bugs.gentoo.org. |
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|
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License |
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======= |
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Copyright 2020 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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https://creativecommons.org/licenses/by-sa/2.5 |
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