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CVE-2011-4120

9.8 · CRITICAL

Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM configuration option was not used and the module was configured as 'sufficient' in the PAM configuration.

Published Nov 26, 2019CWE-20EPSS 2.02%

Overview

CVE-2011-4120 is a critical-severity vulnerability. It was published on November 26, 2019 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM configuration option was not used and the module was configured as 'sufficient' in the PAM configuration. A remote attacker could use this flaw to circumvent common authentication process and obtain access to the account in question by providing a NULL value (pressing Ctrl-D keyboard sequence) as the password string.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/security/cve/cve-2011-4120Refbugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120Refsecurity-tracker.debian.org/tracker/CVE-2011-4120Refwww.openwall.com/lists/oss-security/2011/11/07/6Refaccess.redhat.com/security/cve/cve-2011-4120Refbugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120Refsecurity-tracker.debian.org/tracker/CVE-2011-4120Refwww.openwall.com/lists/oss-security/2011/11/07/6

How CyberStrike helps

Frequently asked questions

What is CVE-2011-4120?

CVE-2011-4120 is a critical-severity vulnerability. It was published on November 26, 2019 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2011-4120?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2011-4120?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2011-4120?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-4120 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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