CVE-2011-4120

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.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.47% Top 25%
Third-Party Advisory redhat.com Third-Party Advisory redhat.com Third-Party Advisory debian.org Third-Party Advisory openwall.com
Affected: yubico-pam yubico-pam
Published at:
Updated at:

References

Link Tags
https://security-tracker.debian.org/tracker/CVE-2011-4120 third party advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120 patch third party advisory issue tracking
https://access.redhat.com/security/cve/cve-2011-4120 third party advisory broken link
https://www.openwall.com/lists/oss-security/2011/11/07/6 third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2011-4120?
CVE-2011-4120 has been scored as a critical severity vulnerability.
How to fix CVE-2011-4120?
To fix CVE-2011-4120, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2011-4120 being actively exploited in the wild?
It is possible that CVE-2011-4120 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2011-4120?
CVE-2011-4120 affects yubico-pam yubico-pam.
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