CVE-2011-4120

moderate-risk
Published 2019-11-26

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.

Do I need to act?

~
1.5% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (4)

Pam Module

Affected Vendors

Debian Yubico

References (8)

Broken Link https://access.redhat.com/security/cve/cve-2011-4120
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120
Third Party Advisory https://security-tracker.debian.org/tracker/CVE-2011-4120
Mailing List https://www.openwall.com/lists/oss-security/2011/11/07/6
Broken Link https://access.redhat.com/security/cve/cve-2011-4120
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120
Third Party Advisory https://security-tracker.debian.org/tracker/CVE-2011-4120
Mailing List https://www.openwall.com/lists/oss-security/2011/11/07/6
46
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 4/34 · Minimal
Exposure 10/34 · Low