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.
References (4)
Core 4
Core References
Third Party Advisory x_refsource_misc
https://security-tracker.debian.org/tracker/CVE-2011-4120
Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120
Broken Link, Third Party Advisory x_refsource_misc
https://access.redhat.com/security/cve/cve-2011-4120
Mailing List, Third Party Advisory x_refsource_misc
https://www.openwall.com/lists/oss-security/2011/11/07/6
Scores
CVSS v3
9.8
EPSS
0.0202
EPSS Percentile
78.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-20
Status
published
Products (4)
debian/debian_linux
8.0
debian/debian_linux
9.0
debian/debian_linux
10.0
yubico/pam_module
< 2.10
Published
Nov 26, 2019
Tracked Since
Feb 18, 2026