CVE-2011-4120

CRITICAL EPSS 78.6%
Published Nov 26, 20196y ago · Modified Jun 16, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Nov 26, 2019 6y ago
Last Modified Jun 16, 2026 2w ago

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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
78.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-20 Improper Input Validation Validation

Affected Products 5

VendorProductVersionRange
yubicopam_module* <2.10
linuxlinux_kernel*any
debiandebian_linux8.0any
debiandebian_linux9.0any
debiandebian_linux10.0any

References 4

  • access.redhat.com https://access.redhat.com/security/cve/cve-2011-4120
    Broken LinkThird Party Advisory
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120
    Issue TrackingPatchThird Party Advisory
  • security-tracker.debian.org https://security-tracker.debian.org/tracker/CVE-2011-4120
    Third Party Advisory
  • openwall.com https://www.openwall.com/lists/oss-security/2011/11/07/6
    Mailing ListThird Party Advisory

Remediation

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4120
    Issue TrackingPatchThird Party Advisory