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Last updated: 5/26/2016 8:28:08 AM

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Vulnerability Summary for CVE-2011-4197

Original release date: 01/03/2012
Last revised: 01/03/2012


etc/inc/certs.inc in the PKI implementation in pfSense before 2.0.1 creates each X.509 certificate with a true value for the CA basic constraint, which allows remote attackers to create sub-certificates for arbitrary subjects by leveraging the private key.


CVSS Severity (version 2.0):
CVSS v2 Base Score: 7.5 HIGH
Impact Subscore: 6.4
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service

References to Advisories, Solutions, and Tools

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External Source: CONFIRM
Name: https://github.com/bsdperimeter/pfsense/commit/87b4deb2b2dae9013e6aa0fe490d6a5a04a27894
External Source: MISC
Name: https://www.trustmatta.com/advisories/MATTA-2011-001.txt
External Source: BUGTRAQ
Name: 20111222 [MATTA-2011-001] pfSense x509 Insecure Certificate Creation
External Source: XF
Name: pfsense-x509-security-bypass(71969)
External Source: CONFIRM
Name: https://github.com/bsdperimeter/pfsense/commit/1379d66f11aaf72982a70287b83e24efcd18898e
External Source: BID
Name: 51169

Technical Details

Vulnerability Type (View All)
  • Permissions, Privileges, and Access Control (CWE-264)