Vulnerability identifier: #VU44418

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-4197

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
pfsense
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Rubicon Communications

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

pfsense: 1.0.x - 1.2.3

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External links
http://archives.neohapsis.com/archives/bugtraq/2011-12/0152.html
http://secunia.com/advisories/46780
http://www.osvdb.org/77982
http://www.securityfocus.com/bid/51169
http://exchange.xforce.ibmcloud.com/vulnerabilities/71969
http://github.com/bsdperimeter/pfsense/commit/1379d66f11aaf72982a70287b83e24efcd18898e
http://github.com/bsdperimeter/pfsense/commit/87b4deb2b2dae9013e6aa0fe490d6a5a04a27894
http://www.trustmatta.com/advisories/MATTA-2011-001.txt

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.