Fortigate UTM appliances: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.1062
      Fortigate UTM appliances share the same default CA certificate
                              7 November 2012

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:          Fortigate UTM appliances
Publisher:        US-CERT
Operating System: Network Appliance
Impact/Access:    Provide Misleading Information -- Remote/Unauthenticated
                  Access Privileged Data         -- Remote/Unauthenticated
Resolution:       Mitigation
CVE Names:        CVE-2012-4948 CVE-2012-3372 

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Vulnerability Note VU#111708
Fortigate UTM appliances share the same default CA certificate

Original Release date: 02 Nov 2012 | Last revised: 02 Nov 2012

Overview

Fortigate UTM appliances that support SSL/TLS deep packet inspection share the 
same self-signed Fortigate CA certificate and associated private key across all 
devices. The private key, which has been compromised, allows attackers to 
create and sign fake certificates.

Description

Fortigate UTM appliances share the same self-signed Fortigate CA certificate. 
Companies that use these appliances for deep packet inspection will have most 
likely deployed the CA certificate to endpoint web browsers so certificate 
warnings will not be seen by an end-user. Since the associated private key has 
been compromised (published on the web), an attacker with a man-in-the-middle 
vantage point on the network will be able to simulate the behavior of the 
Fortigate appliance and eavesdrop on encrypted communications or spoof 
websites. Also, the attacker may digitally sign malicious software, spoofing 
the identity of the publisher.

Impact

Primarily at risk are users who have imported the compromised Fortigate CA 
certificate into their web browser or operating system. This risk applies 
equally within the company (connected to a network behind the Fortigate UTM 
appliance) as anywhere else. An attacker with a man-in-the-middle vantage point 
on the current network may be able to eavesdrop on encrypted communications. 
In addition, an attacker may falsify digital signatures such as Authenticode.

Solution

Install a new CA certificate

The vendor recommends the following steps be taken to address this 
vulnerability.

    Admin creates/obtains a CA certificate for which only they have the private 
    key.
    Admin installs the CA certificate on FortiGate.
    Admin uses "set caname xxx" to select that certificate for SSL deep 
    inspection.

Disable the Fortigate CA certificate

Endpoints should not trust the self-signed Fortigate CA certificate. The 
following certificate information is for the certificate that should be 
distrusted:

Subject: "E = support@fortinet.com; CN = FortiGate CA; OU = Certificate 
Authority; O = Fortinet; L = Sunnyvale; S = California; C = US";
Thumbprint: 3e 20 7f 9a 6b d9 5c 7c 2b 89 11 67 d3 2f 57 87 2f 76 60 14

The preferrable way to distrust a CA certificate is to import it to the 
"Untrusted certificates" branch of the system certificate store. To continue 
the use of SSL/TLS deep packet inspection, a new, unique, CA certificate may 
be generated and imported into the Fortigate UTM appliance. To prevent users 
from experiencing certificate errors, that new CA certificate can be imported 
into web browsers. Chapter 6 of the FortiOS handbook contains instructions on 
how to replace the default CA certificate.

Vendor Information (Learn More)
Vendor			Status		Date Notified	Date Updated
Fortinet, Inc.		Affected	07 Sep 2012	30 Oct 2012

If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)
Group 		Score 	Vector
Base 		4.6 	AV:A/AC:H/Au:N/C:C/I:N/A:N
Temporal 	3.7 	E:F/RL:W/RC:UC
Environmental 	3.7 	CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND

References

    http://docs.fortinet.com/fos40hlp/43/wwhelp/wwhimpl/common/html/wwhelp.htm?context=fgt&file=misc_utm_chapter.61.13.html
    http://kb.fortinet.com/kb/viewContent.do?externalId=FD32404
    http://www.fortinet.com/solutions/unified_threat_management.html
    https://media.torproject.org/misc/2012-07-03-cyberoam-CVE-2012-3372.txt
    http://docs.fortinet.com/fos40hlp/43/wwhelp/wwhimpl/js/html/wwhelp.htm

Credit

Thanks to Bitwiper for reporting this vulnerability.

This document was written by Jared Allar.
Other Information

    CVE IDs: CVE-2012-4948
    Date Public: 22 Oct 2012
    Date First Published: 02 Nov 2012
    Date Last Updated: 02 Nov 2012
    Document Revision: 19

Feedback

If you have feedback, comments, or additional information about this 
vulnerability, please send us email.

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