CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
EPSS
Percentile
42.2%
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.
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.
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.
Install a new CA certificate
The vendor recommends the following steps be taken to address this vulnerability.
Endpoints should not trust the self-signed Fortigate CA certificate. The following certificate information is for the certificate that should be distrusted:
Subject: "E = [email protected]; 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
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Notified: September 07, 2012 Updated: October 30, 2012
Affected
We have not received a statement from the vendor.
We are not aware of further vendor information regarding this vulnerability.
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 |
Thanks to Bitwiper for reporting this vulnerability.
This document was written by Jared Allar.
CVE IDs: | CVE-2012-4948 |
---|---|
Date Public: | 2012-10-22 Date First Published: |
docs.fortinet.com/fos40hlp/43/wwhelp/wwhimpl/common/html/wwhelp.htm?context=fgt&file=misc_utm_chapter.61.13.html
docs.fortinet.com/fos40hlp/43/wwhelp/wwhimpl/js/html/wwhelp.htm
kb.fortinet.com/kb/viewContent.do?externalId=FD32404
www.fortinet.com/solutions/unified_threat_management.html
media.torproject.org/misc/2012-07-03-cyberoam-CVE-2012-3372.txt