Fortinet FortiOS < 4.3.13 SSL-VPN TLS MAC Spoofing

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote host is affected by a man-in-the-middle spoofing
vulnerability.

Description :

The remote host is running a version of FortiOS prior to 4.3.13. It
is, therefore, affected by a man-in-the-middle spoofing vulnerability
due to a flaw in the SSL-VPN feature. The SSL-VPN feature only
validates the first byte of the TLS MAC in finished messages. A
remote, man-in-the-middle attacker can exploit this, via a crafted
MAC field, to spoof encrypted content, potentially resulting in the
disclosure of sensitive information.

See also :

https://forum.fortinet.com/tm.aspx?m=96828
https://forum.fortinet.com/tm.aspx?m=97337
http://www.nessus.org/u?f1fdeac2

Solution :

Upgrade to Fortinet FortiOS 4.3.14 or later.

Note that version 4.3.13 contained the earliest fix; however, that
version contained an unrelated error and was removed from
distribution.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N)
CVSS Temporal Score : 4.1
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Firewalls

Nessus Plugin ID: 85806 ()

Bugtraq ID: 76065

CVE ID: CVE-2015-5965

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