CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:N/I:P/A:N
EPSS
Percentile
77.6%
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.
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(85806);
script_version("1.4");
script_cvs_date("Date: 2018/07/11 17:09:25");
script_cve_id("CVE-2015-5965");
script_bugtraq_id(76065);
script_name(english:"Fortinet FortiOS < 4.3.13 SSL-VPN TLS MAC Spoofing");
script_summary(english:"Checks the version of FortiOS.");
script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a man-in-the-middle spoofing
vulnerability.");
script_set_attribute(attribute:"description", value:
"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.");
# 4.3.13 release notice
script_set_attribute(attribute:"see_also",value:"https://forum.fortinet.com/tm.aspx?m=96828");
# 4.3.14 release notice
script_set_attribute(attribute:"see_also",value:"https://forum.fortinet.com/tm.aspx?m=97337");
# https://web.archive.org/web/20150715013228/https://vivaldi.net/en-US/blogs/entry/the-poodle-has-friends
script_set_attribute(attribute:"see_also",value:"http://www.nessus.org/u?f1fdeac2");
script_set_attribute(attribute:"solution", value:
"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.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2015/07/14");
script_set_attribute(attribute:"patch_publication_date", value:"2013/04/30");
script_set_attribute(attribute:"plugin_publication_date", value:"2015/09/04");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:fortinet:fortios");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Firewalls");
script_copyright(english:"This script is Copyright (C) 2015-2018 Tenable Network Security, Inc.");
script_dependencies("fortinet_version.nbin");
script_require_keys("Host/Fortigate/model", "Host/Fortigate/version", "Host/Fortigate/build", "Settings/ParanoidReport");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
app_name = "FortiOS";
model = get_kb_item_or_exit("Host/Fortigate/model");
version = get_kb_item_or_exit("Host/Fortigate/version");
build = get_kb_item_or_exit("Host/Fortigate/build");
vuln = FALSE;
# Make sure device is FortiGate
if (!preg(string:model, pattern:"fortigate", icase:TRUE)) audit(AUDIT_OS_NOT, app_name);
if (report_paranoia < 2) audit(AUDIT_PARANOID);
if (version =~ "^4\.")
{
fix = "4.3.13";
fix_build = 664;
}
else audit(AUDIT_INST_VER_NOT_VULN, app_name, version);
# If build number is available, this is the safest comparison.
# Otherwise compare version numbers.
if (build !~ "Unknown")
{
if (int(build) < fix_build) vuln = TRUE;
report_build = build;
}
else if (ver_compare(ver:version, fix:fix, strict:FALSE) == -1) vuln = TRUE;
if (vuln)
{
if (report_verbosity > 0)
{
report =
'\n Model : ' + model +
'\n Installed version : ' + version +
'\n Fixed version : 4.3.14';
if (!empty_or_null(report_build))
report +=
'\n Installed build : ' + report_build +
'\n Fixed build : ' + fix_build;
report += '\n';
security_warning(extra:report, port:0);
}
else security_warning(port:0);
exit(0);
}
else audit(AUDIT_INST_VER_NOT_VULN, app_name, version);