Fortinet FortiOS <= 5.4, 5.6.x < 5.6.8, 6.0.x < 6.0.5 SSL VPN Buffer Overflow (FG-IR-18-387)

Medium Nessus Plugin ID 125886

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VPR Score: 3.6

Synopsis

The remote host is affected by a buffer overflow condition.

Description

The remote host is running a version of FortiOS prior or equal to 5.4, 5.6.x prior to 5.6.8 or 6.0.x prior to 6.0.5. It is, therefore, affected by a buffer overflow condition in the SSL-VPN web portal, due to a failure to properly parse message payloads. An unauthenticated attacker can exploit this, via a specially crafted request to cause a denial of service condition.

Solution

Upgrade to Fortinet FortiOS version to 5.6.8, 6.0.5, 6.2.0 or later. Alternatively, apply one of the workarounds outlined in the linked advisory

See Also

http://www.nessus.org/u?ffaddea9

Plugin Details

Severity: Medium

ID: 125886

File Name: fortios_FG-IR-18-387.nasl

Version: 1.6

Type: local

Family: Firewalls

Published: 2019/06/14

Updated: 2019/11/21

Dependencies: 73522

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

VPR Score: 3.6

CVSS Score Source: CVE-2018-13381

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:fortinet:fortios

Required KB Items: Host/Fortigate/version, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 2019/05/17

Vulnerability Publication Date: 2019/05/17

Reference Information

CVE: CVE-2018-13381

BID: 108440