Fortinet FortiOS < 5.6.11, 6.0.x < 6.0.5 SSL VPN Heap Buffer Overflow (FG-IR-18-388)

Medium Nessus Plugin ID 125887

Synopsis

The remote host is affected by a heap buffer overflow condition.

Description

The remote host is running a version of FortiOS prior to 5.6.11 or 6.0.x prior to 6.0.5. It is, therefore, affected by a heap buffer overflow condition in the SSL VPN web portal due to improper handling of javascript href data. An unauthenticated, remote attacker can exploit this, by convincing a user to visit a specifically crafted webpage, to cause a denial of service condition.

Solution

Upgrade to Fortinet FortiOS version to 5.6.11, 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?3de925e0

Plugin Details

Severity: Medium

ID: 125887

File Name: fortios_FG-IR-18-388.nasl

Version: 1.5

Type: local

Family: Firewalls

Published: 2019/06/14

Updated: 2019/11/21

Dependencies: 73522

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2018-13383

CVSS v2.0

Base Score: 4.3

Temporal Score: 3.2

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

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

CVSS v3.0

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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: 2019/04/02

Vulnerability Publication Date: 2019/04/02

Reference Information

CVE: CVE-2018-13383

BID: 108539

IAVA: 0001-A-0004