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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

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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

https://www.fortiguard.com/psirt/FG-IR-18-388

Plugin Details

Severity: Medium

ID: 125887

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

Version: 1.12

Type: local

Family: Firewalls

Published: 6/14/2019

Updated: 1/30/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.1

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.6

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

CVSS Score Source: CVE-2018-13383

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 6

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:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:fortinet:fortios

Required KB Items: Host/Fortigate/version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/2/2019

Vulnerability Publication Date: 4/2/2019

CISA Known Exploited Vulnerability Due Dates: 7/10/2022

Reference Information

CVE: CVE-2018-13383

BID: 108539

IAVA: 0001-A-0004-S