Denial of service in Fortinet FortiOS

1) Input validation error

EUVDB-ID: #VU23072

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-15705

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in the SSL VPN portal. A remote attacker can send a specially crafted POST request and crash the SSL VPN service.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiOS: 2.36 - 6.2.1

CPE2.3

• cpe:2.3:o:fortinet:fortios:6.2.1:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.6:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:5.6.11:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:5.4.12:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:5.2.15:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:5.0.14:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:4.3.16:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:4.2.13:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:4.1.11:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:3.0:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:3 beta:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:2.80:*:*:*:*:*:*:*

External links

http://fortiguard.com/advisory/FG-IR-19-236

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.