Stack-based buffer overflow in FortiProxy

1) Stack-based buffer overflow

EUVDB-ID: #VU51943

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-17656

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing HTTP PUT requests in FortiProxy HTTPD daemon. A remote authenticated user can send a specially crafted HTTP PUT request, trigger stack-based buffer overflow and crash the daemon.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiProxy: 1.2.0 - 2.0.1

External links

http://www.fortiguard.com/psirt/FG-IR-21-007

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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