Denial of service in FortiProxy dhcpd deamon



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-42755
CWE-ID CWE-190
Exploitation vector Local network
Public exploit N/A
Vulnerable software
Subscribe 		FortiProxy
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor Fortinet, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Integer overflow

EUVDB-ID: #VU64930

Risk: Medium

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

CVE-ID: CVE-2021-42755

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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

The vulnerability exists due to integer overflow within the dhcpd deamon. A remote non-authenticated attacker on the local network can send specially crafted traffic to the affected system, trigger an integer overflow and perform a denial of service (DoS) attack.


Mitigation

Install update from vendor's website.

Vulnerable software versions

FortiProxy: 1.0.0 - 7.0.0

CPE2.3 External links

http://fortiguard.fortinet.com/psirt/FG-IR-21-155


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

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.



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