#VU60934 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in FortiPortal - CVE-2021-36171

Vulnerability identifier: #VU60934

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-36171

CWE-ID: CWE-338

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FortiPortal
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote attacker to gain unauthorized access to the system.

the vulnerability exists due to weak pseudo-random number generator in the password reset feature. A remote attacker can predict parts of or the whole newly generated password within a given time frame and gain access to the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiPortal: 5.2.0 - 6.0.5

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External links
https://fortiguard.com/psirt/FG-IR-21-099

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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.