#VU53577 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in NGINX Controller - CVE-2021-23020
Published: May 25, 2021
Vulnerability identifier: #VU53577
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-23020
CWE-ID: CWE-338
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
NGINX Controller
NGINX Controller
Software vendor:
F5 Networks
F5 Networks
Description
The vulnerability allows a local user to bypass implemented security restrictions.
the vulnerability exists due to the NAAS API keys are generated using an insecure pseudo-random string and hashing algorithm. A local user can potentially generate a valid user key.
Remediation
Install updates from vendor's website.