Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in NGINX Controller - CVE-2021-23020
Published: May 25, 2021
Vulnerability identifier: #VU53577
CSH Severity: Low
CVSS v4: 4.8 [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]
CVE-ID: CVE-2021-23020
CWE-ID: CWE-338
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
NGINX Controller
IBM Cloud Pak for Business Automation
IBM Cloud Pak for Business Automation
How to mitigate CVE-2021-23020
Install updates from vendor's website.
NGINX Controller - update to 3.10.0
IBM Cloud Pak for Business Automation - update to 22.0.1.1
IBM Cloud Pak for Business Automation - update to 22.0.1.1