Weak cryptography in NGINX Controller NAAS API



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-23020
CWE-ID CWE-338
Exploitation vector Local
Public exploit N/A
Vulnerable software
 NGINX Controller
Server applications / Web servers

Vendor F5 Networks

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

EUVDB-ID: #VU53577

Risk: Low

CVSSv4.0: 1.1 [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 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Exploit availability: No

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NGINX Controller: 3.0.0 - 3.9.0

CPE2.3 External links

https://support.f5.com/csp/article/K45263486


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

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

The attacker would have to login to the system and perform certain actions 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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