SB2020042406 - Multiple vulnerabilities in NGINX Controller

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper Certificate Validation (CVE-ID: CVE-2020-5864)

CWE-ID: CWE-295 - Improper Certificate Validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform a man-in-the-middle (MitM) attack.

The vulnerability exists due to communication between NGINX Controller and NGINX Plus instances skip TLS verification by default. A remote attacker can perform a MitM attack and read/modify data in transit.

2) Improper Authorization (CVE-ID: CVE-2020-5863)

CWE-ID: CWE-285 - Improper Authorization

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

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

The vulnerability exists due to NGINX Controller allows a remote unauthenticated attacker to create unprivileged user accounts and upload a new license to the system. A remote attacker can use this behavior to consume all available disk space on the system and perform a denial of service attack.

Remediation

Install update from vendor's website.

References

• https://support.f5.com/csp/article/K27205552
• https://api-u.f5.com/support/kb-articles/K14631834?cacheFlag=false