Incorrect default permissions in F5 Networks products - CVE-2020-5906

Vulnerability identifier: #VU31790

CSH Severity: Medium

CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-5906

CWE-ID: CWE-276

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to incorrect default permissions for the "scp.blacklist" files. A remote user can read and overwrite blacklisted files via SCP.

BIG-IP
BIG-IP APM
BIG-IP Analytics
BIG-IP ASM
BIG-IP GTM
BIG-IP AFM
BIG-IP LTM
BIG-IP PEM
BIG-IP FPS
BIG-IP DNS
BIG-IP AAM
BIG-IP Link Controller

Install updates from vendor's website.

BIG-IP - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP APM - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP Analytics - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP ASM - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP GTM - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP DNS - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP AFM - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP AAM - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP LTM - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP Link Controller - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP PEM - addressed in versions 12.1.5.2, 13.1.3.4
BIG-IP FPS - addressed in versions 12.1.5.2, 13.1.3.4

• https://support.f5.com/csp/article/K82518062
• https://www.kb.cert.org/vuls/id/290915

• Multiple vulnerabilities in F5 BIG-IP products