Brute-force attack in F5 Networks products - CVE-2018-5506

Vulnerability identifier: #VU12849

CSH Severity: Low

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2018-5506

CWE-ID: CWE-307

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
BIG-IP LTM
BIG-IP AFM
BIG-IP Analytics
BIG-IP APM
BIG-IP ASM
BIG-IP GTM
BIG-IP PEM
BIG-IP AAM
BIG-IP DNS
BIG-IP Edge Gateway
BIG-IP Link Controller
BIG-IP WebAccelerator
BIG-IP WebSafe

Software vendor:
F5 Networks

The vulnerability allows a remote unauthenticated attacker to bypass security restrctions on the target system.

The weakness exists in the Apache modules apache_auth_token_mod and mod_auth_f5_auth_token.cpp due to handling of invalid IP addresses. A remote attacker can bruteforce on the em_server_ip authorization parameter to obtain which SSL client certificates used for mutual authentication between BIG-IQ or Enterprise Manager (EM) and managed BIG-IP devices.

Update to versions 11.5.6, 11.6.2, 12.1.3.2, 13.0.0 HF1, 13.0.1 or 13.1.0.

• https://support.f5.com/csp/article/K65355492