#VU12849 Brute-force attack in F5 Networks products - CVE-2018-5506

Vulnerability identifier: #VU12849

Vulnerability risk: Low

CVSSv4.0: 2.7 [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: Network

Exploit availability: No

Vulnerable software:
BIG-IP LTM
Hardware solutions / Security hardware applicances
BIG-IP AFM
Hardware solutions / Security hardware applicances
BIG-IP Analytics
Hardware solutions / Security hardware applicances
BIG-IP APM
Hardware solutions / Security hardware applicances
BIG-IP ASM
Hardware solutions / Security hardware applicances
BIG-IP GTM
Hardware solutions / Security hardware applicances
BIG-IP PEM
Hardware solutions / Security hardware applicances
BIG-IP AAM
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP DNS
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP Edge Gateway
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP Link Controller
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP WebAccelerator
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP WebSafe
Server applications / Server solutions for antivurus protection

Vendor: F5 Networks

Description
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.

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

Vulnerable software versions

BIG-IP LTM: 11.2.1 - 13.0.0

BIG-IP AAM: 11.2.1 - 13.0.0

BIG-IP AFM: 11.2.1 - 13.0.0

BIG-IP Analytics: 11.2.1 - 13.0.0

BIG-IP APM: 11.2.1 - 13.0.0

BIG-IP ASM: 11.2.1 - 13.0.0

BIG-IP DNS: 11.2.1 - 13.0.0

BIG-IP Edge Gateway: 11.2.1 - 13.0.0

BIG-IP GTM: 11.2.1 - 13.0.0

BIG-IP Link Controller: 11.2.1 - 13.0.0

BIG-IP PEM: 11.2.1 - 13.0.0

BIG-IP WebAccelerator: 11.2.1 - 13.0.0

BIG-IP WebSafe: 11.2.1 - 13.0.0

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External links
https://support.f5.com/csp/article/K65355492

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.