Summary: The Same issue was reported on www.myynti.lahitapiolarahoitus.fi by another reporter. It was fixed for that. But when I test the same issue on lahitapiolarahoitus.fi. It is also causing leakage of information.
Description: I just identify F5 BigIP load balancers and leaks backend information (pool name, backend's IP address and port, routed domain) through cookies inserted by the BigIP system.
SET RHOST lahitapiolarahoitus.fi
[*] Starting request /
[+] F5 BigIP load balancing cookie "BIGipServerltr-prod_pool = 224700608.20480.0000" found
[+] Load balancing pool name "ltr-prod_pool" found
[+] Backend 192.168.100.13:80 found
[*] Auxiliary module execution completed
Related Report: #330716 Refer to F322966 as it is Fixed.
https://www.rapid7.com/db/modules/auxiliary/gather/f5_bigip_cookie_disclosure https://support.f5.com/csp/article/K14784%3Fsr%3D45997495 http://www.systemadvise.com/2016/11/f5-big-ip-cookie-remote-information.html
Attacker can leaks back-end information (pool name, backend's IP address and port, routed domain) through cookies inserted by the BigIP system.