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https://github.com/mohemiv/TCLtools

Сollection of TCL scripts for Cisco IOS penetration testing
https://github.com/mohemiv/TCLtools

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Сollection of TCL scripts for Cisco IOS penetration testing

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README 

        
TCL scripts for Cisco IOS penetration testing

=======

With TCLtools you can transform any Cisco IOS hardware into a pivoting station. It's easy to set up and use!



Features

---------------------------



 * TCLmap — Port scanner implementation (nmap)

 * TCLproxy — Proxy server implementation



TCLproxy

--------

TCLproxy is a tool for pivoting through Cisco devices. It's capable to forward any TCP port or launch a proxy server.



```

TCLproxy v0.0.3



Usage: tclsh ./tclproxy.tcl [-L address]... [-D address]...



Proxy server implementation. Binary protocols are supported.



  -L [bind_address:]port:remote_host:remote_port

    Forward a remote port to a local port.

    Multiple connections and multiple forwards are supported.



  -D [bind_address:]port

    Launch a SOCKS4a proxy server.



 Forwarding between VRF tables:

    -D [VRF_table_for_listening@][bind_address]:port[@VRF_table_for_outbound_connections]

    -L [VRF_table_for_listening@][bind_address]:port[@VRF_table_for_outbound_connections]:remote_host:remote_port



  optional arguments:

  -f, --disable-eof-check      Speed increases by 1-15 KB/s, but connections don't close automatically. Dangerous!

  -h, --help                   Show this help message and exit.

  -q, --disable-output         Quite mode. In this mode, you can disconnect from the console without script termination. Dangerous!

  -l, --low-ports              Use privileged source ports. Required for NFS (source port increments from 1 to 1023 every connection)

  -n, --disable-dns            Do not resolve DNS names in SOCKS mode



  The effect of --disable-eof-check and --disable-output options depends on hardware architecture and firmware version.

  TCLproxy will not work for port scanning, use tclmap.tcl instead.



   example:

    $ sudo py3tftp -p 69

    cisco# configure terminal

    cisco(config)# scripting tcl low-memory 5242880

    cisco(config)# end

    cisco# copy tftp://192.168.1.10/tclproxy.tcl flash:/

    cisco# tclsh tclproxy.tcl -h

    cisco# tclsh tclproxy.tcl -L 5901:10.0.0.1:445 -D :5902@enterpriseVRF -D 5900

    ...

    cisco# del flash:/tclproxy.tcl



```



About TCL

=========

TCL is a high-level, general-purpose, interpreted, dynamic programming language. Cisco IOS implements TCL 8.3.4:



```

cisco# tclsh

cisco(tcl)# puts $tcl_version

8.3



cisco(tcl)# puts $tcl_patchLevel

8.3.4

```



How to use TCLtools

===========================

TCLtools requires privilege level 15 on the hardware.



There are four methods to upload TCL scripts:



1. Copy tcl script from ftp or tftp server:



```

$ sudo py3tftp -p 69

or

$ python2 -m pyftpdlib 



cisco# copy tftp://192.168.1.10/tclproxy.tcl flash:/

cisco# copy ftp://192.168.1.10:2121/tclproxy.tcl flash:/

cisco# tclsh tclproxy.tcl



or



cisco# tclsh ftp://192.168.1.10:2121/tclproxy.tcl

```



2. Create new file via tclsh:



```

$ cat tclproxy.tcl | sed -E 's/([{}$\[])/\\\1/g'

cisco# tclsh

cisco(tcl)# puts [open "flash:tclproxy.tcl" w+] {

cisco(tcl)# ; Copy file contents onto this

cisco(tcl)# }

cisco(tcl)# exit

cisco#

cisco# tclsh tclproxy.tcl

```



3. Set $argv var and put script code into tclsh (non-recommended):



```

cisco# tclsh

cisco(tcl)# set argv [list -D 1080]

cisco(tcl)# ; Copy file contents onto this

```



4. Use "scripting tcl init" command (non-recommended):



```

cisco# configure terminal

cisco(config)# scripting tcl init ftp://192.168.1.10/tclproxy.tcl

cisco(config)# end

cisco# tclsh

```



A good practice is to set the minimum size of free memory:



```

cisco# configure terminal

cisco(config)# scripting tcl low-memory 5242880

cisco(config)# end

```



In addition to, or instead of, you can view device performance with the following commands:



```

cisco# show processes cpu | i Tcl

cisco# show processes mem | i Tcl

```



Remarks

=======================



 * Do not use TCLproxy for TCP/IP port scanning. Because Cisco doesn't implement -async socket option, socks server is interrupted for 30 seconds after every connection to any filtered port.

 * Outdated IOS versions can redirect TCL output to another console. It's an IOS bug.

 * If you disconnect from the console, TCL script stops after the next output.



Tested on Cisco 2811 / Cisco 2821 Integrated Services Router, Cisco Catalyst 2960, and Cisco Catalyst 3750-X.



Contact Us

==========



You can Open a New Issue to report a bug or suggest a new feature to improve the project. Or you can drop a few lines at [email protected].