Shocker - A tool to find and exploit servers vulnerable to Shellshock

Tuesday, March 22, 2016


A tool to find and exploit servers vulnerable to Shellshock

Help Text
usage: shocker.py
-h, --help show this help message and exit
--Host HOST, -H HOST A target hostname or IP address
--file FILE, -f FILE File containing a list of targets
--port PORT, -p PORT The target port number (default=80)
--exploit EXPLOIT, -e EXPLOIT Command to execute (default=/bin/uname -a)
--cgi CGI, -c CGI Single CGI to check (e.g. /cgi-bin/test.cgi)
--proxy PROXY A BIT BROKEN RIGHT NOW Proxy to be used in the form 'ip:port'
--ssl, -s Use SSL (default=False)
--threads THREADS, -t THREADS Maximum number of threads (default=10, max=100)
--verbose, -v Be verbose in output

Usage Examples
./shocker.py -H 127.0.0.1 -e "/bin/cat /etc/passwd" -c /cgi-bin/test.cgi
Scans for http://127.0.0.1/cgi-bin/test.cgi and, if found, attempts to cat /etc/passwd
./shocker.py -H www.example.com -p 8001 -s
Scan www.example.com on port 8001 using SSL for all scripts in cgi_list and attempts the default exploit for any found
./shocker.py -f ./hostlist
Scans all hosts listed in the file ./hostlist with the default options

Dependencies
Python 2.7+

Change Log
Changes in version 0.72 (December 2014)
  • Minor corrections to logic and typos
Changes in version 0.71 (December 2014)
  • Added timeout to urllib2.urlopen requests using a global 'TIMEOUT'
Changes in version 0.7 (November 2014)
  • Add interactive 'psuedo console' for further exploitation of a chosen vulnerable server
  • Attemped to clean up output buffering issues by wrapping sys.stdout in a class which flushes on every call to write
  • Added a progress indicator for use in time consuming tasks to reassure non vebose users
Changes in version 0.6 (October 2014)
  • Preventing return codes other than 200 from being considered successes
  • Added ability to specify multiple targets in a file
  • Moved the 'cgi_list' list of scripts to attempt to exploit to a file
  • Fixed some output formatting issues
  • Fixed valid hostname/IP regex to allow single word hostnames
Changes in version 0.5 (October 2014)
  • Added ability to specify a single script to target rather than using cgi_list
  • Introduced a timeout on socket operations for host_check
  • Added some usage examples in the script header
  • Added an epilogue to the help text indicating presence of examples
Changes in version 0.4 (October 2014)
  • Introduced a thread count limit defaulting to 10
  • Removed colour support until I can figure out how to make it work in Windows and *nix equally well
  • Spelling corrections
  • More comprehensive cgi_list
  • Removes success_flag from output
Pre 0.4 (October 2014)
  • No idea

TODO
  • Identify and respond correctly to HTTP/200 response - false positives - Low priority/hassle
  • Implement curses for *nix systems - For the whole application or only psuedo terminal? - Low priority/prettiness
  • Thread the initial host check now that multiple targets are supported (and could be make this bit time consuming)
  • Change verbose to integer value - quiet, normal, verbose, debug?
  • Add option to skip initial host checks for the sake of speed?
  • Add a summary of results before exiting
  • Save results to a file? Format?
  • Eventually the idea is to include multiple possible vectors but currently only one is checked.
  • Add Windows and *nix colour support - Low priority/prettiness
  • Add a timeout in interactive mode for commands which don't return, e.g. /bin/cat /dev/zero
  • Prettify - Low priority/pretinness (obviously)
  • Add support for scanning and explointing SSH and SMTP? https://isc.sans.edu/diary/Shellshock+via+SMTP/18879
  • Add SOCKS proxy support, potentially using https://github.com/rpicard/socksonsocks/ from Rober Picard
  • Other stuff. Probably.




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