SkidSec WebShell

Server Address : 172.31.38.4

Web Server : Apache/2.4.58 (Ubuntu)

Uname : Linux ip-172-31-38-4 6.14.0-1017-aws #17~24.04.1-Ubuntu SMP Wed Nov 5 10:48:17 UTC 2025 x86_64

PHP Version : 7.4.33

#! /bin/sh ## Web proxy, following the grand tradition of Web things being handled by ## gross scripts. Uses netcat to listen on a high port [default 8000], ## picks apart requests and sends them on to the right place. Point this ## at the browser client machine you'll be coming from [to limit access to ## only it], and point the browser's concept of an HTTP proxy to the ## machine running this. Takes a single argument of the client that will ## be using it, and rejects connections from elsewhere. LOGS the queries ## to a configurable logfile, which can be an interesting read later on! ## If the argument is "reset", the listener and logfile are cleaned up. ## ## This works surprisingly fast and well, for a shell script, although may ## randomly fail when hammered by a browser that tries to open several ## connections at once. Drop the "maximum connections" in your browser if ## this is a problem. ## ## A more degenerate case of this, or preferably a small C program that ## does the same thing under inetd, could handle a small site's worth of ## proxy queries. Given the way browsers are evolving, proxies like this ## can play an important role in protecting your own privacy. ## ## If you grabbed this in ASCII mode, search down for "eew" and make sure ## the embedded-CR check is intact, or requests might hang. ## ## Doesn't handle POST forms. Who cares, if you're just watching HTTV? ## Dumbness here has a highly desirable side effect: it only sends the first ## GET line, since that's all you really ever need to send, and suppresses ## the other somewhat revealing trash that most browsers insist on sending. ## ## To use the proxy, export `http_proxy' in your environment, e.g. ## `http_proxy=http://localhost:8000'. # set these as you wish: proxy port... PORT=8000 # logfile spec: a real file or /dev/null if you don't care LFILE=${0}.log # optional: where to dump connect info, so you can see if anything went wrong # CFILE=${0}.conn # optional extra args to the listener "nc", for instance "-s inside-net-addr" # XNC='' # functionality switch has to be done fast, so the next listener can start # prelaunch check: if no current client and no args, bail. case "${1}${CLIENT}" in "") echo needs client hostname exit 1 ;; esac case "${1}" in "") # Make like inetd, and run the next relayer process NOW. All the redirection # is necessary so this shell has NO remaining channel open to the net. # This will hang around for 10 minutes, and exit if no new connections arrive. # Using -n for speed, avoiding any DNS/port lookups. nc -w 600 -n -l -p $PORT -e "$0" $XNC "$CLIENT" < /dev/null > /dev/null \ 2> $CFILE & ;; esac # no client yet and had an arg, this checking can be much slower now umask 077 if test "$1" ; then # if magic arg, just clean up and then hit our own port to cause server exit if test "$1" = "reset" ; then rm -f $LFILE test -f "$CFILE" && rm -f $CFILE nc -w 1 -n 127.0.0.1 $PORT < /dev/null > /dev/null 2>&1 exit 0 fi # find our ass with both hands test ! -f "$0" && echo "Oops, cannot find my own corporeal being" && exit 1 # correct launch: set up client access control, passed along thru environment. CLIENT="$1" export CLIENT test "$CFILE" || CFILE=/dev/null export CFILE touch "$CFILE" # tell us what happened during the last run, if possible if test -f "$CFILE" ; then echo "Last connection results:" cat $CFILE fi # ping client machine and get its bare IP address CLIENT=`nc -z -v -w 8 "$1" 22000 2>&1 | sed 's/.*\[$..*$\].*/\1/'` test ! "$CLIENT" && echo "Can't find address of $1" && exit 1 # if this was an initial launch, be informative about it echo "=== Launch: $CLIENT" >> $LFILE echo "Proxy running -- will accept connections on $PORT from $CLIENT" echo " Logging queries to $LFILE" test -f "$CFILE" && echo " and connection fuckups to $CFILE" # and run the first listener, showing us output just for the first hit nc -v -w 600 -n -l -p $PORT -e "$0" $XNC "$CLIENT" & exit 0 fi # Fall here to handle a page. # GET type://host.name:80/file/path HTTP/1.0 # Additional: trash # More: trash # <newline> read x1 x2 x3 x4 echo "=== query: $x1 $x2 $x3 $x4" >> $LFILE test "$x4" && echo "extra junk after request: $x4" && exit 0 # nuke questionable characters and split up the request hurl=`echo "$x2" | sed -e "s+.*//++" -e 's+[\`'\''|$;<>{}\\!*()"]++g'` # echo massaged hurl: $hurl >> $LFILE hh=`echo "$hurl" | sed -e "s+/.*++" -e "s+:.*++"` hp=`echo "$hurl" | sed -e "s+.*:++" -e "s+/.*++"` test "$hp" = "$hh" && hp=80 hf=`echo "$hurl" | sed -e "s+[^/]*++"` # echo total split: $hh : $hp : $hf >> $LFILE # suck in and log the entire request, because we're curious # Fails on multipart stuff like forms; oh well... if test "$x3" ; then while read xx ; do echo "${xx}" >> $LFILE test "${xx}" || break # eew, buried returns, gross but necessary for DOS stupidity: test "${xx}" = " " && break done fi # check for non-GET *after* we log the query... test "$x1" != "GET" && echo "sorry, this proxy only does GETs" && exit 0 # no, you can *not* phone home, you miserable piece of shit test "`echo $hh | fgrep -i netscap`" && \ echo "access to Netscam's servers <b>DENIED.</b>" && exit 0 # Do it. 30 sec net-wait time oughta be *plenty*... # Some braindead servers have forgotten how to handle the simple-query syntax. # If necessary, replace below with (echo "$x1 $hf" ; echo '') | nc... echo "$x1 $hf" | nc -w 30 "$hh" "$hp" 2> /dev/null || \ echo "oops, can't get to $hh : $hp". echo "sent \"$x1 $hf\" to $hh : $hp" >> $LFILE exit 0