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Re: [Full-Disclosure] Smashing "XBoard 4.2.7(All versions)" For Fun & Profit.*Unpublish ed Local Stack Overflow Vulnerablity!

From: d4rk (d4rksecuritylab.ru)
Date: Tue Mar 02 2004 - 03:01:08 CST

> /**
> ** ! XBoard 4.2.7 UNPUBLISHED VULNERABLITY , 0hDAY !
> *
Oh yeah, xplo for non-suid prog is real oday.

I can show u one universal exploit code for ALL linux/x86 boxes! And u will
not need to exploit bofs in non-suid binaries in future!
This is real 0day! Do-not-distribute!#&(*)$#

Are u ready??!
Here it is:

====zer0-day====
int main() {
        setreuid(0,0);
        execl("/bin/sh","sh",0);
}
=====end======

Let's check!

# gcc -o zer0-day linux-own.c
# su nobody
sh: /root/.bashrc: Permission denied
sh-2.05b$ id
uid=65534(nobody) gid=65534(nogroup) groups=65534(nogroup)
/* here we are waiting when somebody with root-access will make it suid. */
/* or if root is your friend, u can ask him to do it. */
/* or if root == you, just su (chown root.root if needed) and chmod +s */
/* or somehow it will be suid by default? but i dont think so.. */
/* anyway... */
sh-2.05b$ ./zer0-day
sh-2.05b# id
uid=0(root) gid=65534(nogroup) groups=65534(nogroup)
sh-2.05b#

Yea! We did it!!

>narkotixlabs:~/c-hell$ /usr/X11R6/bin/xboard -ics -icshost `perl -e 'print
>"\x7e\xfd\xff\xbf"x166'`
>sh-2.05b# id
>uid=0(root) gid=100(users) groups=100(users) <-----on my box all of
>the programs r SUID :P just demonstrated.

As u c, on my box too =)

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