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

From: d4rk (d4rk_at_securitylab.ru)
Date: 03/02/04

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    To: full-disclosure@lists.netsys.com
Date: Tue, 2 Mar 2004 12:01:08 +0300

    > /**
    > ** ! XBoard 4.2.7 UNPUBLISHED VULNERABLITY , 0hDAY !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!!

    >narkotix@labs:~/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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