安恒429|复赛 web write up && 决赛经验
由于已经没有复赛的环境,只能文字回忆一下了
复赛给了web 2 350 原本是想考一个SSRF利用gopher去搞定一个fastcgi的外联端口,执行命令
具体的文章
http://zone.wooyun.org/content/1060
http://drops.wooyun.org/web/9845
然而出题人没把好关 长亭3分钟秒掉这道题后基本就猜到有奇解
那么其实就是简单的file协议 file://index.php 拿到了flag
然后一开始卡住的web 1 300呢,是通过注册超长字符串的用户,重复注册爆出dumplicate entry
得到管理员的hash admin_7365598732 24461a3ef270c652949f5fc37f37fcb2
解密后得到RGoN7r}G8lnrYBAX6n
登陆管理页,有一个删除文件的功能,传递的id参数可以用报错注入payload
1 |
|
得到flag,然后居然还是一血。大概因为注起来很麻烦吧。
凭借着自己拿下的650+d神的500以及外校队友拿下的密码学题目 7th进入决赛。
===========================================================================
帅不过三秒 下午决赛开始被血虐
送走大寸自己稍微有点小低落,然后就被抓了先手
web我一开始没审计代码的时候,发现了至少3个点
这里用黑名单进行过滤,导致php5等后缀可以绕过
另外就是前台文章的一个root注入点
然而修复的时候使用的正则表达式/select.*from/i
算是最大的败笔,没有加s修饰符的话,用%0a是可以绕过的。
在注入的时候into outfile一直会把前面的用户数据读进去,一开始想的方法是
用户名注册为 然后导出
得到了wildwolf的webshell。但后来由于插内存马的时候报错,导致整个数据废掉了。
后来用union select来覆盖前面的数据,重新导出了,但是于事无补,自己也只拿到了200多分。
期间pwn和web服务一直被人打挂掉,导致了巨额失分。
最后今天回来的时候重新写了一份php的自动化防护脚本,希望以后攻防赛有机会用上
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1658
14
1415
52
1309
25
1257
29
1231
24
How does session hijacking work and how can you mitigate it in PHP?
Apr 06, 2025 am 12:02 AM
Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS.
Explain different error types in PHP (Notice, Warning, Fatal Error, Parse Error).
Apr 08, 2025 am 12:03 AM
There are four main error types in PHP: 1.Notice: the slightest, will not interrupt the program, such as accessing undefined variables; 2. Warning: serious than Notice, will not terminate the program, such as containing no files; 3. FatalError: the most serious, will terminate the program, such as calling no function; 4. ParseError: syntax error, will prevent the program from being executed, such as forgetting to add the end tag.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1?
Apr 17, 2025 am 12:06 AM
In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.
What are HTTP request methods (GET, POST, PUT, DELETE, etc.) and when should each be used?
Apr 09, 2025 am 12:09 AM
HTTP request methods include GET, POST, PUT and DELETE, which are used to obtain, submit, update and delete resources respectively. 1. The GET method is used to obtain resources and is suitable for read operations. 2. The POST method is used to submit data and is often used to create new resources. 3. The PUT method is used to update resources and is suitable for complete updates. 4. The DELETE method is used to delete resources and is suitable for deletion operations.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
Explain Arrow Functions (short closures) introduced in PHP 7.4.
Apr 06, 2025 am 12:01 AM
The arrow function was introduced in PHP7.4 and is a simplified form of short closures. 1) They are defined using the => operator, omitting function and use keywords. 2) The arrow function automatically captures the current scope variable without the use keyword. 3) They are often used in callback functions and short calculations to improve code simplicity and readability.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
