Http Header注入

原理:
http header注入,该注入是指利用后端验证客户端口信息(比如常用的cookie验证)或者通过http header中获取客户端的一些信息(比如useragent用户代理等其他http header字段信息),因为这些信息是会重新返回拼接到后台中的,所以再对这些信息进行sql处理,又因为后台没有进过相对应的信息处理所以构成了sql注入。


这里科普一下:cookie是储存在用户本地终端上的数据,Cookie,有时也用其复数形式 Cookies,指某些网站为了辨别用户身份、进行 session 跟踪而储存在用户本地终端上的数据(通常经过加密)。


具体方法:
第一步:用bp工具对网站登录页面进行抓包,然后对user agent数据(这里不一定是user agent,你怀疑哪一个你就改哪一个)进行测试,看是否存在sql注入,也就是输入单引号或者其他违规语法,看后台返回的信息中是否存在syntax error(语法错误)。
第二步:确认存在sql注入以后,就可以渗透了,updatexml()函数,extractvalue()函数,floor()函数,都可以。
x’ or updatexml(1,concat(0x7e,database()),1) or ’
x’ or extractvalue(1,concat(0x7e,database())) or ’
效果图:
在这里插入图片描述


除了上面的对user angent进行修改,还有对cookie进行修改
在这里插入图片描述
高光部分经过测试都存在sql注入,和上面user angent一样的处理就可以
在这里插入图片描述
得到结果:
在这里插入图片描述

### Pikachu Framework HTTP Header Injection Solution and Information #### Understanding the Vulnerability In web applications, developers often retrieve client information through HTTP headers such as `User-Agent`, `Accept`, or custom-defined fields. When backend code processes these headers without proper sanitization, it can lead to SQL injection vulnerabilities[^2]. In the context of the Pikachu training platform, this issue is demonstrated within specific modules designed for learning purposes. #### Demonstrating the Exploit Process To explore how an attacker might exploit a vulnerable application on Pikachu: - Navigate to the **Http Header Injection** module. - Retrieve login credentials by clicking the provided hint button. - After logging in with obtained credentials, intercept the GET request using Burp Suite. - Modify intercepted requests targeting parameters derived from HTTP headers that are processed unsafely by the server-side logic[^1]. #### Implementing Mitigation Strategies Preventing HTTP header-based SQL injections involves several best practices: - Validate all inputs rigorously before processing them further. - Employ prepared statements (parameterized queries) when interacting with databases. - Sanitize user-supplied data effectively to remove any potentially harmful characters or patterns. For example, instead of directly embedding variables into query strings, use parameter binding methods supported by most modern database APIs: ```sql SELECT * FROM users WHERE username = ? AND password = ? ``` This approach ensures that even maliciously crafted input cannot alter the structure of your intended command. #### Enhancing Security Measures Beyond coding standards, additional layers should be added to fortify defenses against attacks like those exploiting weak handling of HTTP headers: - Regular security audits and penetration testing sessions help identify potential weaknesses early. - Educate development teams about secure programming principles regularly. - Keep software up-to-date with patches addressing known issues promptly. --related questions-- 1. What other types of injection flaws exist beyond SQL? 2. How does one configure Burp Suite optimally for intercepting traffic during vulnerability assessments? 3. Can you provide examples of real-world incidents caused by improper management of HTTP headers leading to severe consequences? 4. Are there automated tools available specifically tailored towards detecting SQL injection points related to HTTP headers?
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