web 扫描漏洞:HTML form without CSRF protection 问题解决

文章探讨了利用acunetix扫描工具发现的一种安全漏洞,涉及利用诱导链接窃取用户session或cookie信息。提出通过在表单提交中添加token和随机数参数,并在后台验证一致性来防止CSRF攻击。给出了使用JavaJSP的示例代码。

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一.扫描工具:acunetix

二.问题描述

该漏洞主要是利用用户登录网站中的session 或 cookie 信息,采用诱导链接,获取用户浏览器中的相关session 或 cookie ,发送恶意请求或重复攻击;

三.解决方法

1.在提交浏览器表单信息时,增加 token 或 随机数 参数,并将 参数 写入到 session 信息;后台校验时,通过 对比 表单参数和 session 中的参数的一致性,判断表单提交是否是来源于页面的正常请求。

jsp 页面代码如下:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 <% //增加随机数,解决 CSRF 漏洞
		String uuid = UUID.randomUUID().toString().replaceAll("-", "");
		request.getSession().setAttribute("randTxt",uuid);
		//设置cookie只读
		String sessionid = request.getSession().getId();
		response.setHeader("SET-COOKIE", "JSESSIONID=" + sessionid + "; secure ; HttpOnly");  %>

表单提交时,增加随机数参数:

<input type="hidden" name="randSesion"  value = "<%=request.getSession().getAttribute("randTxt")%>" />
### XSSO Web Server Configuration and Security Issues #### Understanding XSSO Web Servers XSSO (Cross-Site Scripting Origin) web servers are designed to handle specific types of cross-site scripting vulnerabilities while ensuring secure communication between the client and server. The configuration and security measures implemented on these servers play a crucial role in mitigating potential threats[^1]. #### Key Configuration Settings For optimal performance and security, several key settings should be configured properly: - **HTTP Headers**: Implement strict transport security by setting appropriate HTTP headers such as `Content-Security-Policy`, `Strict-Transport-Security`, and `X-XSS-Protection`[^2]. - **Input Validation**: Ensure all user inputs undergo rigorous validation before processing or storing them within the application logic. This prevents malicious scripts from being injected into the system. - **Output Encoding**: Apply output encoding techniques when rendering data back to users. By converting special characters like `<`, `>`, etc., this reduces risk associated with injecting harmful code snippets directly into HTML content sent out by the server[^3]. ```python def sanitize_input(user_data): # Example function that sanitizes input using an external library import html cleaned = html.escape(user_data) return cleaned ``` #### Addressing Common Vulnerabilities To address common vulnerabilities found in XSS attacks against web applications hosted on XSSO servers: - **CSRF Protection**: Incorporate anti-CSRF tokens during form submissions which can help prevent unauthorized commands executed via forged requests made under authenticated sessions. - **Session Management**: Secure session management practices include regenerating session IDs after login events occur along with implementing short timeouts for inactive periods where no activity has been detected over time intervals specified according to business requirements[^4]. #### Best Practices for Enhancing Security Adopt best practice guidelines recommended by industry experts including but not limited to: - Regularly updating software components used across platforms hosting services provided through your infrastructure; - Conducting thorough penetration testing exercises periodically aimed at identifying weak points susceptible exploitation attempts targeting known attack vectors related specifically towards Cross Site Scripting exploits; - Educating developers about safe coding standards emphasizing importance around proper handling sensitive information throughout entire lifecycle development process starting design phase until deployment stage is reached successfully without compromising integrity systems involved overall operation environment setup correctly following established protocols outlined beforehand clearly documented internally accessible everyone concerned parties responsible maintaining quality assurance levels expected today's competitive landscape continuously evolving cybersecurity challenges faced daily basis globally speaking[^5].
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