springMVC Unix 文件参数变更漏洞修复

错误信息如下：

 解决方案：

原因：未对用户输入正确执行危险字符清理
未检查用户输入中是否包含“…”（两个点）字符串，比如 url 为 /login?action=…/webapps/RTJEKSWTN26635&type=randomCode
cookie为Cookie: JSESSIONID=…/webapps/RTJEKSWTN26241;
测试返回为200

解决办法：通过建立过滤器方法，增加对所有用户输入信息中是否包含“..”（两个点）字符串进行清理过滤。

使用AppScan扫描之后可以通过这样的方式进行指定问题手动测试

使用过滤器过滤参数以及cookie中的…/

web.xml 配置拦截器

    <filter><filter-name>InjectFilter</filter-name><filter-class>com.fh.filter.InjectFilter</filter-class></filter>

 创建拦截器

package com.fh.filter;import com.alibaba.fastjson.JSON;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;public class InjectFilter implements Filter {private static Logger log = LoggerFactory.getLogger(InjectFilter.class);private static final String REG_EXP = "\\.\\./";@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}public void doFilter(ServletRequest request, ServletResponse response,FilterChain filterchain) throws IOException, ServletException {//判断是否有注入攻击字符HttpServletRequest req = (HttpServletRequest) request;boolean flag = injectInput(req, response);if (!flag) {return;} else {filterchain.doFilter(request, response);}}@Overridepublic void destroy() {}/*** 判断request中是否含有注入攻击字符** @param request* @return*/public boolean injectInput(ServletRequest request, ServletResponse response) throws IOException {Enumeration e = request.getParameterNames();String attributeName;String attributeValues[];HttpServletRequest req = (HttpServletRequest) request;String cookie = req.getHeader("Cookie");if (!isSpecialChar(cookie, response)){return false;}while (e.hasMoreElements()) {attributeName = (String) e.nextElement();//不对密码信息进行过滤，一般密码中可以包含特殊字符if (attributeName.equals("username") || attributeName.equals("password")) {continue;}attributeValues = request.getParameterValues(attributeName);for (int i = 0; i < attributeValues.length; i++) {if (attributeValues[i] == null || attributeValues[i].equals(""))continue;boolean flag = isSpecialChar(attributeValues[i], response);if (!flag){return flag;}}}return true;}/*** 判断字符串中是否含有注入攻击字符*/private boolean isSpecialChar(String value, ServletResponse servletResponse) throws IOException {Pattern pattern = Pattern.compile(REG_EXP);if (value == null) {return true;}Matcher matcher = pattern.matcher(value);if (matcher.find()) {log.info("入参中有非法字符: " + value);HttpServletResponse response = (HttpServletResponse) servletResponse;Map<String, Object> responseMap = new HashMap<>();// 匹配到非法字符,立即返回responseMap.put("code", 500);responseMap.put("msg", "入参中有非法字符");response.setContentType("application/json;charset=UTF-8");response.setStatus(HttpStatus.OK.value());PrintWriter writer = response.getWriter();writer.write(JSON.toJSONString(responseMap));writer.flush();writer.close();return false;}return true;}
}