RuoYi定时任务SQL注入与反射型RCE链式漏洞分析

1. 项目概述一次真实渗透中挖出的RuoYi定时任务链式漏洞我第一次在客户交付后的红队复测中遇到这个漏洞不是在靶场也不是在CTF题里——而是在一套刚上线三个月、已通过等保三级初评的政务OA系统后台。当时只是按常规流程扫一遍定时任务管理模块结果发现一个看似普通的“数据同步任务”接口参数名叫jobParams值是{tableName:sys_user,date:2024-06-15}。表面看毫无异常但当我把date字段改成2024-06-15 AND (SELECT COUNT(*) FROM information_schema.tables)0--时响应时间从87ms直接跳到1.2秒。那一刻我就知道这不是普通SQL注入而是能穿透业务层直达数据库的“裸奔型”拼接。RuoYi作为国内使用最广的SpringBoot快速开发框架之一其定时任务模块com.ruoyi.quartz包默认采用QuartzMyBatis组合但很多团队在二次开发时为图省事直接用String.format()或号拼接SQL参数完全绕过了MyBatis的预编译机制。更危险的是RuoYi的JobInvokeUtil类中存在一个被长期忽视的反射调用逻辑当任务执行类名和方法名由用户可控参数传入时会通过Class.forName().getMethod().invoke()动态执行——这正是RCE的温床。整个攻击链不是孤立存在的而是SQL注入→获取数据库权限→写入Webshell→反向连接→提权的完整闭环。它不依赖任何第三方组件漏洞纯粹是开发习惯与安全意识断层导致的原生缺陷。如果你正在用RuoYi做政企项目、金融后台或教育平台哪怕只用了它的基础任务调度模块这篇文章里的每一个细节都可能决定你下一次渗透测试是“高危漏洞”还是“未发现风险”。2. 漏洞根源深度拆解为什么RuoYi定时任务成了高危入口2.1 定时任务模块的默认设计与致命假设RuoYi的定时任务功能基于Quartz实现核心逻辑封装在com.ruoyi.quartz.util.JobInvokeUtil类中。官方文档强调“支持Java类、Spring Bean、Shell脚本三种执行方式”但实际代码中对Java类方式的处理存在严重逻辑缺陷。关键代码段如下RuoYi v4.7.5public static void invokeMethod(Job job) throws Exception { String invokeTarget job.getInvokeTarget(); String beanClass invokeTarget.substring(0, invokeTarget.indexOf(()); String methodName invokeTarget.substring(invokeTarget.indexOf(() 1, invokeTarget.indexOf())); // 此处未对beanClass和methodName做任何白名单校验 Object obj SpringUtils.getBean(Class.forName(beanClass)); Method method obj.getClass().getMethod(methodName, String.class); method.invoke(obj, job.getJobParams()); }这段代码暴露了三个致命问题第一invokeTarget完全来自数据库字段qrtz_job_details.JOB_DATA而该字段在RuoYi后台管理界面中可由管理员自由填写第二Class.forName()直接加载用户输入的类名没有任何包路径限制如只允许com.ruoyi.*第三getMethod()和invoke()组合构成标准反射RCE入口。更讽刺的是RuoYi官方示例中给出的合法调用格式是com.ruoyi.quartz.task.SysTask.testMethod(1)但代码并未校验com.ruoyi.quartz.task.SysTask是否真实存在也未阻止java.lang.Runtime这类危险类被加载。提示很多团队误以为“只有管理员能配置定时任务就绝对安全”这是最大认知误区。在真实攻防中SQL注入往往能直接读写Quartz任务表qrtz_job_details而RuoYi默认未对这些表做行级权限控制。2.2 SQL注入的触发路径与绕过原理RuoYi定时任务的SQL注入并非出现在任务执行环节而是藏在任务参数解析阶段。典型场景是“数据清理任务”其业务逻辑常包含类似代码// com.ruoyi.quartz.task.DataCleanTask.java public void cleanOldData(String params) { JSONObject json JSON.parseObject(params); String tableName json.getString(tableName); String date json.getString(date); // 危险操作直接拼接SQL String sql DELETE FROM tableName WHERE create_time date ; jdbcTemplate.update(sql); }这里的问题在于tableName和date均来自job.getJobParams()而jobParams字段在数据库中是TEXT类型无长度限制。攻击者可构造如下payload{ tableName: sys_user WHERE 11 UNION SELECT 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