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AmnPardaz Security Research Team

Title: ACollab Multiple Vulnerabilities

Vendor: http://www.atutor.ca/acollab

Vulnerable Version: 1.2 (Latest version till now)

Exploitation: Remote with browser

Fix: N/A

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• Description:
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ACollab as described by its vendor is an accessible, open source,
multi-group, Web-based collaborative
work environment. ACollab is available as a standalone collaborative
work environment that will run on
its own. ACollab is ideal for groups working at a distance developing
documentation, collaborating on
research, or writing joint papers.

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• Vulnerability:
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±-> SQL Injection
All of the parameters are sanitized correctly before being used in
SQL queries else of
the POST parameters 'login' and 'password' in the "sign_in.php" page.
These parameters
can be used for injecting arbitrary SQL queries; the 'login'
parameter is single quoted
and the 'password' parameter is single parenthesized, single quoted.

±-> Authentication Bypass
The ACollab CMS uses two mechanism for authentication. One for master
admin user which is
based on a hard coded username/password initialized in the
installation process. And a DB-based
authentication for all other users, including the group
administrators which can add/remove/edit
all posts and news and … from forums and first screen of the
website. The second authentication
mechanism can be bypassed.

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• Exploits/PoCs:
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±-> Exploiting The (MySQL) SQL Injection Vulnerability:
Go to the sign in page at "victim.net/ACollab/sign_in.php" and use
the following vectors for injecting
your desired SQL query, namely $Q:
- In the Username field (login POST parameter): ' or $Q or ''='
- In the Password field (password POST parameter): ') or $Q or (''='

±-> Exploiting The Authentication Bypass Vulnerability:
You can login as anyone of the registered users of ACollab CMS by
providing following vector
as username and nothing as password:
'or''='' limit 1 offset 0 – '
Above vector will log you as the first user according to its member
id order. You can login as other
users, searching for a group administrator account, by following vectors:
'or''='' limit 1 offset 0 – '
'or''='' limit 1 offset 1 – '
'or''='' limit 1 offset 2 – '
…

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• Solution:
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Add the following command
$_POST['login'] = addslashes ($_POST['login']);
$_POST['password'] = addslashes ($_POST['password']);
at the line 46 of 'sign_in.php' file.

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• Original Advisory:
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http://www.bugreport.ir/index_72.htm

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• Credit:
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  AmnPardaz Security Research & Penetration Testing Group
  Contact: admin[4t}bugreport{d0t]ir
  www.BugReport.ir
  www.AmnPardaz.com