Sophos UTM 525 Full Guard Cross Site Scripting

🗓️ 01 Mar 2016 00:00:00Reported by Dr. Adrian VollmerType
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Sophos UTM 525 Full Guard XSS vulnerability in Web Application Firewal
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Advisory ID: SYSS-2016-009  
Product: Sophos UTM 525 Full Guard   
Vendor: Sophos  
Affected Version(s): 9.352-6, 94988   
Tested Version(s): 9.352-6, 94988   
Vulnerability Type: Cross-Site Scripting (CWE-79)   
Risk Level: Medium  
Solution Status: Fixed  
Vendor Notification: 2016-02-03  
Solution Date: 2016-02-17  
Public Disclosure: 2016-03-01  
CVE Reference: Not assigned  
Author of Advisory: Dr. Adrian Vollmer (SySS GmbH)  
  
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Overview:  
  
The Sophos UTM 525 is a hardware appliance which aims to provide several  
protection mechanisms for users and servers in an enterprise environment.  
One if its functions is a Web Application Firewall (WAF).  
  
The software manufacturer describes the application as follows (see [1]):  
  
Sophos UTM 525 is designed to provide protection for larger enterprises.  
Based on high quality Intel-compatible server systems, including Intel  
Multi-Core processor technology and redundant hard disks and power   
supplies, it provides optimal performance and reliability even for   
larger environments.  
  
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Vulnerability Details:  
  
The SySS GmbH identified a text-book Cross-Site Scripting vulnerability.  
  
Inserting an HTML 'script' tag into the URL of a web site protected by  
Sophos UTM 525 yields an error page which contains the 'script' tag  
unfiltered. Executing malicious JavaScript code in the victim's browser   
is therefore straightforward.  
  
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Proof of Concept (PoC):  
  
The following Unix command demonstrates the vulnerability.  
  
$ curl 'https://[HOST]/%3Cscript%3Ealert("SySS%20XSS")%3C/script%3E'  
  
<html><head><title>Request blocked</title><meta name="robots"  
content="noindex"></head><body><h1>Request blocked</h1><p>The web  
application firewall has blocked access to <i>/<script>alert("SySS  
XSS")</script></i> for the following reason:</p><pre><b>No signature  
found</b></pre><hr></body></html>  
  
The unfiltered 'script' tag is visible in the HTML source of the response  
and the contained JavaScript code will be executed in the victim's   
browser.  
  
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Solution:  
  
Update the firmware to version 9.354 or later [4].  
  
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Disclosure Timeline:  
  
2015-11-24: Vulnerability discovered  
2016-02-03: Vulnerability reported to vendor  
2016-02-17: Release of version 9.354  
2016-03-01: Public release of security advisory  
  
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References:  
  
[1] www.sophos.com/en-us/medialibrary/PDFs/factsheets/sophosutm525dsna.pdf?la=en-us  
[2] SySS GmbH, SYSS-2016-009   
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/2016/SYSS-2016-009.txt  
[3] SySS GmbH, SySS Responsible Disclosure Policy  
https://www.syss.de/en/news/responsible-disclosure-policy/  
[4] https://blogs.sophos.com/2016/02/17/utm-up2date-9-354-released/  
  
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Credits:  
  
Security vulnerability found by Dr. Adrian Vollmer of SySS GmbH.  
  
E-Mail: [email protected]  
Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Adrian_Vollmer.asc  
Key ID: 0x037C9FE7  
Key Fingerprint: 70CF E88C AEE7 DB0F 5DC8 3403 0E02 7C7E 037C 9FE7  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
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. The  
latest version of this security advisory is available on the SySS Web  
site.  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Copyright:  
  
Creative Commons - Attribution (by) - Version 3.0  
URL: http://creativecommons.org/licenses/by/3.0/deed.en  
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01 Mar 2016 00:00Current
7.4High risk
Vulners AI Score7.4