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Sonicwall GMS 7.x Filter Bypass

Sonicwall GMS 7.x Filter Bypass
Posted Dec 6, 2013
Authored by Benjamin Kunz Mejri, Vulnerability Laboratory | Site vulnerability-lab.com

Dell Sonicwall GMS version 7.x suffers from filter bypass and persistent cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss
SHA-256 | ba4b237b2c6d40f4321bd55bbd8de613019ab4e747ca87417e922cf9f1d42657

Sonicwall GMS 7.x Filter Bypass

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Document Title:
Sonicwall GMS v7.x - Filter Bypass & Persistent Vulnerability

References (Source):

Bulletin: Dell SonicWALL GMS Service Bulletin for Cross-Site Scripting Vulnerability

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
Dell SonicWALL`s management and reporting solutions provide a comprehensive architecture for centrally creating and managing
security policies, providing real-time monitoring and alerts, and delivering intuitive compliance and usage reports, all from
a single management interface. Whether your organization is a small- or medium-sized business, a distributed enterprise or a
managed service provider, Dell™ SonicWALL™ offers software and appliance solutions to meet its needs.

The award-winning Dell SonicWALL Global Management System (GMS®) provides organizations, distributed enterprises and service
providers with a flexible, powerful and intuitive solution to centrally manage and rapidly deploy SonicWALL firewall, anti-spam,
backup and recovery, and secure remote access solutions. Flexibly deployed as software, hardware—in the form of the Universal
Management Appliance (UMA)—or a virtual appliance, SonicWALL GMS also provides centralized real-time monitoring and comprehensive
policy and compliance reporting to drive down the cost of owning and managing SonicWALL security appliances. Multiple GMS
software, hardware, and virtual appliance agents, when deployed in a cluster, can scale to manage thousands of SonicWALL
security appliances. This makes GMS an ideal solution for small- to medium-sized businesses, enterprises and managed service
providers that have either single-site or distributed multi-site environments.

(Copy of the Vendor Homepage: http://www.sonicwall.com/emea/en/products/Centralized_Management_Reporting.html )

Abstract Advisory Information:
The Vulnerability Laboratory Research Team discovered a persistent validation vulnerability in the DELL SonicWall GMS v7.1.x Appliance Web-Application.

Vulnerability Disclosure Timeline:
2013-09-26: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2013-09-27: Vendor Notification (DELL SonicWall Security Team)
2013-10-09: Vendor Response/Feedback (DELL SonicWall Security Team)
2013-12-04: Vendor Fix/Patch ( DELL SonicWall Developer Team)
2013-12-05: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
DELL SonicWall
Product: GMS Networks Appliance Application 7.1

Exploitation Technique:

Severity Level:

Technical Details & Description:
A persistent input validation web vulnerability has been discovered in the official DELL SonicWall GMS v7.1.x Appliance Web-Application.
The bug allows an attacker (remote) to implement/inject own malicious malicious script codes on the application-side (persistent).

The persistent vulnerability is located in the `valfield_1` & `value_1` value parameters of the `Alert Settings` module POST method request.
Remote attackers with low privileged application user account can inject own script codes to the POST method request of the createNewThreshold.jsp
appliance application file. After the inject the attacker is able to update and save the values to continue with the execute the main alert
settings module. The execute of the script code occurs in the ematStaticAlertTypes.jsp file context by the earlier manipulated vulnerable values.

To bypass the filter it is required to split the request by attaching a double frame for the script code execute. The restricted application itself
disallows the POST request of guest by usage of the unrestricted context POST method request attackers are able to bypass the filter & exception-handling.

The security risk of the persistent input validation web vulnerability is estimated as high(-) with a cvss (common vulnerability scoring system)
count of 4.1(+). The coordinated disclosure procedure of the remote vulnerability has been navigated by the product manager Wilson Lee (DELL).
The hotfix and information has been provided in cooperation with the vulnerability-laboratory.

Exploitation of the persistent web vulnerability requires low user interaction and a local low privileged (guest) web application user account.
Successful exploitation of the vulnerability can lead to persistent session hijacking (customers), account steal via persistent web attacks,
persistent phishing or persistent manipulation of vulnerable module context.

Vulnerable Application(s):
[+] DELL - SonicWall GMS v7.1.x Appliance Application

Vulnerable Module(s):
[+] Alert Settings > NewThreshold

Vulnerable File(s):
[+] createNewThreshold.jsp > ematStaticAlertTypes.jsp

Vulnerable Parameter(s):
[+] valfield_1
[+] value_1

Affected Module(s):
[+] createNewThreshold
[+] ematStaticAlertTypes
[+] Alert Settings - Main Listing

Affected Product(s):
[+] Dell SonicWALL GMS
[+] Dell SonicWALL Analyzer
[+] Dell SonicWALL UMA E5000

Proof of Concept (PoC):
The persistent input validation web vulnerability can be exploited by remote attackers with low privileged or restricted guest accounts and
low user interaction. For security demonstration or reproduce the vulnerability follow the information and steps below.

Location: Alert Settings

Inject via Add: Edit contents for alert type: Backed-Up Syslog Files

Execute: Create New Threshold


Manual steps to reproduce ...

1. Open the Sonicwall GMS appliance application and login with full restrictions as guest
2. Switch to the vulnerable Console > Events > Alert Settings section
3. Click Add Alert and a new blank window of the application will be opened
4. Click in the upcomings window in the Alert Types section the Edit Content link
5. Now, a new window opens "Edit contents for alert type: Backup Sys-Log Files
6. On top is a little plus button next to the Threshold value
9. A new window opens with Elements box ... Inject your payload (script code) to the description eval in the operator fields
10. After the inject to the input fields the attacker only needs to click the Add Element button on the buttom of the page
11. The code will be directly executed and is persistent saved as element in the specific section
12. Save the input via update and go back to the alert settings main section were the code execute occurs in the same connected value
13. Successful reproduced!

PoC: Alert Settings - Create New Threshold

Critical</option></select> </td><td class="tblData2" width="1">
<img src="Create%20New%20Threshold_files/1x1trans.gif"></td><td class="tblData2" align="center"
nowrap="nowrap"><input class="controlFont" name="disabled" value="1" type="checkbox"></td>
<td class="tblData2" width="1"><img src="Create%20New%20Threshold_files/1x1trans.gif"></td>
<td class="tblData2" align="center" nowrap="nowrap"><a href="#" onclick="deleteElement(1);">
<img src="Create%20New%20Threshold_files/trash.gif" alt="Delete this destination" border="0"></a></td>
<td class="tblData2" width="1"><img src="Create%20New%20Threshold_files/1x1trans.gif"></td></tr><tr><td></td>
<td class="tblData2" width="1"><img src="Create%20New%20Threshold_files/1x1trans.gif"></td><td colspan="5"
class="tblData2" align="left" nowrap="nowrap"> <font class="controlfont">Description: </font>
<input class="controlfont" size="64" name="description"
value="is equal to >" <[PERSISTENT INJECTED SCRIPT CODE!]" type="text"> >"<[PERSISTENT INJECTED SCRIPT CODE!]">"
onkeyup="enableAutoDesc(1,0);"></td><td class="tblData2"
width=1><img src="images/1x1trans.gif"></td>

Note: Please, feel free to read also the patch information provided in the solution section of the advisory document.

Solution - Fix & Patch:
The vulnerability can be patched by a secure parse, prevention filter mechanism or clean encode of the vulnerable value_1 and valfield_1 parameters.
Also restrict and escape the affected input field and output listing in the connected modules.

Resolution (DELL SonicWall):
We recommend existing users of Dell SonicWALL GMS/Analyzer/UMA 7.1 to apply SP1 (if they have not already done so), and then apply Hotfix 134235 to prevent cross-site scripting by unauthorized users. 7.1 SP1 and the Hotfix are available for download from www.mysonicwall.com. Users should log into mySonicWALL and click on Downloads > Download Center in the navigation panel on the left, then select “GMS/Analyzer” in the Software Type drop down menu.

Security Risk:
The security risk of the persistent input validation web vulnerability with filter bypass is estimated as medium(+).

Credits & Authors:
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com]

Disclaimer & Information:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties,
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-
Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business
profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some
states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation
may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases
or trade with fraud/stolen material.

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