The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope
S
An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
Confidentiality
Low
C
There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity
Low
I
Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
Title:
======
SonicWall Email Security 7.4.1.x - Persistent Web Vulnerability
Date:
=====
2012-12-21
References:
===========
http://www.vulnerability-lab.com/get_content.php?id=768
VL-ID:
=====
768
Common Vulnerability Scoring System:
====================================
4.1
Introduction:
=============
While most businesses now have some type of anti-spam protection, many must deal with cumbersome
management, frustrated users, inflexible solutions, and a higher-than-expected total cost of ownership.
SonicWALL Email Security can help. Elegantly simple to deploy, manage and use, award-winning SonicWALL
Email Security solutions employ a variety of proven and patented technology designed to block spam and
other threats effectively, easily and economically. With innovative protection techniques for both
inbound and outbound email plus unique management tools, the Email Security platform delivers superior
email protection todaywhile standing ready to stop the new attacks of tomorrow.
SonicWALL Email Security can be flexibly deployed as a SonicWALL Email Security Appliance, as a software
application on a third party Windows server, or as a SonicWALL Email Security Virtual Appliance in a
VMW® environment. The SonicWALL Email Security Virtual Appliance provides the same powerful protection as a
traditional SonicWALL Email Security appliance, only in a virtual form, to optimize utilization,
ease migration and reduce capital costs.
(Copy of the Vendor Homepage: http://www.sonicwall.com/us/products/Anti-Spam_Email_Security.html)
Abstract:
=========
The Vulnerability Laboratory Research Team discovered a persistent web vulnerabilities in the official Dell SonicWall Email Security (7.4.1.7429) Application.
Report-Timeline:
================
2012-11-18:Researcher Notification & Coordination
2012-11-20:Vendor Notification
2012-11-21:Vendor Response/Feedback
2012-12-17:Vendor Fix/Patch (v7.4.2)
2012-12-21:Public Disclosure
Status:
========
Published
Affected Products:
==================
DELL
Product: SonicWall - Email Security v7.4.1.7429
Exploitation-Technique:
=======================
Remote
Severity:
=========
Medium
Details:
========
A persistent input validation vulnerability is detected in the official Dell SonicWall Email Security (7.4.1.7429) Application.
The vulnerability typus allows an attacker to inject own malicious script code in the vulnerable module on application side (persistent).
The vulnerability is located in the Host Konfiguration > Einstellungen für CIFS-Bereitstellung > section when processing to request via
the `Bereistellunge testen` module the bound vulnerable [Name des freigegebenen Laufwerks] [Benutzer-ID Remoteanmeldung] [Kennwort Remoteanmeldung] application parameters. The persistent injected script code will be executed directly out of the `system command failed web application exception-handling.
The vulnerability can be exploited with a low (restricted) privileged application user account and low or medium required user interaction.
Successful exploitation of the vulnerability result in persistent session hijacking, persistent phishing, external redirect, external
malware loads and persistent vulnerable module context manipulation.
Vulnerable Section(s):
[+] System > Host Konfiguration > Einstellungen CIFS-Bereitstellung
Vulnerable Module(s):
[+] [Bereitstellung testen] - Exception Handling
Vulnerable Parameter(s):
[+] [Name des freigegebenen Laufwerks] [Benutzer-ID Remoteanmeldung] [Kennwort für Remoteanmeldung]
Proof of Concept:
=================
The persistent web vulnerabilities can be exploited by remote attackers with low privileged application user account & low required user inter action.
For demonstration or reproduce ...
Review: [Bereitstellung testen] - Exception Handling [System Command Failed]
<div id="modalText" class="bubble_text">{ 127.0.0.1:337 →"><[PERSISTENT INJECTED SCRIPT CODE!]")" <="" }
<br=""><[PERSISTENT INJECTED SCRIPT CODE!]>System command failed.</div>
Review: settings_host_config.html
<div id="contentSection">
<div style="border-radius: 10px 10px 10px 10px; display: none;" id="modalBubble" class="warning_bubble_content">
<div id="modalTitle" class="bubble_title">Aktualisieren.</div>
<div id="modalText" class="bubble_text">{ 127.0.0.1 → "><[PERSISTENT INJECTED SCRIPT CODE!];)" <="" }<br="">
<[PERSISTENT INJECTED SCRIPT CODE!]>System command failed.</div>
</div>
Solution:
=========
To patch/fix the persistent web vulnerabilities parse the exception-handling output parameter listing.
Restrict the input fields (parameters) and disallow special chars and obviously forbidden strings.
2012-12-17:Vendor Fix/Patch (v7.4.2)
Note: The vulnerability has been addressed by sonicwall in december 2012.
Sonicwall provids all the customers an upgrade/update to version 7.4.2.
Risk:
=====
The security risk of the persistent web vulnerabilities are estimated as medium(+).
Credits:
========
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected])
Disclaimer:
===========
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