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
High
PR
The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
SEC Consult Security Advisory < 20071101-0 >
========================================================================
=============
title: Multiple vulnerabilities in SonicWALL SSL-VPN
Client
* Deletion of arbitrary files on the client
* Arbitrary code execution thru various buffer
overflows
program: SonicWALL SSL-VPN
vulnerable version: SonicWALL SSL-VPN 1.3.0.3
WebCacheCleaner ActiveX Control 1.3.0.3
NeLaunchCtrl ActiveX Control 2.1.0.49
homepage: www.sonicwall.com
found: 04-23-2007
by: lofi42
perm. link: http://www.sec-consult.com/303.html
========================================================================
=============
Vendor description:
---------------
SonicWALL SSL-VPN solutions can be configured to provide users with
easy-to-use, secure and clientless remote access to a broad range of
resources on the corporate network.
Vulnerabilty overview:
---------------
The SonicWALL SSL-VPN solution comes with various ActiveX Controls which
allows users to access the VPN with Internet Explorer. These controls
contain various vulnerabilities. An attacker could take control of the
affected clients by placing exploit code on a webserver. He would then
have to entice VPN users to visit the website, e.g. by conducting a
phishing attack. Various other attack vectors exist (DNS redirection,
owning an intranet website, ...).
Vulnerability details:
---------------
1.) Deletion of arbitrary files
The WebCacheCleaner ActiveX Control provides the method FileDelete()
which, working as advertised, allows the attacker to delete arbitrary
files on the client.
=== Proof of Concept 1 (VBScript) ===
dim o
Set o = CreateObject("MLWebCacheCleaner.WebCacheCleaner.1")
o.FileDelete("c:blabla")
=== /Proof of Concept 1 ===
2.) Multiple buffer overflows
A stack-based buffer overflow exists in the AddRouteEntry() method of
the NELaunchCtrl ActiveX Control. Specifically, the second paramter to
this method is copied to into a stack buffer without length validiation.
Use the following to make the process jump into UVWX-land:
o.AddRouteEntry ("", "ABCDEFGHIJKLMNOPQRSTUVWX");
Additionally, the following properties suffer from Unicode overflows:
serverAddress
sessionId
clientIPLower
clientIPHigher
userName
domainName
dnsSuffix
=== Proof of Concept 2 ===
A code execution exploit will not be released to the public. However, as
exploitation is trivial, we strongly advise to perform an update.
vendor status:
---------------
vendor notified: 2007-05-21
vendor response: 2007-05-21
patch available: September 2007
The issues have been fixed with version 2.1 of SSL-VPN 200 and version
2.5 of SSL-VPN 2000/4000.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* The vulnerabilities described above have been purchased by
SEC Consult from an independent security researcher.
In the research bonus programme, SEC Consult is looking for security
vulnerabilities in common software products. For more information,
contact research [at] sec-consult [dot] com
EOF Bernhard Mueller / SEC Consult
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