The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity
High
AC
The successful attack depends on the evasion or circumvention of security-enhancing techniques in place that would otherwise hinder the attack. These include: Evasion of exploit mitigation techniques. The attacker must have additional methods available to bypass security measures in place. For example, circumvention of address space randomization (ASLR) or data execution prevention must be performed for the attack to be successful. Obtaining target-specific secrets. The attacker must gather some target-specific secret before the attack can be successful. A secret is any piece of information that cannot be obtained through any amount of reconnaissance. To obtain the secret the attacker must perform additional attacks or break otherwise secure measures (e.g. knowledge of a secret key may be needed to break a crypto channel). This operation must be performed for each attacked target.
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
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.
Below is a copy: Eikon Thomson Reuters 4.0.42144 File Permissions
SEC Consult Vulnerability Lab Security Advisory < 20200826-0 >
=======================================================================
title: Extensive file permissions on service executable
product: Eikon Thomson Reuters
vulnerable version: 4.0.42144
fixed version: -
CVE number: CVE-2019-10679
impact: High
homepage: eikon.thomsonreuters.com
found: 2019-03-18
by: Khalil Bijjou (Office CH)
SEC Consult Vulnerability Lab
An integrated part of SEC Consult
Europe | Asia | North America
https://www.sec-consult.com
=======================================================================
Vendor description:
-------------------
"Eikon is the financial analysis desktop and mobile solution that connects you t
relevant, trusted content, Reuters news, markets, liquidity pools, and colleagues."
Source: https://www.refinitiv.com/en/products/spot-matching-forwards-matching
Business recommendation:
------------------------
As long as the vendor did not release a patch for this vulnerability, we recommend
moving Eikon Thomson Reuters to a separate system outside the domain to which users
can connect to. Furthermore, we recommend to closely monitor any activities related
to Eikon Thomson Reuters.
Vulnerability overview/description:
-----------------------------------
The current file permissions of the directory
"C:\Program Files (x86)\Thomson Reuters)\Eikon" allow users of the group
Authenticated Users to modify files in the folder. As these files are executed
by the service that runs with SYSTEM privileges, it is possible to escalate
privileges and create a new user with administrator privileges.
Proof of concept:
-----------------
The service's executable file is writeable by members of the Authenticated
Users group. A user can create a malicious file that for example creates a
new user and adds him to the Administrators group and replace the service's
executable file with it.
As the service runs in the SYSTEM users context, the malicious file will be
executed the next time the service is started. As the SYSTEM user has the
highest privileges, the mentioned actions are successfully performed and a new
user will be created and added to the administrators group.
Creating a new user represents only an example. Other critical actions can be
performed instead.
Vulnerable / tested versions:
-----------------------------
The following version has been tested which was the latest version available at
the time of discovery:
* 4.0.42144
Vendor contact timeline:
------------------------
2019-04-09: Contacting vendor through the contact form in the homepage.
Service request number is 07521820.
2019-04-09: Received reply that they will supply a security contact.
2019-04-16: Sent reminder as no security contact has been supplied yet.
2019-04-23: Sent reminder #2.
2019-04-23: Vendor replied: "Thank you for your reminder, the release
date has been duly noted. As previously mentioned, I have
transferred your query to our security specialists already,
they will reach out to you if they deem it necessary."
2020-08-26: Release of security advisory.
Solution:
---------
As the vendor has not responded to any of our further requests, we are
currently unaware, whether a fix has been published or not. In any case,
we recommend to run the application on a separate server to which users
have to connect (e.g. via RDP).
Workaround:
-----------
We recommend enabling write permissions to administrative users only
and to adhere to updating best practices.
Advisory URL:
-------------
https://www.sec-consult.com/en/vulnerability-lab/advisories/index.html
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SEC Consult Vulnerability Lab
SEC Consult
Europe | Asia | North America
About SEC Consult Vulnerability Lab
The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It
ensures the continued knowledge gain of SEC Consult in the field of network
and application security to stay ahead of the attacker. The SEC Consult
Vulnerability Lab supports high-quality penetration testing and the evaluation
of new offensive and defensive technologies for our customers. Hence our
customers obtain the most current information about vulnerabilities and valid
recommendation about the risk profile of new technologies.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Interested to work with the experts of SEC Consult?
Send us your application https://www.sec-consult.com/en/career/index.html
Interested in improving your cyber security with the experts of SEC Consult?
Contact our local offices https://www.sec-consult.com/en/contact/index.html
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mail: research at sec-consult dot com
Web: https://www.sec-consult.com
Blog: http://blog.sec-consult.com
Twitter: https://twitter.com/sec_consult
EOF Khalil Bijjou / @2020
This information is provided for TESTING and LEGAL RESEARCH purposes only. All trademarks used are properties of their respective owners. By visiting this website you agree to Terms of Use and Privacy Policy and Impressum