SEC Consult Vulnerability Lab Security Advisory < 20240925-0 >

          title: Uninstall Password Bypass  
        product: BlackBerry CylanceOPTICS Windows Installer Package  

vulnerable version: CylanceOPTICS <3.3 MR2
CylanceOPTICS <3.2 MR5
fixed version: CylanceOPTICS 3.3 MR2
CylanceOPTICS 3.2 MR5
CVE number: CVE-2024-35214
impact: high
homepage: https://www.blackberry.com/us/en/support/cylance
found: 2023-12-12
by: Initially by Rene Grubmair (Greiner)
P. Espernberger (Office Leonding)
M. Engleitner (Office Leonding)
SEC Consult Vulnerability Lab

                 An integrated part of SEC Consult, an Eviden business  
                 Europe | Asia

                 https://www.sec-consult.com

=======================================================================

Vendor description:

“CylanceOPTICS is an endpoint detection and response solution that collects
and analyzes forensic data from devices to identify and resolve threats
before they impact your organization’s users and data.”

Source: https://docs.blackberry.com/en/unified-endpoint-security/blackberry-ues/overview/What-is-BlackBerry-Optics

Business recommendation:

The vendor provides a patched version which should be installed immediately.

SEC Consult highly recommends to perform a thorough security review of the
product conducted by security professionals to identify and resolve potential
further security issues.

Vulnerability overview/description:

1. Uninstall Password Bypass (CVE-2024-35214)
   Due to the quiet (un-)installation feature offered by the CylanceOPTICS
   application, the uninstaller can be called directly without requiring
   a previously set uninstall password.

In order to exploit this vulnerability, an attacker must have local admin
rights.

Proof of concept:

1. Uninstall Password Bypass (CVE-2024-35214)
   The path to the MSI uninstaller can be found by searching the
   Windows Registry for “CylanceOPTICS” which results in the following
   node containing uninstall information for the 64bit application:

HKLM\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall{6e96194b-ca7b-40a4-badd-7eac94ea62c7}

To uninstall CylanceOPTICS without being prompted for a password,
the QuietUninstallString command is executed as privileged user on
the system.

“C:\ProgramData\Package Cache{6e96194b-ca7b-40a4-badd-7eac94ea62c7}\CylanceOPTICSSetup.exe” /uninstall /quiet

Afterwards, the CylanceOPTICS application is successfully removed.

Vulnerable / tested versions:

The following version has been tested by SEC Consult which was the most
recent version available at the time of the test:

• 3.2.2199.0

According to the vendor, all previous versions are affected:

• CylanceOPTICS <3.3 MR2
• CylanceOPTICS <3.2 MR5

Vendor contact timeline:

2024-02-02: Contacting vendor through [email protected], case
BIRT2024-00128 was created
2024-02-02: Auto-response, case is being tracked as # BIRT2024-00128
2024-02-07: Vendor requests settings of the CylanceConsole device.
Vendor is currently attempting to reproduce the vulnerability.
2024-02-08: The requested settings were provided.
2024-02-09: Vendor confirms the Uninstall Password Bypass vulnerability.
Additional information (log files) are requested.
Clarification of the impact of the vulnerability is requested.
2024-02-15: Explanation has been sent. Log files could not be provided
as the device has already been reset.
2024-02-15: The vulnerability was escalated to the development team.
2024-02-23: Short update was provided outlining the current plan to
fix the vulnerability until summer 2024.
Vendor commits to bi-weekly updates on their progress.
2024-04-19: Expected release date (June 3rd) was communicated and
the CVE number was provided.
2024-05-21: Coordination of the joint release date (2024-06-11) and
providing the updated security advisory and new CVE number.
2024-06-07: Vendor released CylanceOPTICS 3.3 MR1 and CylanceOPTICS 3.2 MR4
on 4th June. But requests advisory disclosure to be delayed to
10th September because of identified weakness in current solution.
2024-08-20: Vendor releases new version 3.3 MR2 and 3.2 MR5.
2024-09-25: Coordinated release of security advisory.

SEC Consult was informed about the progress bi-weekly.
Only the most relevant information is included in the timeline.

Solution:

The vendor provides the following patched versions to their customers:

• CylanceOPTICS 3.3 MR2
• CylanceOPTICS 3.2 MR5

In addition to the updated versions, the vendor has released an
optional script which customers can run to remove the old version and replace
it with the update. New customers, or customers who uninstall /
reinstall will not need to run the script, nor will existing customers
who have not configured an Uninstall password.

The vendor provides the following security notes with further information:
https://support.blackberry.com/pkb/s/article/140080

Workaround:

As a workaround, it is possible to delete the affected CylanceOPTICSSetup.exe
binary.

Advisory URL:

https://sec-consult.com/vulnerability-lab/

SEC Consult Vulnerability Lab  
An integrated part of SEC Consult, an Eviden business  
Europe | Asia

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EOF M. Engleitner, P. Espernberger / @2024