Check Point Advisories

Citrix Presentation Server Client ActiveX Control Buffer Overflow

Vulnerability
Protection

Check Point Reference:	CPAI-2023-1207
Date Published:	28 Nov 2023
Severity:	High
Last Updated:	Tuesday 28 November, 2023
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Citrix Systems ICA Client prior to 9.230
Vulnerability Description	There exists a buffer overflow vulnerability in the ICA Client ActiveX control in Citrix Presentation Server Client. The flaw is due to improper handling of parameters in the function of the ActiveX control. By persuading the target user to visit a malicious web site, an attacker may possibly execute arbitrary code with privileges of the currently logged in user.If an attack attempt is unsuccessful in injecting and executing arbitrary code, the application using the vulnerable ICA Client ActiveX Control might terminate abnormally.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Citrix Presentation Server Client ActiveX Control Buffer Overflow protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Web Client Enforcement Violation.
Attack Information: Citrix Presentation Server Client ActiveX Control Buffer Overflow