Citrix this week announced patches for severe vulnerabilities in Virtual Apps and Desktops, as well as in Workspace apps for Windows and Linux.
Tracked as CVE-2023-24483, the Virtual Apps and Desktops vulnerability is described as a privilege escalation issue that allows an attacker with access to a Windows VDA as a standard Windows user to elevate privileges to System.
The security defect impacts all Citrix Virtual Apps and Desktops versions before 2212, as well as long term service release (LTSR) versions 2203 before CU2 and 1912 before CU6.
Citrix addressed two bugs in the Workspace app for Windows, which could be chained to elevate privileges and perform actions as a System user.
The first of the issues, CVE-2023-24484, could allow an attacker to write log files to a directory they do not have permission to write to, and the second flaw, CVE-2023-24485, allows them to escalate privileges.
To exploit these vulnerabilities, an attacker needs access to the system running a vulnerable version of the Workspace app. For the second bug, access is required at the time an administrator or System process installs or uninstalls the Workspace app.
These vulnerabilities impact Workspace App versions before 2212, 2203 LTSR before CU2, and 1912 LTSR before CU7 Hotfix 2 (19.12.7002).
Tracked as CVE-2023-24486, the vulnerability resolved this week in the Workspace app for Linux could allow an attacker to take over another user’s session.
“A vulnerability has been identified in Citrix Workspace app for Linux that, if exploited, may result in a malicious local user being able to gain access to the Citrix Virtual Apps and Desktops session of another user who is using the same computer from which the ICA session is launched,” Citrix explains.
The security bug impacts all versions of Citrix Workspace app for Linux before 2302.
Citrix recommends that all customers apply the available patches as soon as possible. The company makes no mention of any of these vulnerabilities being exploited in attacks.
According to the US Cybersecurity and Infrastructure Security Agency (CISA), an attacker could exploit these vulnerabilities to take over an impacted system.
Additional information on these vulnerabilities can be found in Citrix’s security bulletins.
Related: Citrix Patches Critical Vulnerability in Gateway, ADC
Related: Attackers Can Exploit Critical Citrix ADM Vulnerability to Reset Admin Passwords
