ZDI-CAN-29220: ZDI-26-554: Parallels RAS Client RDP Backend Service Exposed Dangerous Function Local Privilege Escalation Vulnerability
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels RAS Client. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the RAS RDP Backend Service. The issue results from an exposed dangerous function. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
Other sources
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels RAS Client. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-13121.
— ZDI
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Parallels RAS Clientto a version that resolves this vulnerability.Patch ZDI-26-554 - Compensating control
Mitigate local exploitation of the RAS RDP Backend Service exposed dangerous function by reducing the ability for low-privileged code execution on the target system (since an attacker must first gain low-privileged code execution to exploit the vulnerability).
Event History
Frequently Asked Questions
What is the severity of ZDI-CAN-29220?
ZDI-CAN-29220 has a CVSS rating of 7.8, indicating a high severity level.
How do I fix ZDI-CAN-29220?
To fix ZDI-CAN-29220, update to the latest version of Parallels RAS Client that includes patched functionality.
Who is affected by ZDI-CAN-29220?
ZDI-CAN-29220 affects installations of Parallels RAS Client where local attackers can execute low-privileged code.
What type of attack does ZDI-CAN-29220 enable?
ZDI-CAN-29220 enables local privilege escalation attacks on vulnerable systems.
What is required for an attacker to exploit ZDI-CAN-29220?
An attacker must first be able to execute low-privileged code on the target system to exploit ZDI-CAN-29220.