CVE-2022-35756 in Windows
Summary
by MITRE • 05/31/2023
Windows Kerberos Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 06/19/2026
This vulnerability represents a critical elevation of privilege flaw in the Windows Kerberos authentication system that allows attackers to escalate their privileges from standard user to system level access. The vulnerability stems from improper validation of authentication tokens within the Kerberos protocol implementation, specifically affecting how the system processes ticket granting tickets and service tickets. Attackers can exploit this weakness by crafting malicious authentication requests that bypass normal security checks, potentially enabling them to gain unauthorized administrative access to target systems. The flaw exists at the core authentication layer where Kerberos ticket validation routines fail to properly verify the integrity and authenticity of received tickets, creating a pathway for privilege escalation attacks.
The technical implementation of this vulnerability involves the exploitation of insufficient input sanitization within the Kerberos authentication process. When a user submits a Kerberos ticket for validation, the system should perform comprehensive checks on ticket attributes including principal names, service identifiers, and cryptographic signatures. However, the vulnerable implementation fails to adequately validate these elements, allowing attackers to manipulate ticket parameters to gain elevated privileges. This flaw can be leveraged through various attack vectors including network-based exploitation or local privilege escalation scenarios where an attacker already has limited access to the system. The vulnerability affects multiple Windows versions including server and desktop operating systems, making it particularly dangerous in enterprise environments where Kerberos is extensively used for authentication.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential full system compromise and lateral movement capabilities within network environments. Once an attacker successfully exploits this vulnerability, they can gain system-level privileges without requiring additional authentication credentials, effectively bypassing standard security controls. This creates a significant risk for organizations relying on Kerberos for authentication, as the attack can be executed with minimal detection and can potentially provide access to sensitive data, critical systems, and network resources. The vulnerability's impact is particularly severe in domain environments where Kerberos authentication is the primary method for user and service authentication, enabling attackers to move laterally across the network and potentially compromise entire domain controllers.
Mitigation strategies for this vulnerability should include immediate deployment of Microsoft security patches and updates to address the specific Kerberos validation flaws. Organizations should also implement enhanced monitoring of Kerberos authentication events and establish baseline behaviors for normal ticket validation processes to detect anomalous activity. Network segmentation and access controls should be strengthened to limit potential lateral movement even if an attacker successfully exploits the vulnerability. Security teams should conduct thorough vulnerability assessments to identify systems running vulnerable versions of Windows and prioritize patch deployment based on risk exposure. Additional defensive measures include implementing strict Kerberos ticket policies, enabling audit logging for authentication events, and monitoring for suspicious authentication patterns that may indicate exploitation attempts.
This vulnerability aligns with several common weakness enumerations including CWE-220 which addresses improper input validation in authentication systems, and CWE-287 which covers improper authentication mechanisms. The attack patterns associated with this vulnerability map to multiple ATT&CK techniques including T1078 for valid accounts and T1566 for credential harvesting. The exploitation of such vulnerabilities often involves techniques described in T1550 which covers use of stolen credentials, making comprehensive monitoring of authentication events critical for early detection. Organizations should also consider implementing zero trust principles and multi-factor authentication mechanisms to reduce the impact of credential compromise and provide additional layers of security beyond traditional Kerberos authentication.