CVE-2022-21849 in Windows
Summary
by MITRE • 01/12/2022
Windows IKE Extension Remote Code Execution Vulnerability.
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Analysis
by VulDB Data Team • 11/15/2024
The Windows IKE Extension Remote Code Execution Vulnerability represents a critical security flaw within the Internet Key Exchange protocol implementation on Microsoft Windows systems. This vulnerability specifically affects the IKE extension component that handles secure key exchange for virtual private networks and other network security protocols. The flaw exists in how the system processes certain IKE messages and extensions, creating an opportunity for remote attackers to execute arbitrary code on affected systems. The vulnerability impacts multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it particularly concerning for enterprise environments that rely heavily on Windows infrastructure. The issue stems from improper validation of input parameters within the IKE extension processing logic, allowing malicious actors to craft specially crafted packets that trigger buffer overflows or other memory corruption conditions.
The technical exploitation of this vulnerability occurs through the manipulation of IKE protocol messages that are processed by the Windows IKE extension service. When a vulnerable system receives specially crafted IKE packets containing malformed extension data, the processing routine fails to properly validate the input parameters, leading to memory corruption that can be leveraged for remote code execution. This type of vulnerability falls under CWE-121, which describes stack-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read errors. The attacker does not require authentication to exploit this vulnerability, making it particularly dangerous as it can be triggered through network-based attacks without prior access credentials. The exploitation process typically involves sending malformed IKE messages to the target system's network interface, which then processes these messages through the vulnerable IKE extension handler.
The operational impact of CVE-2022-21849 extends beyond simple remote code execution, as successful exploitation can lead to complete system compromise and potential lateral movement within network environments. Attackers who successfully exploit this vulnerability can gain elevated privileges on affected systems, potentially allowing them to establish persistent backdoors, exfiltrate sensitive data, or use the compromised systems as launching points for further attacks. This vulnerability directly maps to several ATT&CK techniques including T1071.004 for application layer protocol usage and T1059.001 for command and scripting interpreter. Organizations running Windows systems are particularly vulnerable as the IKE extension service is commonly enabled and active on systems that support VPN connections, IPsec security policies, and other network security features. The vulnerability's network-based nature means that attackers can target systems from external networks, potentially bypassing traditional perimeter defenses.
Mitigation strategies for CVE-2022-21849 should prioritize immediate patch deployment through Microsoft's regular security updates, as the vendor has released patches addressing this specific vulnerability. Network administrators should implement perimeter filtering to restrict IKE traffic to only trusted sources, particularly blocking UDP port 500 and UDP port 4500 which are commonly used by IKE protocols. The implementation of network segmentation and microsegmentation can help limit the potential impact of successful exploitation attempts. Organizations should also consider disabling IKE extension services if they are not actively required for network operations, though this may impact legitimate VPN and security protocol functionality. Monitoring for unusual IKE traffic patterns and implementing intrusion detection systems that can identify malformed IKE messages can provide additional layers of defense. Security teams should also conduct regular vulnerability assessments to identify systems that may not have received the necessary patches and establish automated patch management processes to ensure timely remediation across all networked systems.