CVE-2023-28238 Overview
CVE-2023-28238 is a Remote Code Execution vulnerability affecting the Windows Internet Key Exchange (IKE) Protocol Extensions across a wide range of Microsoft Windows operating systems. The Internet Key Exchange protocol is a critical component used in IPsec VPN implementations to establish secure communications between network endpoints. A successful exploitation of this vulnerability could allow an authenticated attacker to execute arbitrary code remotely on affected systems.
Critical Impact
Remote code execution in the Windows IKE Protocol Extensions could allow attackers to compromise systems running IPsec VPN services, potentially gaining full control over affected Windows servers and workstations across the enterprise.
Affected Products
- Microsoft Windows 10 (versions 1507, 1607, 1809, 20H2, 21H2, 22H2)
- Microsoft Windows 11 (versions 21H2, 22H2)
- Microsoft Windows Server 2008 R2 SP1
- Microsoft Windows Server 2012 and R2
- Microsoft Windows Server 2016
- Microsoft Windows Server 2019
- Microsoft Windows Server 2022
Discovery Timeline
- April 11, 2023 - CVE-2023-28238 published to NVD
- November 21, 2024 - Last updated in NVD database
Technical Details for CVE-2023-28238
Vulnerability Analysis
This vulnerability resides in the Windows IKE Protocol Extensions, which handle the key exchange process for IPsec communications. The weakness is classified under CWE-591 (Sensitive Data Storage in Improperly Locked Memory), indicating that the vulnerability involves improper memory handling during IKE protocol operations.
The attack requires network access and low-level privileges but demands high attack complexity, meaning that successful exploitation depends on specific conditions being met. While no user interaction is required, the attacker must be authenticated to exploit this vulnerability. When successfully exploited, the vulnerability can result in complete compromise of confidentiality, integrity, and availability of the targeted system.
Root Cause
The root cause of CVE-2023-28238 stems from improper memory management within the IKE Protocol Extensions component. The vulnerability involves sensitive data being stored in memory that is not properly locked or protected, potentially allowing an attacker to manipulate memory contents during IKE protocol negotiations. This memory handling flaw can be leveraged to achieve code execution in the context of the affected service.
Attack Vector
The vulnerability is exploitable over the network, making it particularly concerning for systems running IPsec VPN services that are exposed to potentially untrusted networks. An attacker with low-level authentication privileges could craft malicious IKE protocol messages designed to trigger the memory handling vulnerability.
The exploitation scenario involves manipulating the IKE key exchange process to exploit the memory handling flaw. Due to the high complexity requirement, successful exploitation likely requires precise timing and specific system state conditions. The attack targets the ikeext.dll component responsible for handling IKE protocol extensions in Windows.
Detection Methods for CVE-2023-28238
Indicators of Compromise
- Unusual network traffic patterns involving IKE/IPsec protocols (UDP ports 500 and 4500)
- Unexpected crashes or service restarts of the IKE and AuthIP IPsec Keying Modules service (IKEEXT)
- Anomalous memory consumption patterns in processes associated with IPsec services
- Suspicious authentication attempts followed by IKE protocol activity
Detection Strategies
- Monitor Windows Event Logs for IKEEXT service errors or unexpected restarts (Event ID 7036 in System log)
- Deploy network intrusion detection rules to identify malformed IKE protocol packets
- Implement endpoint detection to monitor for anomalous behavior in ikeext.dll and related IPsec components
- Enable audit logging for IPsec policy changes and VPN connection attempts
Monitoring Recommendations
- Configure SentinelOne to monitor for suspicious process behavior related to IKE services
- Set up alerts for repeated IKE negotiation failures from single sources
- Monitor for privilege escalation attempts following IPsec service interactions
- Track patch compliance across all affected Windows systems in the environment
How to Mitigate CVE-2023-28238
Immediate Actions Required
- Apply the Microsoft security update immediately on all affected Windows systems
- Prioritize patching for systems running IPsec VPN services exposed to untrusted networks
- Review and restrict network access to IKE/IPsec services where possible
- Ensure authentication requirements for VPN connections are properly enforced
Patch Information
Microsoft has released security updates to address this vulnerability as part of their security update process. Organizations should obtain the appropriate patches from the Microsoft Security Response Center (MSRC) update guide. The patches address the memory handling vulnerability in the IKE Protocol Extensions across all affected Windows versions.
Workarounds
- If IPsec VPN services are not required, consider disabling the IKE and AuthIP IPsec Keying Modules service (IKEEXT)
- Implement network segmentation to limit exposure of systems running IKE services
- Deploy additional network-level filtering to restrict IKE traffic to trusted sources only
- Consider using alternative VPN solutions until patches can be applied
# Disable IKE service if not required (temporary workaround)
sc config IKEEXT start= disabled
sc stop IKEEXT
# Verify service status
sc query IKEEXT
# Note: Only disable if IPsec VPN functionality is not needed
# Re-enable after patching with: sc config IKEEXT start= auto
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
