CVE-2023-21554 Overview
Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability exposes several versions of Windows, allowing attackers to execute arbitrary code in the context of the highly privileged 'SYSTEM' account.
Critical Impact
This vulnerability allows for complete system takeover if exploited successfully.
Affected Products
- Microsoft Windows 10 1607
- Microsoft Windows 10 1809
- Microsoft Windows 10 20H2
Discovery Timeline
- Not Available - Vulnerability discovered by Not Available
- Not Available - Responsible disclosure to Microsoft
- Not Available - CVE CVE-2023-21554 assigned
- Not Available - Microsoft releases security patch
- 2023-04-11 - CVE CVE-2023-21554 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2023-21554
Vulnerability Analysis
The vulnerability exists due to improper validation of input in MSMQ, allowing an attacker to craft a special network packet that may lead to remote code execution.
Root Cause
Improper input validation in Message Queuing services can be triggered by specially crafted packets sent over the network.
Attack Vector
Network-based exploitation: An attacker can exploit this vulnerability remotely by sending malicious packets to the MSMQ service.
// Example exploitation code (sanitized)
char buffer[256];
strcpy(buffer, "AttackerControlledData");
Detection Methods for CVE-2023-21554
Indicators of Compromise
- Unusual network traffic to MSMQ port
- Unexpected MSMQ service crashes
- Unauthorized changes to system files
Detection Strategies
Utilize network monitoring to capture unusual packet flows directed at MSMQ ports. Employ endpoint detection tools to monitor for unusual service behavior and potential execution of unauthorized commands.
Monitoring Recommendations
Ensure SIEM systems are configured to alert on excessive use of MSMQ ports and monitor for crash logs related to the MSMQ service.
How to Mitigate CVE-2023-21554
Immediate Actions Required
- Disable MSMQ on systems where it is not essential.
- Apply the security patch provided by Microsoft immediately.
- Implement network segmentation to limit MSMQ exposure.
Patch Information
Microsoft has released patches for affected systems. See Microsoft Security Response Center for the latest updates.
Workarounds
If you cannot immediately apply the patch, consider disabling MSMQ until patches can be applied. Additionally, limit network access to MSMQ services using firewall rules.
# Configuration example
netsh advfirewall firewall add rule name="Block MSMQ" protocol=TCP dir=in localport=1801 action=block
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
