CVE-2024-49122: Windows 10 1507 MSMQ RCE Vulnerability

CVE-2024-49122 Overview

CVE-2024-49122 is a remote code execution vulnerability affecting Microsoft Message Queuing (MSMQ), a Windows component that enables applications to communicate across networks and systems. This vulnerability combines a use-after-free condition (CWE-416) with a race condition (CWE-362), allowing unauthenticated remote attackers to execute arbitrary code on vulnerable Windows systems where MSMQ is enabled.

Critical Impact

Successful exploitation enables remote attackers to execute arbitrary code with SYSTEM privileges on affected Windows systems without authentication, potentially leading to complete system compromise.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
• Microsoft Windows 11 (versions 22H2, 23H2, 24H2)
• Microsoft Windows Server 2008, 2012, 2016, 2019, 2022, 2022 23H2, and 2025

Discovery Timeline

• December 12, 2024 - CVE-2024-49122 published to NVD
• January 14, 2025 - Last updated in NVD database

Technical Details for CVE-2024-49122

Vulnerability Analysis

This vulnerability exists within the Microsoft Message Queuing (MSMQ) service, which processes messages across distributed applications. The flaw combines two dangerous weakness classes: a use-after-free vulnerability (CWE-416) and a race condition (CWE-362).

The use-after-free component occurs when MSMQ continues to reference memory that has already been freed during message processing. When combined with the race condition, an attacker can manipulate the timing of memory operations to gain control over freed memory regions. This memory corruption can be leveraged to achieve arbitrary code execution in the context of the MSMQ service, which typically runs with SYSTEM privileges.

While successful exploitation requires the attacker to win a race condition, the network-accessible nature of the vulnerability and the absence of authentication or user interaction requirements make it a significant threat to exposed systems.

Root Cause

The vulnerability stems from improper synchronization in MSMQ's memory management routines. When processing certain message sequences, MSMQ fails to properly handle concurrent operations, leading to a condition where memory is freed while still being referenced by another thread. This creates a window where an attacker can potentially reallocate the freed memory with controlled data, leading to code execution when the original reference is subsequently dereferenced.

Attack Vector

The attack is conducted over the network against systems with the MSMQ service enabled and exposed. The attacker sends specially crafted messages to the target system's MSMQ service port (typically TCP/1801). By timing the messages to exploit the race condition, the attacker can trigger the use-after-free condition and gain code execution. No authentication or user interaction is required, though the attacker must win the race condition for successful exploitation.

The vulnerability mechanism involves manipulating MSMQ message handling to trigger the use-after-free condition during concurrent processing. Technical details regarding the specific exploitation methodology can be found in the Microsoft Security Update Guide.

Detection Methods for CVE-2024-49122

Indicators of Compromise

• Unusual network traffic patterns to TCP port 1801 (MSMQ default port)
• Crash dumps or unexpected restarts of the MSMQ service (mqsvc.exe)
• Suspicious processes spawned as children of the MSMQ service
• Memory access violations logged in Windows Event Logs related to MSMQ

Detection Strategies

• Monitor for anomalous MSMQ traffic volumes or patterns from external sources
• Implement network segmentation and firewall rules to control MSMQ service access
• Deploy endpoint detection and response (EDR) solutions to detect exploitation attempts targeting memory corruption
• Use SentinelOne's behavioral AI to identify suspicious activity related to MSMQ service exploitation

Monitoring Recommendations

• Enable detailed logging for MSMQ service events in Windows Event Viewer
• Configure alerts for MSMQ service crashes or unexpected restarts
• Monitor network connections to TCP port 1801 from untrusted networks
• Implement SentinelOne Singularity platform for real-time threat detection and automated response

How to Mitigate CVE-2024-49122

Immediate Actions Required

• Apply Microsoft's December 2024 security updates immediately to all affected systems
• Disable the MSMQ service on systems where it is not required
• Restrict network access to MSMQ ports (TCP/1801) using firewalls to trusted sources only
• Isolate systems running MSMQ from untrusted network segments

Patch Information

Microsoft has released security updates to address this vulnerability as part of their December 2024 Patch Tuesday release. The patches are available through Windows Update, Microsoft Update Catalog, and Windows Server Update Services (WSUS). Organizations should prioritize patching systems where MSMQ is enabled and network-accessible. Detailed patch information is available in the Microsoft Security Update Guide.

Workarounds

• Disable the MSMQ feature if not required using Windows Features or PowerShell
• Block TCP port 1801 at the network perimeter and internal firewalls
• Implement network segmentation to limit exposure of MSMQ services
• Use host-based firewalls to restrict MSMQ access to authorized systems only

# Check if MSMQ service is installed and running
Get-Service -Name MSMQ -ErrorAction SilentlyContinue

# Disable MSMQ feature if not required
Disable-WindowsOptionalFeature -Online -FeatureName MSMQ-Server

# Block MSMQ port via Windows Firewall
New-NetFirewallRule -DisplayName "Block MSMQ Inbound" -Direction Inbound -LocalPort 1801 -Protocol TCP -Action Block