CVE-2024-29053: Microsoft Defender for IoT RCE Vulnerability

CVE-2024-29053 Overview

CVE-2024-29053 is a remote code execution vulnerability affecting Microsoft Defender for IoT. The flaw stems from improper limitation of a pathname to a restricted directory, classified under [CWE-22] path traversal and [CWE-36] absolute path traversal. An authenticated attacker with low privileges can exploit the vulnerability over the network to execute arbitrary code on affected systems. Microsoft published the advisory on April 9, 2024, and the issue carries a CVSS 3.1 base score of 8.8. The EPSS probability is 3.199% at the 87th percentile, indicating elevated relative likelihood of exploitation activity.

Critical Impact
Successful exploitation allows authenticated network attackers to achieve remote code execution on Microsoft Defender for IoT deployments, compromising confidentiality, integrity, and availability.

Affected Products

Microsoft Defender for IoT (all versions prior to the April 2024 security update)
Deployments exposing the Defender for IoT management interface to network-reachable clients
On-premises Defender for IoT sensors and management consoles

Discovery Timeline

2024-04-09 - CVE-2024-29053 published to NVD
2024-04-09 - Microsoft releases security update for CVE-2024-29053
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-29053

Vulnerability Analysis

The vulnerability resides in file-handling logic within Microsoft Defender for IoT. The service fails to properly validate user-supplied path components before performing file operations. An authenticated attacker can craft requests containing traversal sequences or absolute paths that escape the intended directory. The flaw enables writing or accessing files outside the designated storage location, which can be leveraged to execute code in the context of the Defender for IoT service.

The CWE mapping identifies both [CWE-22] Improper Limitation of a Pathname to a Restricted Directory and [CWE-36] Absolute Path Traversal. These weaknesses combined allow attackers to bypass directory containment through crafted path inputs. The impact scope remains unchanged, meaning the exploited component and affected resources share the same security authority.

Root Cause

The root cause is insufficient input validation on filename and path parameters accepted by the Defender for IoT interface. The application does not canonicalize paths or reject traversal sequences such as ../ or absolute paths before file operations occur. This allows attackers to direct file writes to arbitrary locations reachable by the service account.

Attack Vector

Exploitation requires network access and low-privileged authentication to the Defender for IoT service. The attacker submits crafted file upload or file management requests with malicious path parameters. No user interaction is required. Successful exploitation places attacker-controlled content in a location where it will be executed by the service, achieving remote code execution.

No public proof-of-concept exploit code has been released for CVE-2024-29053. Refer to the Microsoft Security Update Guide for authoritative technical details.

Detection Methods for CVE-2024-29053

Indicators of Compromise

Unexpected files written to system directories or web-accessible paths on Defender for IoT hosts
Authentication events from low-privileged accounts followed by file upload activity containing .. sequences or absolute path parameters
Anomalous child processes spawned by the Defender for IoT service account
Outbound network connections initiated by Defender for IoT service processes to untrusted destinations

Detection Strategies

Inspect HTTP request logs for path traversal patterns such as ..%2f, ..\, and absolute paths in filename parameters
Correlate authentication activity against Defender for IoT with subsequent file system modifications outside expected directories
Alert on new executable files, scripts, or web shells appearing under Defender for IoT installation paths

Monitoring Recommendations

Enable verbose logging on the Defender for IoT management console and forward events to a centralized SIEM
Baseline normal file system activity for Defender for IoT services and alert on deviations
Monitor for unexpected process execution originating from the Defender for IoT service account

How to Mitigate CVE-2024-29053

Immediate Actions Required

Apply the Microsoft security update referenced in the Microsoft Security Update Guide to all Defender for IoT deployments
Audit authenticated accounts with access to Defender for IoT and remove unnecessary access
Review recent file system changes on Defender for IoT hosts for signs of prior exploitation

Patch Information

Microsoft released a security update on April 9, 2024, that addresses CVE-2024-29053. Administrators should consult the Microsoft Security Update Guide for the specific build numbers and update packages that apply to their deployment.

Workarounds

Restrict network access to the Defender for IoT management interface using firewall rules and allow-lists
Enforce strong authentication and least-privilege principles for all accounts with Defender for IoT access
Segment Defender for IoT infrastructure from general corporate networks to limit exposure to authenticated attackers