CVE-2024-28878: IO-1020 Micro ELD RCE Vulnerability

CVE-2024-28878 Overview

CVE-2024-28878 affects the IO-1020 Micro Electronic Logging Device (ELD), a telematics device used in commercial vehicles to record driver hours-of-service data. The device downloads source code or executables from an adjacent network location and executes that code without sufficient verification of its origin or integrity. An attacker on the adjacent network can deliver malicious code to the device and trigger execution. The weakness is classified under CWE-494: Download of Code Without Integrity Check. CISA published guidance for this issue in advisory ICSA-24-093-01.

Critical Impact

An adjacent-network attacker can push unverified code to the IO-1020 Micro ELD and achieve arbitrary code execution on a safety-relevant in-vehicle device.

Affected Products

• IO-1020 Micro ELD (Electronic Logging Device)
• Deployments connected over short-range wireless or adjacent vehicle networks
• Fleet telematics environments relying on the IO-1020 Micro ELD firmware update path

Discovery Timeline

• 2024-04-12 - CVE-2024-28878 published to the National Vulnerability Database
• 2024-04-02 - CISA publishes ICS advisory ICSA-24-093-01
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2024-28878

Vulnerability Analysis

The IO-1020 Micro ELD retrieves code from an adjacent source and executes it without validating where the code originated or whether it has been tampered with. There is no cryptographic signature check, no certificate pinning, and no integrity hash comparison enforced before execution. An attacker positioned on the same adjacent network can substitute attacker-controlled binaries for legitimate ones. Because the device runs the substituted code with its own privileges, the attacker inherits full control of the ELD process and its access to vehicle telematics data. The flaw maps to [CWE-494] and represents an Insecure Code Update vulnerability typical of embedded IoT devices that rely on transport-level trust rather than code-level trust.

Root Cause

The firmware update and code-loading routines lack cryptographic verification primitives. The device trusts any peer reachable on the adjacent network to supply executable payloads. Authentication of the code source is either absent or implemented only at the network layer, which an attacker on the same segment can satisfy. No integrity manifest, signed package format, or secure boot chain protects the executed code.

Attack Vector

The attack vector is the adjacent network, meaning the attacker must reach the device over a directly connected link such as Bluetooth, Wi-Fi, or an in-vehicle bus rather than over the public internet. The attacker hosts a malicious payload on a reachable endpoint and either races, redirects, or impersonates the legitimate code source. When the IO-1020 Micro ELD fetches its next code update, it pulls and runs the attacker payload. No user interaction and no prior authentication on the device are required.

No verified public proof-of-concept code is available. See the CISA ICS Advisory ICSA-24-093-01 for technical details published by the coordinating authority.

Detection Methods for CVE-2024-28878

Indicators of Compromise

• Unexpected outbound or peer-to-peer connections from the ELD to non-vendor hosts on the adjacent network
• Unsigned or unrecognized binary artifacts written to ELD storage outside of scheduled vendor update windows
• ELD firmware version strings or build hashes that do not match the vendor's published manifest

Detection Strategies

• Monitor in-vehicle and fleet networks for code-delivery traffic patterns targeting telematics devices over Bluetooth, Wi-Fi, or cellular tethers
• Baseline normal update cadence and source endpoints for ELD devices, then alert on deviations
• Correlate ELD process behavior changes with recent network exposure events on the same vehicle segment

Monitoring Recommendations

• Forward fleet management system logs and ELD update telemetry to a centralized analytics platform for review
• Track firmware versions across the fleet and flag devices running unverified or out-of-band builds
• Review the CISA ICS Advisory ICSA-24-093-01 for vendor-specific indicators and recommended sensor placement

How to Mitigate CVE-2024-28878

Immediate Actions Required

• Contact the device vendor to confirm whether updated firmware addressing CVE-2024-28878 is available and apply it across the fleet
• Restrict adjacent-network access to the ELD by disabling unused wireless interfaces and pairing only with trusted devices
• Segment the in-vehicle network so the ELD cannot reach or be reached by untrusted endpoints

Patch Information

Refer to the CISA ICS Advisory ICSA-24-093-01 for vendor remediation guidance. At the time of NVD publication, mitigation depends on vendor-issued firmware that enforces cryptographic verification of downloaded code. Operators should validate that any update introduces signed firmware packages and a secure boot chain.

Workarounds

• Limit physical and wireless access to vehicles containing the IO-1020 Micro ELD until a verified patch is installed
• Disable optional wireless features such as Bluetooth pairing modes that broaden the adjacent attack surface
• Require driver and technician authentication before any diagnostic or update session with the device

# Example: restrict Bluetooth pairing scope on a paired companion device
# (operator-side workaround, not a device patch)
bluetoothctl discoverable off
bluetoothctl pairable off
bluetoothctl remove <unknown-mac-address>