CVE-2024-30074: Windows Server 2008 LLTD RCE Vulnerability

CVE-2024-30074 Overview

CVE-2024-30074 is a remote code execution vulnerability in the Windows Link Layer Topology Discovery (LLTD) Protocol. The flaw affects Microsoft Windows Server 2008 SP2 (x86 and x64) and Windows Server 2008 R2 SP1. An attacker on an adjacent network can trigger heap-based buffer corruption [CWE-122] in the LLTD component to execute arbitrary code. Exploitation requires user interaction, per the CVSS vector. Microsoft published the advisory on June 11, 2024.

Critical Impact
Successful exploitation grants an adjacent-network attacker code execution on the target host, with high impact to confidentiality, integrity, and availability.

Affected Products

Microsoft Windows Server 2008 SP2 (x86)
Microsoft Windows Server 2008 SP2 (x64)
Microsoft Windows Server 2008 R2 SP1 (x64)

Discovery Timeline

2024-06-11 - CVE-2024-30074 published to NVD
2024-06-11 - Microsoft releases security update via MSRC advisory
2026-07-20 - Last updated in NVD database

Technical Details for CVE-2024-30074

Vulnerability Analysis

The vulnerability resides in the Windows implementation of the Link Layer Topology Discovery (LLTD) Protocol, a Microsoft protocol used to map hosts on the local network segment. The weakness is classified as a heap-based buffer overflow [CWE-122]. An attacker who can send crafted LLTD frames on the same broadcast domain as the target can corrupt heap memory in the LLTD handler. When combined with the required user interaction, this corruption allows execution of arbitrary code in the context of the vulnerable process.

The adjacent-network attack vector limits exploitation to attackers with logical access to the same layer-2 network segment. This scope includes attackers on the same VLAN, Wi-Fi network, or attackers who have already established a foothold on a peer host.

Root Cause

The root cause is improper validation of size or length fields inside LLTD protocol messages processed by the Windows LLTD stack. Insufficient bounds checking permits an oversized element to overflow a heap allocation, corrupting adjacent chunk metadata or function pointers. See the Microsoft Security Response Center advisory for vendor details.

Attack Vector

An attacker on the adjacent network crafts malicious LLTD packets and transmits them so the target processes the frames. User interaction is required, which typically means an administrator or user must initiate a network map, discovery action, or similar workflow that invokes the LLTD responder. When the vulnerable code path parses the crafted message, the heap overflow triggers and can be leveraged to hijack execution flow.

No public proof-of-concept exploit is currently listed for CVE-2024-30074, and the CVE is not present on the CISA Known Exploited Vulnerabilities catalog. Full technical details are limited by Microsoft; see the vendor advisory for authoritative information.

Detection Methods for CVE-2024-30074

Indicators of Compromise

Unexpected LLTD (EtherType 0x88D9) traffic on network segments where topology discovery is not in active use.
Malformed LLTD frames with oversized TLV fields or length values inconsistent with the payload size.
Crashes, unexpected restarts, or memory faults in lltdsvc.dll or lltdio.sys on Windows Server 2008 hosts.
Outbound connections from Windows Server 2008 hosts to attacker-controlled infrastructure following LLTD traffic bursts.

Detection Strategies

Deploy network intrusion detection signatures that flag malformed LLTD frames and abnormal LLTD volumes on internal segments.
Monitor Windows Event Log entries for service failures in the LLTD Mapper (lltdsvc) and Responder services on affected Server 2008 systems.
Correlate host telemetry showing new child processes or code execution originating from the LLTD service context.
Baseline normal LLTD activity so anomalous discovery traffic from non-management hosts is immediately visible.

Monitoring Recommendations

Ingest network sensor and endpoint telemetry into a centralized analytics platform to correlate adjacent-network probes with host anomalies.
Alert on any process spawned by the LLTD service or unexpected loading of lltdio.sys on legacy Windows Server 2008 assets.
Track authentication and lateral movement events immediately following LLTD traffic spikes on the same VLAN.

How to Mitigate CVE-2024-30074

Immediate Actions Required

Apply the Microsoft security update referenced in the MSRC advisory for CVE-2024-30074 to all Windows Server 2008 and 2008 R2 systems.
Inventory legacy Windows Server 2008 hosts and prioritize patching or decommissioning, since this product line is beyond mainstream support.
Segment vulnerable hosts onto restricted VLANs to reduce the adjacent-network attack surface.
Instruct administrators to avoid using Network Map or LLTD-triggering workflows until patches are applied.

Patch Information

Microsoft has released security updates addressing CVE-2024-30074 for the affected Windows Server 2008 SP2 (x86 and x64) and Windows Server 2008 R2 SP1 platforms. Refer to the Microsoft Security Response Center update guide for the applicable KB articles and download links.

Workarounds

Disable the Link-Layer Topology Discovery Mapper (lltdsvc) service on hosts that do not require network map functionality.
Uncheck the Link-Layer Topology Discovery Mapper I/O Driver and Responder in the network adapter properties on affected systems.
Enforce host and switch-level filtering to block LLTD EtherType 0x88D9 frames from untrusted sources on the local segment.
Restrict access to management VLANs so only authorized systems share a broadcast domain with Windows Server 2008 hosts.

bash

# Configuration example: disable the LLTD Mapper service on Windows Server 2008
sc.exe config lltdsvc start= disabled
sc.exe stop lltdsvc

# Disable LLTD driver bindings on a network adapter (PowerShell)
Disable-NetAdapterBinding -Name "Local Area Connection" -ComponentID ms_lltdio
Disable-NetAdapterBinding -Name "Local Area Connection" -ComponentID ms_rspndr