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 systems and stems from a heap-based buffer overflow [CWE-122] in the protocol handler. An attacker on an adjacent network segment can trigger memory corruption when a user interacts with a crafted request. Successful exploitation grants the attacker code execution with the privileges of the affected service.
Critical Impact
Adjacent-network attackers can execute arbitrary code on unpatched Windows Server 2008 hosts, compromising confidentiality, integrity, and availability.
Affected Products
- Microsoft Windows Server 2008 SP2 (x64)
- Microsoft Windows Server 2008 SP2 (x86)
- Microsoft Windows Server 2008 R2 SP1 (x64)
Discovery Timeline
- 2024-06-11 - CVE-2024-30074 published to the National Vulnerability Database
- 2024-06-11 - Microsoft published security update guidance for CVE-2024-30074
- 2026-07-20 - Last updated in NVD database
Technical Details for CVE-2024-30074
Vulnerability Analysis
The Link Layer Topology Discovery protocol enables Windows hosts to discover and map devices on a local network segment. The vulnerable code path processes LLTD frames received on the local link and writes attacker-controlled data into a heap buffer without adequate bounds enforcement. Microsoft categorizes the issue as a remote code execution flaw, and NVD maps it to CWE-122 (Heap-based Buffer Overflow). Exploitation results in arbitrary code execution in the context of the LLTD service. The vulnerability requires user interaction, so an attacker typically pairs the network payload with a social engineering trigger to complete the exploit chain.
Root Cause
The root cause is improper validation of length or size fields inside an LLTD protocol message before copying data into a fixed-size heap allocation. When the parser processes an oversized or malformed field, it writes past the allocation boundary and corrupts adjacent heap metadata or object pointers. An attacker who controls the overflow contents can steer execution into attacker-supplied code or gadgets.
Attack Vector
The attack vector is Adjacent Network, meaning the attacker must be present on the same broadcast domain or link-layer segment as the target. LLTD traffic uses EtherType 0x88D9 and does not route across Layer 3 boundaries, which constrains exploitation to attackers with local network access such as compromised Wi-Fi clients, malicious VMs on the same virtual switch, or rogue devices on a corporate LAN. User interaction is required on the target, which typically means a user initiates network mapping or accepts an LLTD-related prompt. No authentication is required to send the malicious frame.
No public proof-of-concept exploit is available for CVE-2024-30074. Refer to the Microsoft Security Update Guide entry for CVE-2024-30074 for vendor technical details.
Detection Methods for CVE-2024-30074
Indicators of Compromise
- Unexpected LLTD frames (EtherType 0x88D9) originating from unauthorized hosts on the local network segment.
- Crashes or restarts of the lltdsvc service on Windows Server 2008 hosts, visible in the System event log.
- New or unsigned child processes spawned by services associated with LLTD or network discovery components.
- Unexpected outbound connections initiated by processes hosting network discovery functionality.
Detection Strategies
- Monitor endpoints for anomalous behavior in services related to link-layer discovery, including unexpected memory allocations, thread creation, or module loads.
- Deploy network sensors that inspect Layer 2 traffic for malformed LLTD frames or unusually large TLV fields.
- Correlate Windows Error Reporting (WER) faults in lltdio.sys or lltdsvc.dll with adjacent network telemetry.
Monitoring Recommendations
- Enable Windows event forwarding for System and Application logs from Windows Server 2008 hosts still in service.
- Track EDR telemetry for process injection, unsigned code execution, and unusual token manipulation on the affected systems.
- Audit VLAN and Wi-Fi segments for unauthorized devices capable of injecting LLTD frames.
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 affected Windows Server 2008 and Windows Server 2008 R2 systems.
- Inventory remaining Windows Server 2008 hosts and prioritize replacement or isolation, since the platform is out of mainstream support.
- Restrict physical and logical access to network segments containing legacy Windows Server 2008 systems.
Patch Information
Microsoft published fixes through the Extended Security Update (ESU) program for Windows Server 2008 SP2 and Windows Server 2008 R2 SP1. Download links and KB identifiers are available from the Microsoft Security Update Guide for CVE-2024-30074. Organizations without ESU coverage should treat affected hosts as end-of-life and migrate workloads to supported Windows Server versions.
Workarounds
- Disable the Link Layer Topology Discovery Mapper I/O Driver and Responder on affected adapters through the network adapter properties dialog.
- Block LLTD traffic (EtherType 0x88D9) at managed switches and wireless controllers where the protocol is not required.
- Segment legacy Windows Server 2008 hosts onto isolated VLANs with strict Layer 2 access controls and no untrusted client devices.
- Enforce host-based firewall rules that deny inbound discovery protocol traffic on production servers.
# Disable LLTD components on a Windows adapter via PowerShell
Disable-NetAdapterBinding -Name "Ethernet" -ComponentID ms_lltdio
Disable-NetAdapterBinding -Name "Ethernet" -ComponentID ms_rspndr
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
