Broadcom VMware vCenter Server – DCERPC Out-of-Bounds Write Vulnerability
Vulnerability Overview
- CVE ID: CVE-2024-37079
- Affected Product: VMware vCenter Server
- Vulnerability Class: Out-of-Bounds Write
- CWE: CWE-787
- Attack Vector: Network
- Authentication: Not Required
- Privileges Required: None
- User Interaction: None
- Impact: Remote Code Execution
- CVSS v3.x Score: Estimated 9.8
- Severity: Critical
- Exploit Maturity: Weaponizable
- Known Exploitation: Not publicly confirmed
- Ransomware Use: Unknown but high likelihood
Technical Description
CVE-2024-37079 is a memory corruption vulnerability in VMware vCenter Server related to the handling of DCERPC protocol requests. The flaw exists due to insufficient validation of RPC message boundaries, offsets, and length fields when processing incoming network traffic.
When vCenter parses malformed DCERPC packets, it may write attacker-controlled data outside the allocated memory buffer. This out-of-bounds write can corrupt adjacent memory regions, including function pointers and control structures used by the service.
Because vCenter services run with elevated privileges, successful exploitation can result in full compromise of the vCenter appliance, enabling arbitrary code execution at a high privilege level.
Why This Vulnerability Is High Risk
vCenter Server acts as the centralized management layer for VMware environments. Compromise of vCenter often means:
- Full control over ESXi hosts
- Ability to power off, delete, or encrypt virtual machines
- Access to VM disk files and snapshots
- Credential harvesting from memory
- Lateral movement into Active Directory and backup systems
This makes vCenter an extremely attractive target for advanced threat actors and ransomware groups.
Exploitation Details
Exploitation Preconditions
- Network-level access to vCenter Server
- DCERPC service reachable internally or externally
- Vulnerable, unpatched vCenter version
Exploitation Process
- Attacker identifies an exposed or reachable vCenter Server.
- Specially crafted DCERPC packets are sent to the vulnerable service endpoint.
- Packet fields manipulate length and offset values beyond expected bounds.
- vCenter writes data outside the allocated buffer.
- Memory corruption occurs, allowing execution flow manipulation.
- Attacker executes arbitrary code within the vCenter context.
Exploitation Complexity
- No authentication required
- No user interaction required
- Exploitable over the network
- High reliability once exploit is developed
Why This CVE Was Added to the CISA KEV Catalog
CVE-2024-37079 meets multiple criteria used by CISA for Known Exploited Vulnerabilities designation, even if public exploitation has not yet been confirmed:
- Critical CVSS Score
The vulnerability allows unauthenticated remote code execution with maximum impact. - Infrastructure-Level Target
vCenter is core enterprise infrastructure, not an endpoint product. - High-Value Post-Exploitation Impact
Exploitation enables mass ransomware deployment, data destruction, and business disruption. - Low Barrier to Weaponization
Memory corruption flaws in RPC implementations are well understood by threat actors. - Historical Precedent
Previous vCenter and hypervisor vulnerabilities have been actively exploited by ransomware groups.
Because of these factors, the risk of real-world exploitation is considered imminent enough to warrant mandatory remediation timelines.
MITRE ATT&CK Mapping
Initial Access
- T1190 – Exploit Public-Facing Application
Execution
- T1106 – Native API
- T1059 – Command and Scripting Interpreter
Privilege Escalation
- T1068 – Exploitation for Privilege Escalation
Lateral Movement
- T1021 – Remote Services
Impact
- T1486 – Data Encrypted for Impact
- T1490 – Inhibit System Recovery
Detection Strategy Overview
This vulnerability does not produce a single clean indicator. Detection relies on behavioral anomalies, protocol abuse, and post-exploitation signals.
Primary Detection Focus Areas
- Abnormal DCERPC traffic
- vCenter service instability
- Unexpected child processes
- Memory corruption indicators
- Network-based exploit attempts
SIEM-Ready Detection Rules
1. Network-Based Detection (IDS / NDR)
Objective: Identify malformed or suspicious DCERPC traffic.
Detection Logic:
- DCERPC packets with abnormal size fields
- Repeated malformed RPC bind or request attempts
- High-volume RPC requests from a single source
Example Rule Logic:
IF protocol = DCERPC
AND packet_length > expected_max
OR rpc_structure_invalid = true
THEN alert "Suspicious DCERPC Activity Targeting vCenter"
2. vCenter Service Crash Detection
Objective: Identify exploitation attempts causing memory corruption.
Log Source: vpxd.log, syslog
Detection Logic:
- Segmentation faults
- Core dumps
- Unexpected service restarts
Example Rule Logic:
IF log_source = vcenter
AND message CONTAINS ("segfault" OR "core dumped" OR "memory corruption")
THEN alert "Potential vCenter Exploitation Attempt"
3. Process Anomaly Detection
Objective: Detect post-exploitation activity.
Log Source: vCenter OS process logs, EDR telemetry
Detection Logic:
- vCenter services spawning shells
- Unexpected binaries executed by vpxd or related services
Example Rule Logic:
IF parent_process IN ("vpxd","vmware-vapi")
AND child_process IN ("bash","sh","python","curl","wget")
THEN alert "Suspicious Command Execution from vCenter Service"
4. File System Integrity Monitoring
Objective: Detect payload deployment.
Detection Logic:
- Unauthorized file writes in system directories
- Creation of executable files by vCenter services
Example Rule Logic:
IF process = vcenter_service
AND file_path IN ("/bin","/usr/bin","/tmp")
AND file_type = executable
THEN alert "Suspicious File Creation by vCenter"
5. Outbound Network Behavior
Objective: Detect command-and-control activity.
Detection Logic:
- vCenter initiating outbound connections
- Unusual destinations or protocols
Example Rule Logic:
IF source = vcenter_server
AND destination NOT IN approved_management_networks
THEN alert "Unexpected Outbound Connection from vCenter"
Log Sources Required for Effective Detection
- vCenter Server logs (vpxd.log)
- VMware API logs
- Linux syslog from vCenter appliance
- Network firewall logs
- IDS / IPS telemetry
- EDR telemetry (if available)
Payload Behavior
Although no public exploit payload is available, realistic payload behavior would include:
- In-memory shellcode execution
- Reverse shell establishment
- Download of secondary tools
- Credential harvesting
- Ransomware deployment scripts
Payloads are likely to be memory-resident initially to evade disk-based detection.
Remediation and Mitigation
Primary Remediation
Apply the official VMware/Broadcom patch addressing CVE-2024-37079.
Official Patch Link:
(Insert official Broadcom VMware advisory or patch download page here)
Compensating Controls
- Restrict network access to vCenter
- Block DCERPC traffic where not explicitly required
- Isolate vCenter from user networks
- Enable aggressive monitoring
- Follow BOD 22-01 timelines and requirements
Business Risk Summary
- Operational Impact: Severe
- Ransomware Risk: High
- Data Loss Risk: High
- Recovery Complexity: High
- Enterprise Blast Radius: Maximum
Final Takeaway
CVE-2024-37079 represents a critical threat to virtualization infrastructure. Even without confirmed public exploitation, the vulnerability’s characteristics strongly align with those used in real-world ransomware and targeted attacks.
Immediate remediation and continuous monitoring are strongly advised.
