VMware vCenter Server DCERPC Protocol Heap Overflow Remote Code Execution Vulnerability (CVE-2024-38812) Critical Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTVMware vCenter Server versions 7.0 and 8.0, VMware Cloud Foundation versions 4.x and 5.x
An unauthenticated remote attacker can trigger a heap overflow via specially crafted DCERPC packets, potentially executing arbitrary code with root privileges
Immediately apply the official Broadcom security patches (vCenter 8.0 U3b / 7.0 U3s or later) and restrict network access to vCenter management ports
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Broadcom has released official patches to address this vulnerability. Administrators should upgrade vCenter Server to version 8.0 U3b or 7.0 U3s immediately. Use the following VCSA CLI commands to apply the patch:
# Log in to the vCenter Appliance Shell and install the patch via ISO
software-packages install --iso --acceptEulas
# Alternatively, install directly from the online VMware repository
software-packages install --url --acceptEulas
# Verify the service status and the updated version
service-control --status
cat /etc/vmware/version2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, restrict access to the vCenter Server management interface and DCERPC ports (such as TCP 135) using network firewalls or local iptables rules on Photon OS:
# Allow DCERPC (TCP 135) only from a trusted management subnet (e.g., 192.168.10.0/24)
iptables -A INPUT -p tcp -s 192.168.10.0/24 --dport 135 -j ACCEPT
iptables -A INPUT -p tcp --dport 135 -j DROP
# Save the iptables configuration on Photon OS
/sbin/iptables-save > /etc/systemd/scripts/ip4save3. Log Audit & IoC Verification Commands
Run the following commands on the vCenter Server Appliance to inspect for potential exploitation attempts or service crashes:
# Check for service crashes and core dumps in the system logs
ls -la /var/core/
grep -Ei 'segfault|general protection|core dumped' /var/log/messages
# Audit the vmdir logs for anomalous connection errors or packet failures
grep -Ei 'fail|error|invalid packet' /var/log/vmware/vmdir/vmdird-syslog.logStop Exposing VPN Ports to the Internet — Switch to Zero-Trust Access
Eliminate public-facing VPN concentrators and firewall management ports with identity-first Zero-Trust Network Access.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2024-38812) is a critical heap-based buffer overflow (CWE-122) residing in the Distributed Computing Environment / Remote Procedure Call (DCERPC) protocol implementation of VMware vCenter Server. The root cause lies in the lack of proper boundary validation when parsing incoming DCERPC network packets. By sending a packet with mismatched or malformed size parameters, an attacker can corrupt adjacent heap memory blocks, leading to memory corruption and arbitrary code execution.
2. Exploitation Mechanics & Attack Scenario
An attacker with network access to the vCenter Server can exploit this vulnerability without any prior authentication or user interaction. The attack vector involves sending crafted DCERPC bind or fragmentation requests to the target service. This triggers the heap overflow, allowing the attacker to overwrite critical memory structures, such as function pointers. Consequently, the attacker can hijack the execution flow and execute arbitrary system commands under the context of the highly privileged 'root' user on the underlying Photon OS.
3. Infrastructure & Business Impact
Since vCenter Server acts as the centralized management plane for entire virtualized environments (including ESXi hosts, virtual machines, and storage), compromise of this server grants the attacker full control over the virtual infrastructure. This vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation in the wild. Successful exploitation can lead to complete data exfiltration, infrastructure-wide ransomware deployment, and catastrophic business disruption.
Official Vendor Advisories & References
The vCenter Server contains a heap-overflow vulnerability in the implementation of the DCERPC protocol. A malicious actor with network access to vCenter Server may trigger this vulnerability by sending a specially crafted network packet potentially leading to remote code execution.
Frequently Asked SecOps Questions (CVE-2024-38812)
FAQQ1. How critical is CVE-2024-38812 and is it actively exploited in the wild?
CVE-2024-38812 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 54.6%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2024-38812?
Primary impacted vendors include vmware, broadcom across vcenter_server, cloud_foundation. Scope summary: VMware vCenter Server 8.0 (prior to 8.0 U3b), vCenter Server 7.0 (prior to 7.0 U3s), and VMware Cloud Foundation 5.x/4.x
Q3. What temporary mitigations or workarounds exist for CVE-2024-38812 before patching?
[Mitigation] Immediately apply the official Broadcom security patches (vCenter 8.0 U3b / 7.0 U3s or later) and restrict network access to vCenter management ports Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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