CVE-2024-38813

What it actually does

This vulnerability allows a network-reachable attacker to trigger a flaw in VMware vCenter Server using a specially crafted network packet and elevate privileges to root on the vCenter appliance. Because root is the highest operating-system privilege level on vCenter Server, successful exploitation can give the attacker control over the underlying appliance, access to sensitive configuration and credentials, and the ability to tamper with vCenter services, logs, and managed virtual infrastructure. The vulnerability is rated critical with CVSS 9.8, is listed in CISA KEV, and is reported as actively exploited in the wild.

Why it matters to the business

Compromise of vCenter can have enterprise-wide consequences because vCenter is commonly the control plane for large VMware environments. An attacker with root-level access could disrupt virtual machine management, alter permissions, steal credentials, interfere with backups or snapshots, deploy malicious workloads, or create conditions for broader ransomware or destructive activity. Since this issue is in CISA KEV with a remediation deadline of 2024-12-11 and has active in-the-wild exploitation, exposed or unpatched vCenter instances should be treated as high-priority operational risk even if no ransomware use is currently reported.

How an attack unfolds

An attacker first identifies a reachable VMware vCenter Server over the network, typically through exposed management interfaces or access from a compromised internal network segment. The attacker sends a specially crafted network packet to the vulnerable service path. If the target is running a vulnerable version, the flaw can be triggered to escalate privileges on the vCenter appliance to root. After gaining root-level privileges, the attacker may establish persistence, inspect vCenter configuration, access stored secrets or tokens, manipulate services, create or modify administrator permissions, deploy or alter virtual machines, and remove or tamper with logs to hide activity. Because exploitation has been observed in the wild, defenders should assume opportunistic scanning and targeted exploitation are both plausible.

How to fix it

Apply the Broadcom/VMware vendor fixes for CVE-2024-38813 immediately, following the relevant vCenter Server and VMware Cloud Foundation guidance in the official advisory. If exact package versions are managed internally, verify that each deployed vCenter Server build is at or above the vendor-fixed release for its major branch. If immediate patching is not possible, restrict network access to vCenter management interfaces to trusted administrative networks only, block internet exposure, enforce VPN or bastion access, monitor for abnormal vCenter service behavior, and disable unnecessary access paths. Because this is a privilege-escalation issue with active exploitation, mitigation should not be considered equivalent to patching. After remediation, review local root access, SSH configuration, vCenter SSO users, roles, permissions, service modifications, scheduled tasks, and logs for signs of prior compromise.

How to confirm the fix worked

Confirm remediation by checking the installed vCenter Server version and build against the fixed versions in the official Broadcom/VMware security advisory. Validate from both the appliance management interface and command-line version output where available. Run authenticated vulnerability scanning or configuration assessment to confirm the CVE is no longer reported. Verify that vCenter management ports are not exposed to untrusted networks and that only approved administrative networks can reach them. Review appliance logs after patching to ensure vCenter services restart cleanly and no unexpected root login, service crash, or configuration-change events persist.

Typical attack path

1. Discover a VMware vCenter Server instance through internet scanning, internal reconnaissance, VPN access, or a compromised host with network reachability.
2. Confirm the target is a potentially vulnerable vCenter Server version or build.
3. Send a specially crafted network packet to the vulnerable vCenter service.
4. Trigger privilege escalation and obtain root-level execution or control on the vCenter appliance.
5. Collect configuration data, credentials, tokens, certificates, and inventory information from vCenter.
6. Create persistence through local accounts, SSH keys, scheduled tasks, service changes, or vCenter permission changes.
7. Use vCenter control to manipulate virtual machines, snapshots, hosts, datastores, or administrative roles.
8. Attempt lateral movement, data theft, service disruption, or preparation for follow-on extortion activity.
9. Clear or modify logs and disable monitoring to reduce forensic visibility.

How to detect it

To determine whether exploitation already occurred, review vCenter appliance logs, operating-system audit logs, authentication logs, and centralized SIEM telemetry for the period before patching through remediation. Prioritize /var/log/vmware/ service logs, /var/log/audit/audit.log, /var/log/auth.log or equivalent authentication records, /var/log/messages, shell history, cron/systemd locations, and vCenter event/task logs. Look for unexpected root logins, new SSH keys, unexplained shell execution, abnormal vCenter service crashes or restarts, segmentation faults, core dumps, unexplained changes to SSO users or administrator roles, sudden creation or modification of local accounts, and log gaps. Network telemetry may show suspicious connections to vCenter management services shortly before service instability or root-level activity, but a reliable public packet signature is not generally derivable from the vulnerability description alone. If the appliance was vulnerable and exposed, absence of a known IOC should not be treated as proof of non-compromise.

• /var/log/vmware/vpxd/vpxd.log
• /var/log/vmware/rhttpproxy/rhttpproxy.log
• /var/log/vmware/envoy/envoy-access.log
• /var/log/vmware/vmon/vmon.log
• /var/log/audit/audit.log
• /var/log/auth.log
• /var/log/messages
• /etc/passwd
• /etc/shadow
• /root/.ssh/authorized_keys
• /var/spool/cron/root
• /etc/cron.d/
• /etc/systemd/system/
• Accepted password for root
• Accepted publickey for root
• session opened for user root
• COMMAND=/bin/bash
• COMMAND=/bin/sh
• segfault
• core dumped
• vpxd crashed
• service-control --stop
• service-control --start

What your security team should do

• Patch all affected VMware vCenter Server instances immediately; prioritize internet-facing or broadly reachable management planes first.
• Treat this as urgent because it is CISA KEV-listed, actively exploited in the wild, and has a 2024-12-11 federal remediation deadline.
• Restrict vCenter access to dedicated management networks, VPNs, or bastion hosts; block direct internet exposure.
• Perform threat hunting on all vulnerable or recently patched vCenter appliances for signs of root-level access, service crashes, new accounts, permission changes, and log tampering.
• Review vCenter SSO users, groups, roles, permissions, API tokens, certificates, SSH keys, and local appliance accounts for unauthorized changes.
• Rotate credentials and secrets that may be accessible from vCenter if compromise is suspected.
• Ensure vCenter logs are forwarded to a centralized SIEM or log platform so local log tampering does not erase evidence.
• Create detections for unexpected root SSH logins, shell execution by vCenter services, service restarts or crashes, and changes to cron, systemd, or local account files.
• Validate backup and recovery procedures for vCenter and critical virtual infrastructure in case of destructive follow-on activity.
• Monitor vendor advisories and threat intelligence for exploit details, updated fixed builds, and newly observed indicators.