CVE-2022-31680: VMware vCenter Server RCE Vulnerability

CVE-2022-31680 Overview

CVE-2022-31680 is an unsafe deserialization vulnerability affecting VMware vCenter Server's Platform Services Controller (PSC). A malicious actor with administrative access to vCenter Server may exploit this issue to execute arbitrary code on the underlying operating system that hosts the vCenter Server. This vulnerability represents a significant threat to enterprise virtualization environments, as vCenter Server is a critical component managing VMware infrastructure.

Critical Impact

Authenticated attackers with admin privileges can achieve arbitrary code execution on the underlying host operating system, potentially leading to complete compromise of the virtualization infrastructure and all managed virtual machines.

Affected Products

• VMware vCenter Server 6.5 (all versions and updates through 6.5 Update 3u)
• VMware vCenter Server 6.7 (versions prior to the security patch)
• VMware vCenter Server 7.0 (versions prior to the security patch)

Discovery Timeline

• 2022-10-07 - CVE-2022-31680 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-31680

Vulnerability Analysis

This vulnerability is classified as CWE-502 (Deserialization of Untrusted Data). The Platform Services Controller (PSC) component within vCenter Server improperly handles serialized data, allowing an authenticated administrator to supply maliciously crafted serialized objects. When these objects are deserialized by the application, they can trigger arbitrary code execution with the privileges of the vCenter Server service.

The attack requires network access and administrative credentials to vCenter Server, meaning the attacker must already have elevated privileges within the target environment. However, once exploited, the vulnerability allows the attacker to break out of the vCenter application context and execute commands directly on the underlying operating system, potentially gaining control over the entire virtualization infrastructure.

Root Cause

The root cause of this vulnerability lies in the unsafe deserialization practices within the Platform Services Controller component. The PSC accepts serialized Java objects without proper validation of the object types being deserialized. This allows an attacker to inject malicious serialized objects that, when processed, instantiate dangerous classes capable of executing arbitrary system commands.

Java deserialization vulnerabilities are particularly dangerous because the deserialization process can trigger side effects in object constructors, finalizers, or magic methods (such as readObject()), allowing attackers to chain multiple gadget classes together to achieve code execution.

Attack Vector

The attack vector for CVE-2022-31680 requires the following conditions:

1. Network Access: The attacker must be able to reach the vCenter Server over the network
2. Administrative Credentials: Valid admin-level credentials for vCenter Server are required
3. Malicious Payload: A crafted serialized object payload targeting the PSC deserialization endpoint

Once these conditions are met, the attacker can submit a malicious serialized object to the vulnerable PSC component. The deserialization process triggers the payload execution, running arbitrary commands on the underlying operating system with the privileges of the vCenter Server process.

The exploitation mechanism involves sending specially crafted serialized Java objects to the Platform Services Controller. When these objects are deserialized, they trigger a chain of method calls that ultimately result in arbitrary command execution. For detailed technical information, refer to the Talos Intelligence Vulnerability Report.

Detection Methods for CVE-2022-31680

Indicators of Compromise

• Unexpected processes spawned by the vCenter Server or PSC services
• Unusual network connections originating from the vCenter Server host
• Suspicious Java serialization traffic patterns in network logs
• Unauthorized modifications to system files on the vCenter Server host

Detection Strategies

• Monitor vCenter Server logs for unusual administrative API calls, particularly those involving serialization endpoints
• Implement network traffic analysis to detect anomalous serialized Java object patterns
• Deploy endpoint detection and response (EDR) solutions on vCenter Server hosts to identify unauthorized process execution
• Review authentication logs for unusual admin login patterns or credential usage

Monitoring Recommendations

• Enable detailed logging for vCenter Server and Platform Services Controller components
• Configure SIEM alerts for process creation events originating from vCenter services
• Monitor for outbound network connections from vCenter Server to unusual destinations
• Implement file integrity monitoring on critical vCenter Server system directories

How to Mitigate CVE-2022-31680

Immediate Actions Required

• Apply the security patches provided by VMware immediately (see VMware Security Advisory VMSA-2022-0025)
• Review and audit administrative accounts with access to vCenter Server
• Implement network segmentation to restrict access to vCenter Server management interfaces
• Enable multi-factor authentication for all vCenter administrative accounts

Patch Information

VMware has released security patches addressing this vulnerability in their advisory VMSA-2022-0025. Administrators should upgrade to the following patched versions:

• vCenter Server 6.5: Update to the latest patched version as specified in the advisory
• vCenter Server 6.7: Update to the latest patched version as specified in the advisory
• vCenter Server 7.0: Update to 7.0 U3h or later

It is critical to apply these patches as soon as possible given the severity of the vulnerability and its potential impact on virtualization infrastructure.

Workarounds

• Restrict network access to vCenter Server management interfaces using firewall rules
• Implement strict access controls limiting administrative privileges to essential personnel only
• Deploy network segmentation to isolate vCenter Server from untrusted network segments
• Monitor administrative sessions and implement session timeout policies

# Example: Restrict vCenter Server access using iptables
# Allow management access only from trusted admin subnet
iptables -A INPUT -p tcp --dport 443 -s 10.0.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Enable additional logging for vCenter connections
iptables -A INPUT -p tcp --dport 443 -j LOG --log-prefix "VCENTER_ACCESS: "