CVE-2022-22982: VMware Cloud Foundation SSRF Vulnerability

CVE-2022-22982 Overview

CVE-2022-22982 is a Server-Side Request Forgery (SSRF) vulnerability affecting VMware vCenter Server. This vulnerability allows a malicious actor with network access to port 443 on the vCenter Server to exploit the issue by accessing URL requests outside of vCenter Server or accessing internal services. SSRF vulnerabilities in centralized management platforms like vCenter Server are particularly dangerous as they can serve as a pivot point for attackers to probe internal network resources and services that would otherwise be inaccessible from external networks.

Critical Impact

Attackers with network access to vCenter Server port 443 can leverage this SSRF vulnerability to access internal services and external URLs, potentially enabling reconnaissance of internal network infrastructure and unauthorized access to sensitive resources.

Affected Products

• VMware vCenter Server 6.5 (all updates through 6.5 Update 3s)
• VMware vCenter Server 6.7 (all updates through 6.7 Update 3q)
• VMware vCenter Server 7.0 (all updates through 7.0 Update 3e)
• VMware Cloud Foundation (multiple versions)

Discovery Timeline

• July 13, 2022 - CVE-2022-22982 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-22982

Vulnerability Analysis

This Server-Side Request Forgery (SSRF) vulnerability in VMware vCenter Server (classified under CWE-918) allows attackers to manipulate the server into making HTTP requests to arbitrary destinations. The vulnerability exists in the vCenter Server's handling of URL requests, where insufficient validation allows an attacker to craft requests that the server will execute on behalf of the attacker.

The attack requires network access to port 443, which is the standard HTTPS management port for vCenter Server. Once exploited, the attacker can force the vCenter Server to make requests to internal services that may not be directly accessible from the attacker's network position, effectively using vCenter as a proxy into the internal network. This can lead to significant information disclosure as the attacker can probe internal network topology, identify running services, and potentially access sensitive data from internal endpoints.

Root Cause

The root cause of this vulnerability lies in improper input validation of user-controlled URL parameters within the vCenter Server application. The server fails to adequately restrict the destinations of server-side HTTP requests, allowing attackers to specify arbitrary URLs that the server will then access. This lack of proper URL validation and allowlisting enables the SSRF attack vector.

Attack Vector

The attack is conducted over the network, targeting the vCenter Server's HTTPS interface on port 443. An attacker does not require authentication to exploit this vulnerability, making it accessible to any network-adjacent threat actor. The exploitation process involves:

1. Identifying a vCenter Server instance exposed on port 443
2. Crafting a malicious request containing a URL parameter pointing to an internal service or external destination
3. Sending the crafted request to the vulnerable vCenter Server endpoint
4. The server processes the request and makes an HTTP request to the attacker-specified destination
5. The attacker observes the response or side effects to extract information

The vulnerability can be used to access internal services such as metadata endpoints, internal web applications, or to perform port scanning of the internal network. It can also be leveraged to make requests to external URLs, potentially useful for exfiltrating data or establishing communication channels.

Detection Methods for CVE-2022-22982

Indicators of Compromise

• Unusual outbound HTTP/HTTPS requests from vCenter Server to internal IP addresses or unexpected external destinations
• Log entries showing vCenter Server accessing internal metadata services or non-standard endpoints
• Network traffic patterns indicating port scanning activity originating from the vCenter Server
• Unexpected responses or errors in vCenter logs related to URL fetching operations

Detection Strategies

• Monitor vCenter Server logs for anomalous URL access patterns, particularly requests to internal IP ranges (10.x.x.x, 172.16.x.x-172.31.x.x, 192.168.x.x) or cloud metadata endpoints (169.254.169.254)
• Implement network monitoring rules to detect unusual outbound connections from vCenter Server to internal services it should not typically access
• Deploy SentinelOne Singularity to detect and alert on suspicious network behavior patterns associated with SSRF exploitation
• Review firewall and proxy logs for unexpected traffic flows originating from the vCenter Server

Monitoring Recommendations

• Enable detailed logging on vCenter Server and forward logs to a SIEM for correlation and analysis
• Configure network segmentation monitoring to detect cross-boundary access attempts from the vCenter Server
• Implement egress filtering and monitoring on the vCenter Server network segment to identify unauthorized outbound requests
• Use SentinelOne's network visibility features to track and alert on anomalous vCenter Server network activity

How to Mitigate CVE-2022-22982

Immediate Actions Required

• Apply the security patches provided by VMware as detailed in the VMware Security Advisory VMSA-2022-0018
• Restrict network access to vCenter Server port 443 to only authorized management workstations and systems
• Implement network segmentation to limit the internal resources accessible from the vCenter Server network segment
• Review and audit current vCenter Server access logs for any signs of exploitation

Patch Information

VMware has released security patches addressing this vulnerability. Administrators should consult the VMware Security Advisory VMSA-2022-0018 for specific patch versions and upgrade paths. The affected versions include vCenter Server 6.5, 6.7, and 7.0 series, as well as VMware Cloud Foundation deployments that include vCenter Server.

Organizations should prioritize patching based on the exposure of their vCenter Server instances. Internet-facing or DMZ-adjacent vCenter deployments should be treated with highest priority.

Workarounds

• Implement strict firewall rules to limit outbound connections from vCenter Server to only necessary destinations
• Deploy a web application firewall (WAF) in front of vCenter Server to filter potentially malicious requests
• Use network segmentation to isolate vCenter Server from sensitive internal services that could be targeted via SSRF
• Consider implementing proxy-based egress controls to monitor and restrict server-initiated HTTP requests

# Example firewall rule to restrict vCenter outbound access (iptables)
# Restrict outbound HTTP/HTTPS from vCenter to only approved destinations
iptables -A OUTPUT -p tcp --dport 80 -m owner --uid-owner vcenter -j DROP
iptables -A OUTPUT -p tcp --dport 443 -m owner --uid-owner vcenter -j DROP
# Allow specific approved destinations
iptables -I OUTPUT -p tcp --dport 443 -d trusted.update.server.com -j ACCEPT