CVE-2025-29972: Azure Storage Resource Provider SSRF

CVE-2025-29972 Overview

CVE-2025-29972 is a critical Server-Side Request Forgery (SSRF) vulnerability in Microsoft Azure Storage Resource Provider that allows an authorized attacker to perform spoofing over a network. This vulnerability enables attackers to manipulate server-side requests, potentially accessing internal resources, bypassing security controls, and exfiltrating sensitive data from Azure cloud infrastructure.

Critical Impact

This SSRF vulnerability in Azure Storage Resource Provider could allow attackers to forge requests from the server, potentially accessing internal Azure services, metadata endpoints, and other protected resources that should not be externally accessible.

Affected Products

• Microsoft Azure Storage Resource Provider

Discovery Timeline

• 2025-05-08 - CVE-2025-29972 published to NVD
• 2026-02-13 - Last updated in NVD database

Technical Details for CVE-2025-29972

Vulnerability Analysis

This Server-Side Request Forgery (SSRF) vulnerability (CWE-918) exists within the Microsoft Azure Storage Resource Provider, a core component responsible for managing Azure storage account operations. SSRF vulnerabilities occur when an application can be manipulated to make requests to unintended locations, effectively using the vulnerable server as a proxy to access internal or external resources.

In cloud environments like Azure, SSRF vulnerabilities are particularly dangerous because they can be leveraged to access cloud metadata services, internal APIs, and other protected endpoints. An authorized attacker exploiting this vulnerability could potentially access sensitive configuration data, credentials stored in metadata services, or communicate with internal Azure infrastructure components that are normally isolated from external access.

The network-accessible nature of this vulnerability means it can be exploited remotely without user interaction, making it a high-priority concern for organizations using Azure Storage services.

Root Cause

The root cause of CVE-2025-29972 is improper validation or sanitization of user-controlled input that is subsequently used in server-side HTTP requests. The Azure Storage Resource Provider fails to adequately restrict the destinations of outbound requests, allowing attackers to craft malicious requests that cause the server to make connections to arbitrary internal or external endpoints. This lack of proper URL validation and request filtering enables the SSRF attack vector.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no user interaction. An authorized attacker with access to the Azure Storage Resource Provider can craft malicious requests containing manipulated URLs or endpoint references. When the server processes these requests, it follows the attacker-controlled destinations, potentially exposing internal resources such as:

• Cloud instance metadata endpoints (e.g., 169.254.169.254)
• Internal Azure management APIs
• Private network services and databases
• Other storage accounts or resources within the Azure infrastructure

The attacker can use this capability to enumerate internal network topology, extract credentials from metadata services, or pivot to attack other internal systems.

Detection Methods for CVE-2025-29972

Indicators of Compromise

• Unusual outbound requests from Azure Storage Resource Provider to internal IP ranges (e.g., 169.254.x.x, 10.x.x.x, 172.16.x.x)
• Requests to cloud metadata endpoints originating from storage resource management operations
• Unexpected network traffic patterns from Azure storage management components to non-standard destinations
• Authentication anomalies or credential access attempts following storage API interactions

Detection Strategies

• Monitor Azure Activity Logs and Azure Monitor for unusual storage resource provider operations
• Implement network traffic analysis to detect requests to internal IP addresses from Azure management plane components
• Configure Azure Sentinel or similar SIEM solutions to alert on suspicious storage management API call patterns
• Review Azure Storage diagnostic logs for anomalous request patterns or destinations

Monitoring Recommendations

• Enable enhanced logging for Azure Storage Resource Provider operations in Azure Monitor
• Set up alerts for requests targeting metadata endpoints (169.254.169.254) from storage-related services
• Implement network segmentation monitoring to detect lateral movement attempts
• Regularly audit Azure resource access patterns and API usage for anomalous behavior

How to Mitigate CVE-2025-29972

Immediate Actions Required

• Review the Microsoft Security Response Center advisory for CVE-2025-29972 for specific guidance
• Apply any available patches or updates from Microsoft for Azure Storage Resource Provider
• Audit recent Azure Storage Resource Provider activity for signs of exploitation
• Implement network-level controls to restrict outbound traffic from Azure management components

Patch Information

Microsoft has released guidance for this vulnerability through the Microsoft Security Response Center. Organizations should consult the official Microsoft CVE-2025-29972 Advisory for specific patch information and remediation steps. As this is an Azure cloud service vulnerability, Microsoft may apply patches automatically to the cloud infrastructure, but customers should verify their deployment status and follow any additional Microsoft guidance.

Workarounds

• Implement strict network egress controls using Azure Network Security Groups to limit outbound destinations from storage management components
• Use Azure Private Link where possible to minimize exposure of storage management endpoints
• Enable Azure Defender for Storage to gain additional threat detection capabilities
• Limit authorized user access to Azure Storage Resource Provider operations using Azure RBAC with the principle of least privilege
• Monitor and restrict access to cloud metadata endpoints using Azure Firewall or third-party network security solutions