overview

CVE-2025-33072 is a high-severity information disclosure vulnerability in Microsoft Azure resulting from improper access control on a web service endpoint. This flaw enables unauthorized attackers to access sensitive information over a network, even without authentication credentials.

Description

A misconfiguration in Microsoft Azure's msagsfeedback web service endpoint allows requests to bypass standard access controls, exposing internal or privileged information intended to remain confidential. The flaw stems from insufficient validation of incoming network requests, enabling data disclosure to anyone with network access to the affected endpoint.

Potential Impact

Attackers can retrieve internal telemetry, error logs, partial configuration data, or user-submitted feedback that may aid further attacks, reconnaissance, or compliance violations. The exposure of such information could also facilitate social engineering, lateral movement, or more sophisticated exploitation of Azure infrastructure.

Exploitation Method

Exploitation is relatively straightforward. Attackers only require network connectivity and knowledge of the vulnerable endpoint (msagsfeedback.azurewebsites.net) to issue API or HTTP requests and access information—no authentication or credential compromise is necessary.

Affected Products and Versions

  • Impacted Platform: Microsoft Azure
  • Vulnerable Component: Azure-hosted web service at msagsfeedback.azurewebsites.net
  • Affected Versions: Cloud service endpoints configured without sufficient access control (precise Azure service SKUs or modules are not enumerated in current advisories)
  • Patched/Mitigated Versions: No specific patched version is listed in public disclosures as of this writing. Microsoft is expected to issue service-side remediations via the Security Response Center. Users should monitor the MSRC and Azure Service Health for official patch or mitigation guidance

Current Threat Status

  • Exploited in the Wild: There are no confirmed reports of active exploitation in the wild as of the latest updates. However, researchers emphasize the ease of exploitation, raising concerns about rapid adoption in reconnaissance or opportunistic attacks.
  • Attack Techniques/Observed Incidents: The vulnerability enables unauthenticated network-based information disclosure. Typical attack scenarios involve probing the feedback endpoint for sensitive data leakage without valid credentials. No advanced techniques are necessary; exploitation is primarily through direct network requests.
  • Targeted Industries/Sectors: No industry- or sector-specific targeting has been observed. Since the flaw exists within core Azure infrastructure, any organization relying on this endpoint for feedback or telemetry, regardless of industry, could be at risk if their configurations are vulnerable.

 

 

INDICATORS OF COMPROMISE (IOCS)

Current Status

At this time, there are no confirmed Indicators of Compromise (IOCs) publicly available for CVE-2025-33072. Official sources, including the National Vulnerability Database and MITRE, have not published any specific technical artifacts—such as IP addresses, domains, file hashes, or malware signatures—linked to exploitation of this vulnerability.

Ongoing Investigation

Security researchers and vendors are actively monitoring for exploitation activity related to CVE-2025-33072. Efforts are ongoing to identify any IOCs that may emerge as public exploitation or security research provides additional information. Organizations are encouraged to regularly check authoritative sources such as:

  • NIST National Vulnerability Database (NVD)
  • MITRE CVE database
  • Microsoft Security Update Guide
  • Official Azure Security advisories

Guidance for Organizations

  • Review relevant security advisories and updates from Microsoft and trusted threat intelligence feeds.
  • Apply the latest security patches and follow best practices for cloud access control and auditing.
  • Monitor official vulnerability databases regularly for IOC updates.

Avertium remains vigilant and committed to locating and disclosing IOCs for CVE-2025-33072 for our customers. Should any be located, Avertium will disclose them as soon as possible.

 

 

MITRE ATT&CK ttPS

With a CVSS rating of 8.1, this represents a high-severity vulnerability with a moderate probability of exploitation. The following MITRE ATT&CK tactics, techniques, and procedures are associated with CVE-2025-33072:

Initial Access

  • T1190 - Exploit Public-Facing Application: Attackers could exploit this vulnerability in public-facing Azure services to gain initial access to sensitive information without authentication.

Discovery

  • T1082 - System Information Discovery: The improper access control allows attackers to gather system information about the Azure environment that should be restricted.
  • T1083 - File and Directory Discovery: Attackers can potentially discover files and directory structures that would normally be protected in the Azure environment.

Collection

  • T1119 - Automated Collection: After exploiting the access control vulnerability, attackers may use automated tools to collect exposed information from Azure repositories.
  • T1213 - Data from Information Repositories: The vulnerability specifically allows information disclosure from Azure information repositories that would otherwise be protected.

Exfiltration

  • T1048 - Exfiltration Over Alternative Protocol: Attackers can leverage the information disclosure vulnerability to exfiltrate the collected data over network protocols.
  • T1567 - Exfiltration Over Web Service: Since Azure is cloud-based, attackers may use web services to exfiltrate the sensitive information obtained through the vulnerability.

Defense Evasion

  • T1550 - Use Alternate Authentication Material: The vulnerability allows bypassing normal authentication mechanisms, enabling attackers to access information without proper credentials.

Credential Access

  • T1552 - Unsecured Credentials: The information disclosure may expose configuration files, tokens, or other credentials stored in the Azure environment.

Impact

  • T1565 - Data Manipulation: While primarily an information disclosure vulnerability, attackers might use the exposed information to subsequently manipulate data in the Azure environment.

 

 

additional Recommendations + information

Immediate Mitigation Measures

  1. Restrict Access to the Vulnerable Endpoint
  • Block external access to the msagsfeedback.azurewebsites.net endpoint at your network perimeter
  • Implement IP allowlisting for critical Azure resources to only permit necessary connections - Configure Azure Network Security Groups (NSGs) to restrict traffic to vulnerable services
  1. Review Azure Access Controls
  • Audit all Azure services for proper authentication implementation - Verify that all web endpoints require proper authentication tokens
  • Remove any publicly accessible endpoints that aren't absolutely necessary
  1. Implement Azure Private Link
  • Configure Azure Private Link to ensure Azure resources are only accessible through private networks
  • Disable public network access to affected resources where possible

Patch and System Monitoring

  1. Apply Microsoft's Security Updates
  • Monitor Microsoft Security Response Center (MSRC) for patches addressing CVE-2025-33072
  • Deploy the security update as soon as it becomes available (released on May 8, 2025)
  • Prioritize patching internet-facing Azure resources first
  1. Enhance Detection and Monitoring
  • Configure Azure Security Center to detect potential exploitation attempts - Enable advanced threat protection features in Azure Defender
  • Implement logging and monitoring for all access attempts to affected endpoints
  • Create alerts for unusual data access patterns or unexpected outbound data transfers
  1. Vulnerability Scanning
  • Conduct regular vulnerability scans of Azure resources to identify similar misconfigurations
  • Use tools that can detect improper access control issues in cloud environments
  • Perform penetration testing to validate that mitigations are effective

Network Security Enhancements

  1. Implement Advanced Perimeter Controls
  • Deploy a Web Application Firewall (WAF) in front of Azure web services - Configure Azure Front Door with security policies to filter malicious traffic
  • Implement Azure DDoS Protection to prevent denial-of-service attacks that might be used alongside exploitation attempts
  1. Network Traffic Monitoring
  • Implement network traffic analysis to detect unusual patterns of data exfiltration
  • Set up alerts for unexpected outbound connections from affected Azure services
  • Use Azure Network Watcher to monitor suspicious network traffic patterns
  1. Endpoint Isolation
  • Segment Azure resources using Virtual Networks (VNets)
  • Implement proper subnet isolation for sensitive services
  • Use Service Endpoints to restrict access to Azure services from specific VNets only
Additional Security Measures
  1. Zero Trust Implementation
  • Adopt a Zero Trust security model for all Azure resources
  • Implement least privilege access principles across your Azure environment
  • Require multi-factor authentication for all administrative access
  1. Incident Response Planning
  • Update incident response plans to include procedures for handling information disclosure incidents
  • Prepare communication templates for potential data breach notifications
  • Conduct tabletop exercises to practice response to this specific vulnerability
  1. Security Assessment
  • Conduct a comprehensive security assessment of your Azure environment
  • Review all web service endpoints for similar access control issues
  • Evaluate the potential impact of information disclosure on your organization

 

 

ADDITIONAL SERVICE OFFERINGS


Threat Detection & Response (TDR)

Avertium's Threat Detection & Response (TDR) integrates all aspects of security operations into an XDR-informed detection and response system, providing proactive monitoring and rapid incident response. For vulnerabilities like CVE-2025-33072, TDR ensures continuous surveillance, prioritization of threats, and rapid mitigation to limit potential damage if unauthorized access is detected. TDR also integrates and optimizes SIEM platforms to ensure that any unusual or unauthorized access attempts are quickly identified and acted upon.

Microsoft Security Solutions

Avertium specializes in optimizing security across Microsoft Azure environments. Their services include analyzing existing configurations to identify and close improper access control gaps, deploying custom threat detection rules for Azure, and simplifying endpoint and identity management through Microsoft Entra ID and Intune. These measures help prevent information disclosure by ensuring that only authorized users have access to sensitive resources, aligning directly with the mitigation needs for CVE-2025-33072.

Security Information and Event Management (SIEM)

By leveraging SIEM integration and optimization, Avertium provides holistic visibility across Azure and hybrid infrastructures. SIEM detects and analyzes unusual activity related to improper access controls, such as suspicious privilege escalations or unauthorized data access, enabling security teams to respond before information disclosure occurs.

Cybersecurity Strategy Alignment

Avertium aligns cybersecurity strategy with business objectives, ensuring security investments directly address modern threats such as those affecting Azure. This includes:

  • Strategic Security Assessments: Evaluating the effectiveness of current Azure configurations and identifying areas susceptible to improper access control.
  • Threat Mapping: Using threat intelligence and frameworks like MITRE ATT&CK to map vulnerability exploitation paths and implement targeted defenses.
  • Cyber Maturity Roadmap: Ongoing improvement of access controls, policy development, and user awareness training to minimize the risk of information disclosure due to misconfigurations.

Governance, Risk, and Compliance (GRC)

Avertium's GRC services ensure compliance with key regulatory frameworks (such as NIST, HIPAA, GDPR) and help organizations maintain proper access controls and documentation in Azure. This minimizes compliance risks and provides structured guidance to remediate vulnerabilities like CVE-2025-33072, focusing on least privilege, auditing, and secure configuration management.


 

 

SUPPORTING DOCUMENTATION

https://windowsforum.com/threads/cve-2025-33072-critical-azure-feedback-endpoint-vulnerability-security-lessons.365410/

https://nvd.nist.gov/vuln/detail/CVE-2025-33072

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-33072

https://learn.microsoft.com/en-us/azure/aks/security-bulletins/overview

https://cyble.com/blog/cve-2025-21415-microsoft-critical-security-risks/






 
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