CVE-2020-16904 : Exploit Details and Defense Strategies

An elevation of privilege vulnerability in Azure Functions allows unauthenticated attackers to invoke HTTP Functions without proper authorization.

Understanding CVE-2020-16904

This CVE involves a security flaw in Azure Functions that could lead to unauthorized invocation of HTTP Functions.

What is CVE-2020-16904?

An elevation of privilege vulnerability exists in the way Azure Functions validate access keys. Attackers can exploit this to invoke HTTP Functions without proper authorization.

The Impact of CVE-2020-16904

This vulnerability could result in unauthorized access to HTTP Functions, potentially leading to misuse or data breaches.

Technical Details of CVE-2020-16904

Azure Functions Elevation of Privilege Vulnerability

Vulnerability Description

The vulnerability arises from improper validation of access keys used to access HTTP Functions in Azure Functions.

Affected Systems and Versions

Vendor: Microsoft
Product: Azure Functions
Platforms: Unknown
Versions Affected: N/A

Exploitation Mechanism

Attackers exploit the vulnerability by bypassing access key validation, allowing them to invoke HTTP Functions without proper authorization.

Mitigation and Prevention

Steps to Address CVE-2020-16904

Immediate Steps to Take

Apply the security update provided by Microsoft to correctly validate access keys for HTTP Functions.
Monitor access to Azure Functions for any unauthorized activity.

Long-Term Security Practices

Regularly review and update access control mechanisms for Azure Functions.
Implement multi-factor authentication and least privilege access policies.

Patching and Updates

Stay informed about security updates from Microsoft for Azure Functions.
Promptly apply patches and updates to mitigate security risks.