Security News > 2024 > June > Azure Service Tags tagged as security risk, Microsoft disagrees

Security researchers at Tenable discovered what they describe as a high-severity vulnerability in Azure Service Tag that could allow attackers to access customers' private data.

Service Tags are groups of IP addresses for a specific Azure service used for firewall filtering and IP-based Access Control Lists when network isolation is needed to safeguard Azure resources.

Tenable's Liv Matan explained that threat actors can use the vulnerability to craft malicious SSRF-like web requests to impersonate trusted Azure services and bypass firewall rules based on Azure Service Tags, often used to secure Azure services and sensitive data without authentication checks.

Matan has shared more technical information in his report on abusing custom headers and Azure Service Tags to access internal APIs that are not normally exposed.

Microsoft disagrees with Tenable's assessment that this is an Azure vulnerability, saying that Azure Service Tags were not meant as a security boundary, even though that was not clear in their original documentation.

The company says additional authorization and authentication checks are required for a layered network security approach to protect customers' Azure service endpoints from unauthorized access attempts.

News URL

https://www.bleepingcomputer.com/news/microsoft/azure-service-tags-tagged-as-security-risk-microsoft-disagrees/