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Home Alerts

Azure API Flaw Enables Privilege Escalation

September 16, 2024
Reading Time: 2 mins read
in Alerts
Azure API Flaw Enables Privilege Escalation

In September 2024, a significant vulnerability was discovered in Azure API Management (APIM), which allowed users with Reader-level access to escalate their privileges to Contributor-level. This critical flaw, identified by Binary Security researchers, posed a severe security risk as it enabled unauthorized users to read, modify, and delete APIM configurations via the Direct Management API. The issue was traced back to a flaw in the Azure Resource Manager (ARM) API, which inadvertently bypassed restrictions designed to protect sensitive information from Reader-level users.

The vulnerability could be exploited by attackers who had Reader access to call a specific ARM API endpoint. This endpoint allowed them to obtain keys for the default admin user, which could then be used to generate SharedAccessSignatures. With these signatures, attackers gained full management access to the APIM resource, enabling them to perform operations that were not intended for Reader-level users. This access included the ability to list subscription keys, identity provider keys, and named value secrets, potentially exposing further integrated systems and sensitive data.

Microsoft responded swiftly to the discovery, addressing the vulnerability within a month of being notified. The company implemented restrictions on the affected ARM API to prevent Reader-level users from accessing critical information. Additionally, a retroactive fix was applied to all instances of APIM to ensure that no systems remained vulnerable. This prompt action by Microsoft highlights the importance of a responsive and effective approach to addressing security flaws.

The incident underscores the need for robust defense-in-depth strategies to protect critical Azure resources. Experts recommend making critical resources private and only accessible from specific virtual networks (VNETs) or CI/CD environments, depending on deployment scenarios. As new vulnerabilities in Azure and other cloud services continue to emerge, organizations must remain vigilant and proactively implement security best practices to mitigate potential risks and safeguard their digital assets.

Reference:
  • Critical Azure API Management Vulnerability Allows Privilege Escalation
Tags: APIMAzureAzure API ManagementCyber AlertsCyber Alerts 2024Cyber threatsSeptember 2024Vulnerability
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