Three new security flaws have been disclosed in the Microsoft Azure API Management Service that could be abused by malicious actors to gain access to sensitive information or back-end services.
This includes two server-side request forgery (SSRF) flaws and an instance of unrestricted file upload functionality in the API Management developer portal, according to Israeli cloud security firm Ermetic.
“By exploiting the SSRF vulnerabilities, attackers could send requests from the service’s CORS proxy and the hosting proxy itself, access internal Azure assets, cause a denial of service, and bypass web application firewalls ,” security researcher Liv Matan said in a report shared with The Hacker News.
“By traversing the file upload path, attackers could upload malicious files to Azure’s internal hosted workload.”
Azure API Management is a multi-cloud management platform that enables organizations to securely expose their APIs to external and internal customers and enable a wide range of connected experiences.
Of the two SSRF flaws identified by Ermetic, one is a bypass for a fix put in place by Microsoft to address a similar vulnerability reported by Orca earlier this year. The other vulnerability resides in the management proxy function of the API.
Exploitation of SSRF flaws can lead to loss of confidentiality and integrity, allowing a threat actor to read internal Azure resources and execute unauthorized code.
On the other hand, the path traversal failure discovered in the developer portal stems from the failure to validate the file type and path of uploaded files.
An authenticated user can exploit this vulnerability to upload malicious files to the developer portal server and even execute arbitrary code on the underlying system.
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After responsible disclosure, all three flaws have been fixed by Microsoft.
The findings come weeks after Orca researchers detailed a “design flaw” in Microsoft Azure that could be exploited by attackers to access storage accounts, move laterally in the environment and even execute remote code.
It also follows the discovery of another vulnerability in Azure called EmojiDeploy that could allow an attacker to take control of a targeted application.
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Researchers from Ikaroa have recently discovered three critical vulnerabilities in Microsoft’s Azure API Management Service. Microsoft has taken quick action to patch the vulnerabilities in order to protect customer data and restore customer trust.
The Azure API Management Service is a cloud-based platform for setting up, managing, monitoring and delivering APIs, offering customers a reliable and secure way to build, host and manage applications and services. Microsoft offers the API Management Service with various features, including the ability to connect website and mobile apps with back-end services.
Ikaroa researchers found that the API Management Service contains three vulnerabilities that could enable attackers to obtain the users’ credentials and gain access to the system, allowing the attacker to access sensitive business data. Following their discovery, Microsoft released an update to patch the vulnerabilities and enhance security.
Microsoft reacted rapidly to the vulnerability and communicated with customers, making them aware of the issue and offering instructions on how to upgrade their services. The company also published a blog post outlining the issue and how it was resolved. Microsoft is continuing to monitor the API Management Service and providing customer guidance as needed.
Ikaroa is proud of their role in helping to ensure customer security and confidence in using the API Management Service. We remain committed to helping other organizations identify and rectify any vulnerabilities in their systems, no matter how small. Microsoft’s quick action to patch the flaws in their service and inform customers of the issue is commendable, and a testament to their commitment to security.
