Microsoft Warns of Cross-Account Takeover Bug in Azure Container Instances

Microsoft on Wednesday mentioned it remediated a vulnerability in its Azure Container Situations (ACI) products and services that could have been exploited by a malicious actor “to obtain other customers’ details” in what the researcher explained as the “first cross-account container takeover in the public cloud.”

An attacker exploiting the weakness could execute malicious instructions on other users’ containers, steal purchaser tricks and visuals deployed to the system. The Windows maker did not share any further specifics connected to the flaw, help save that influenced buyers “revoke any privileged credentials that had been deployed to the platform right before August 31, 2021.”

Azure Container Occasions is a managed service that permits end users to run Docker containers right in a serverless cloud surroundings, with no necessitating the use of digital machines, clusters, or orchestrators.

Palo Alto Networks’ Device 42 threat intelligence crew dubbed the vulnerability “Azurescape,” referring to how an attacker can leverage the cross-tenant procedure to escape their rogue ACI container, escalate privileges over a multitenant Kubernetes cluster, and consider manage of impacted containers by executing destructive code.

Breaking out of the container, the researchers mentioned, was created achievable owing to an outdated container runtime made use of in ACI (runC v1..-rc2), therefore making it feasible to exploit CVE-2019-5736 (CVSS rating: 8.6) to escape the container and get code execution with elevated privileges on the fundamental host.

Microsoft said it notified decide on consumers with containers managing on the same Kubernetes cluster as that of the malicious container established by Palo Alto Networks to display the assault. The cluster is reported to have hosted 100 shopper pods and about 120 nodes, with the organization stating it had no proof poor actors had abused the flaw to have out actual-world intrusions, introducing its investigation “surfaced no unauthorized entry to client information.”

The disclosure is the 2nd Azure-connected flaw to come to light-weight in a span of two months, the very first a single currently being a vital Cosmos database flaw that could have been likely exploited to grant any Azure person full admin obtain to other customers’ databases occasions with no any authorization.

“This discovery highlights the will need for cloud people to choose a ‘defense-in-depth’ tactic to securing their cloud infrastructure that consists of continuous checking for threats — inside and outdoors the cloud system,” Device 42 researchers Ariel Zelivanky and Yuval Avrahami stated. “Discovery of Azurescape also underscores the need for cloud provider suppliers to offer satisfactory access for exterior scientists to review their environments, exploring for not known threats.”

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