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Azure Service Material Vulnerability Can Result in Cluster Takeover

By Ionut Arghire on June 29, 2022

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Microsoft has patched a vulnerability that would enable an attacker with entry to an Azure Linux container to escalate privileges and take over your entire cluster.

Tracked as CVE-2022-30137, the vulnerability impacts Service Material, Microsoft’s container orchestrator that gives administration of providers throughout container clusters. Microsoft says Service Material hosts over a million purposes.

The safety challenge is exploitable solely on containers with entry to the Service Material runtime, which means entry to the log listing, in keeping with Palo Alto Networks safety researchers, who recognized and reported the difficulty.

Service Material clusters contemplate hosted purposes to be trusted, thus permitting them to entry the Service Material runtime information by default, which implies that purposes can entry details about their setting and write logs to particular areas, the researchers word.

The safety gap impacts Information Assortment Agent (DCA), a Service Material element that “handles information that might be modified by containers”, thus permitting for container escape and root entry to the node. DCA makes use of the LoadFromFile and SaveToFile features to learn from and write to information, respectively.

“This performance leads to a symlink race. An attacker in a compromised container might place malicious content material within the file that LoadFromFile reads. Whereas it continues to parse the file, the attacker might overwrite the file with a symlink to a fascinating path in order that later SaveToFile will observe the symlink and write the malicious content material to that path,” Palo Alto Networks explains.

In keeping with Microsoft, an attacker capable of execute code inside a container that has entry to the Service Material runtime would additionally want learn/write entry to the cluster to efficiently exploit the vulnerability. The vulnerability exists in each Linux and Home windows clusters, however can solely be exploited on Linux.

On Could 26, Microsoft launched a repair for the bug in Service Material runtime and delivered it to all Azure clients with computerized updates enabled. On June 14, Microsoft printed an advisory on the vulnerability and introduced the patches for patrons with computerized updates. All Azure clients are suggested to use the accessible safety updates as quickly as potential.

“Azure Service Material crew is releasing a patch to additional strengthen the safety within the Linux cluster by adapting the precept of path to least privilege,” Microsoft mentioned in its advisory.

Associated: Microsoft Dismisses False Reviews About Finish of Patch Tuesday

Associated: Patch Tuesday: Microsoft Warns of New Zero-Day Being Exploited

Associated: Microsoft Azure Vulnerability Allowed Code Execution, Information Theft

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