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Microsoft Patches Azure Cross-Tenant Knowledge Entry Flaw

By Ryan Naraine on December 23, 2022

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Microsoft has silently mounted an important-severity safety flaw in its Azure Container Service (ACS) after an exterior researcher warned {that a} buggy characteristic allowed cross-tenant community bypass assaults.

The vulnerability, documented by researchers at Mnemonic, successfully eliminated the complete community and identification perimeter round  internet-isolated Azure Cognitive Search situations and allowed cross-tenant entry to the info aircraft of ACS situations from any location, together with situations with none express community publicity.

In accordance with Mnemonic researcher Emilien Socchi, the flaw was silently mounted by Microsoft on the finish of August, 2022, roughly six months after it was first reported.

The publicity, nicknamed ACSESSED, impacted all Azure Container Service situations that enabled the “Permit entry from portal” characteristic.

“By enabling that characteristic, clients successfully allowed cross-tenant entry to the info aircraft of their ACS situations from any location, whatever the precise community configurations of the latter. Observe that this included situations uncovered completely on non-public endpoints, in addition to situations with none express community publicity, such because the one I deployed for investigation (i.e. situations with none non-public, service or public endpoint),” the researcher warned.

“By the straightforward click on of a button, clients had been capable of activate a weak characteristic, which eliminated the complete community perimeter configured round their ACS situations, with out offering any actual identification perimeter (i.e. anyone may generate a legitimate entry token for ARM),” Socchi added.

The Mnemonic researcher stated Microsoft paid a $10,000 bounty and elevated the chance degree from average to vital due to the cross-tenant danger and ease of exploitation.

At one level through the disclosure course of, Microsoft stated the patch was delayed as a result of the repair required “a major design degree change.”

Associated: Assaults Focusing on Azure OMIGOD Vulnerability Ramping Up

Associated: For Microsoft, Safety is a $10 Billion Enterprise 

Associated: Microsoft Confirms ‘NotLegit’ Azure Flaw Uncovered Supply Code

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