Home windows directors from quite a few organizations report widespread account lockouts triggered by false positives within the rollout of a brand new Microsoft Entra ID’s “leaked credentials” detection app referred to as MACE.
These alerts and lockouts started final night time, with some admins believing they had been false positives because the accounts have distinctive passwords that aren’t used on another websites or purposes.
Microsoft Entra ID, previously Azure Lively Listing, is a cloud-based identification and entry administration service that helps organizations handle consumer identities and safe entry to assets.
In a Reddit thread posted early this morning, Home windows admins reported receiving a number of alerts from Entra indicating that a few of their consumer accounts had been discovered with credentials leaked on the darkish internet or different areas.
These accounts had been mechanically locked out of the tenant, with quite a few customers impacted per group.
“Us as effectively… about 1/third of our accounts bought locked out about ~1 hour in the past. We’re a MSP so I am assuming that is occurring to our shoppers as effectively,” posted an admin on Reddit.
The locked-out accounts confirmed no indicators of compromise, comparable to suspicious sign-ins, and had been protected with MFA. Moreover, breach notification companies like Have I Been Pwned (HIBP) had no matches for these accounts.​
One other report on Reddit additional corroborated that this was widespread, with an MDR supplier stating they obtained over 20,000 notifications from Microsoft in a single day concerning leaked credentials from completely different clientsÂ
Whereas Microsoft has not publicly confirmed the reason for these lockouts, Microsoft advised one of many affected organizations it was brought on by a problem with the rollout of a brand new Enterprise software referred to as “MACE Credential Revocation.”
“Simply bought off with engineer. It’s Tenant Lockout because of this MACE ninja rollout they did. no indicators of compromise. He wants an hour to transform the ticket from compromise to lockout however can breathe a sigh of reduction. It was Error Code: 53003 for conditional entry coverage,” an admin reported on Reddit.
A number of individuals confirmed this software was added to tenants proper earlier than they started receiving the alerts.
MACE Credential Revocation app is a Microsoft Entra function used to detect leaked credentials and lockout probably compromised accounts.
Whereas all alerts of leaked credentials ought to be investigated to verify that an account was not compromised, in the event you obtained a flurry of alerts directly this rollout seemingly brought on it.
BleepingComputer contacted Microsoft with questions on this incident however has not obtained a response at the moment.
