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ⓘ
MICROSOFT “BLUEBLEED” DATA BREACH: CUSTOMER DETAILS AND EMAIL CONTENT EXPOSED
Graham Cluley • @gcluley
12:35 pm, October 20, 2022
Microsoft has admitted that it accidentally exposed sensitive customer data
after failing to configure a server securely.
Cybersecurity firm SOCRadar informed Microsoft about the embarrassing leak in
September, which researchers claimed involved files dated from 2017 to August
2022.
The following business transaction data has been exposed:
* names
* email addresses
* email content
* company name
* phone numbers
In addition, Microsoft warned that the exposed data may include “attached files
relating to business between a customer and Microsoft or an authorized Microsoft
partner.”
SOCRadar claims that the sensitive data of over 65,000 entities in 111 countries
on a misconfigured Microsoft server that had been left accessible over the
internet.
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SOCRadar, which has dubbed the data breach “BlueBleed”, has created a website
where concerned companies can search to see if their data has been exposed.
Microsoft has not shared any details about the size of the data breach, and
while thanking SOCRadar for raising the alarm about the data leak, it has
claimed that the researchers had “greatly exaggerated the scope of this issue”:
> Our in-depth investigation and analysis of the data set shows duplicate
> information, with multiple references to the same emails, projects, and users.
> We take this issue very seriously and are disappointed that SOCRadar
> exaggerated the numbers involved in this issue even after we highlighted their
> error.
The public release of SOCRadar’s BlueBleed search tool seems to have
particularly upset Microsoft, saying that it is “not in the best interest of
ensuring customer privacy or security and potentially exposing them to
unnecessary risk.”
Microsoft argues that any security firm releasing such a tool should put in
place basic measures such as verifying users before allowing them to search for
data related to their domain.
Microsoft should be rightly embarrassed by its sloppy security, which has
needlessly exposed the data of its customers. I suspect that most Microsoft
customers will be less bothered with the quibbling over just how much data was
carelessly exposed, and more worried that the security cock-up happened in the
first place.
According to SOCRadar, Microsoft responded within hours of being notified of the
problem, reconfiguring its Azure Blob Storage cloud bucket to properly secure it
from unauthorised access.
It’s obviously a positive thing that the misconfigured server has been secured,
but it is unfortunately the case that this particular horse has already bolted –
for there are reports that Microsoft’s leaky bucket has been “publicly indexed
for months”.
Found this article interesting? Follow Graham Cluley on Twitter to read more of
the exclusive content we post.
--------------------------------------------------------------------------------
* Data loss
* Microsoft
* #Azure
* #BlueBleed
* #data breach
* #Microsoft
Graham Cluley • @gcluley
Graham Cluley is a veteran of the anti-virus industry having worked for a number
of security companies since the early 1990s when he wrote the first ever version
of Dr Solomon's Anti-Virus Toolkit for Windows. Now an independent security
analyst, he regularly makes media appearances and is an international public
speaker on the topic of computer security, hackers, and online privacy. Follow
him on Twitter at @gcluley, or drop him an email.
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