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Showing posts with label Microsoft Office. Show all posts

Microsoft Office 365 Exposing User’s IP Address in Emails





Microsoft Office 365's webmail interface has been accused for exposing the user's IP address injected into the message as an extra mail header.

This news comes as a rather major warning to those who resorted to Office 365 webmail interface to hide their IP address, because in reality they are not concealing anything.

The service injects an extra mail header into the email called x-originating-IP that contains the IP address of the connecting client, which for this situation is the user's local IP address and this all happens when an email is sent via Office 365 (https://outlook.office365.com/).

BleepingComputer even came around to test the webmail interfaces for Gmail, Yippee, AOL, Outlook.com (https://outlook.live.com), and Office 365.

As for Microsoft, it has removed the x-originating-IP header field in 2013 from Hotmail to offer their users much better security and privacy.

"Please be informed that Microsoft has opted to mask the X-Originating IP address. This is a planned change on the part of Microsoft in order to secure the well-being and safety of our customers."

However for Office 365, who 'caters to the enterprise', this header was deliberately left in so that admins could scan for email that has been sent to their respective organization from a specific IP address. This was particularly helpful for finding the location of a sender in the event of an account getting hacked.

And for Office 365 admins who don't wish to keep utilizing this header, they are allowed to make another new rule in the Exchange admin center that easily removes the header.



In any case, for security and auditing purposes, it is most likely a more shrewd decision to keep it enabled.

Multi-factor authentication bypassed to hack Office 365 & G Suite Cloud accounts



Massive IMAP-based password-spraying attacks successfully breached Microsoft Office 365 and G Suite accounts, circumventing multi-factor authentication (MFA) according to an analysis by Proofpoint.

As noted by Proofpoint's Information Protection Research Team in a recent report, during a "recent six-month study of major cloud service tenants, Proofpoint researchers observed attackers are targeting legacy protocols with stolen credential dumps to increase the speed and efficiency of the brute force attacks.

Based on Proofpoint study, IMAP is the most abused protocol, IMAP is the protocol that bypasses MFA and lock-out options for failed logins.

This technique takes advantage of the fact that the legacy authentication IMAP protocol bypasses MFA, allowing malicious actors to perform credential stuffing attacks against assets that would have been otherwise protected.

These intelligent new brute force attacks bring a new approach to the traditional normal brute force attack that uses the combination of usernames and passwords.

Based on the Proofpoint analysis of over one hundred thousand unauthorized logins across millions of monitored cloud user-accounts and found that:

▬ 72% of tenants were targeted at least once by threat actors
▬ 40% of tenants had at least one compromised account in their environment
▬ Over 2% of active user-accounts were targeted by malicious actors
▬ 15 out of every 10,000 active user-accounts were successfully breached by attackers

Their analysis unearthed the fact that around 60% of all Microsoft Office 365 and G Suite tenants have been targeted using IMAP-based password-spraying attacks and, as a direct result, approximately 25% of G Suite and Office 365 tenants that were attacked also experienced a successful breach.

On the whole, after crunching down the numbers, Proofpoint reached the conclusion that threat actors managed to reach a surprising 44% success rate when it came to breaching accounts at targeted organizations.

The ultimate aim of the attackers is to launch internal phishing and to have a strong foothold within the organization. Internal phishing attempts are hard to detect when compared to the external ones.

Adobe Patched Zero-Day Vulnerability




Adobe has recently issued a security update for Flash Player in order to fix a zero-day vulnerability that was exploited by attackers in the wild.

The Flash Player vulnerability (CVE-2018-5002), a stack-based buffer over-flow bug that could empower discretionary code execution, was taken care of on the seventh of June.

The weakness was found and independently made public to a few security firms significantly including the ICEBRG, Tencent, and two security divisions from Chinese digital security mammoth Qihoo 360. Tracked as CVE-2018-5002, it effectively impacts Adobe Flash Player 29.0.0.171 and its earlier versions although it was reported to be settled with the timely release of Flash Player 30.0.0.113.

 “It allows for a maliciously crafted Flash object to execute code on victim computers, which enables an attacker to execute a range of payloads and actions,” said the researchers from ICEBRG's Security Research Team, who were the first to report the discovered vulnerability.

The exploit utilizes a cautiously developed Microsoft Office report to download and execute an Adobe Flash exploit to the victims' PC, as per ICEBRG analysts. The documents were sent basically through email, as per Adobe.

Both ICEBRG and Qihoo 360 discovered evidence that proposed that the exploit was focusing on Qatari victims, in light of the geopolitical interests.

“The weaponized document … is an Arabic language themed document that purports to inform the target of employee salary adjustments,” ICEBRG researchers said. “Most of the job titles included in the document is diplomatic in nature, specifically referring to salaries with positions referencing secretaries, ambassadors, diplomats, etc.”

As indicated by Will Dormann of CERT/CC, other than fixing the actual imperfection, Adobe likewise included an extra dialog window that inquires the users as to whether they want to stack remote SWF records inside Office documents or not. The incite relief additionally comes to settle an issue with Office applications, where Flash content is in some cases downloaded consequently, without provoking the user ahead of time.