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Geraint Williams, CISO of IT service management company GRCI told Computer Business Review via email: “With tools like Teams, it is so important to ensure that only approved and regulated users can access the platform and post in collaboration activities – it all boils down to having robust user access controls and strong authentication processes in place.  =  Will Government National Data Strategy Deliver on Eliminating Data Silos? However, this scenario should be understood as an actual threat facing not only Microsoft Teams but all applications that maintain the same modus operandi. A set of pre-deployed tasks can be executed by criminals to take advantage of this initial foothold. CyberArk has published a blog post containing a technical description of the attack and a video showing the attack. In recent years, he has invested in the field of information security, exploring and analyzing a wide range of topics, such as pentesting (Kali Linux), malware, hacking, cybersecurity, IoT and security in computer networks. A Microsoft spokesperson commented by email that: “We addressed the issue discussed in this blog and worked with the researcher under Coordinated Vulnerability Disclosure. Below, the initial payload is presented. Learn more at “We addressed the issue discussed in this blog and worked with the researcher under Coordinated Vulnerability Disclosure. “This extends to any other individuals you are collaborating with on Teams who are from outside of your organisation.”, He added: “Even if you have a trusted relationship with that individual, you need to be as confident in their security controls as you are your own – otherwise, this kind of attack could be leveraged through a sub-domain of a trusted partner. Is Your Ransomware Incident Response Plan Future-Proof? Your favorite posts saved to your browsers cookies. Now the Skype token can be created and all the victim’s Team’s account data can be accessed. The use of online videoconference platforms such as Zoom and Microsoft Teams has exploded in recent months, due in large part to the COVID-19 pandemic situation. Figure 1 below demonstrates how this attack can be executed against a large company. Microsoft has addressed a vulnerability that could have been exploited by hackers to hijack Microsoft Teams accounts by sending specially crafted links … This article provides a detailed step-by-step guide on how to hack Microsoft Teams with a simple GIF image. While we have not seen any use of this technique in the wild, we have taken steps to keep our customers safe,” a Microsoft spokesperson told SecurityWeek. display: none !important; However, the cybersecurity firm told, CyberArk has published a blog post containing a, Facebook Awards $55,000 for Flaw That Could Lead to Account Hijacking, Slack Vulnerability Allowed Hackers to Hijack Accounts, U.S. Charges Russian Intelligence Officers for NotPetya, Industroyer Attacks, Google Targeted in Record-Breaking 2.5 Tbps DDoS Attack in 2017, TikTok Launches Public Bug Bounty Program, Juniper Networks Patches Tens of Vulnerabilities, Early Stage Investment in Cybersecurity Shows Signs of Stabilization, Android, macOS Versions of GravityRAT Spyware Spotted in Ongoing Campaign, Scammers Seize on US Election, But It's Not Votes They Want, CISA Warns of Remote Code Execution Bugs in Visual Studio, Windows Codecs Library, Google Says No Significant Election Influence Campaigns Targeting Its Users, French Court Tries Russian for Multi-Million-Euro Cyberfraud, UK Data Privacy Watchdog Slashes BA Fine as Virus Bites, Dickey's Barbecue Pit Investigating Possible Breach Affecting 3M Payment Cards. two Avoiding DR and High Availability Pitfalls in the Hybrid Cloud, A Central Bank Digital Currency? A: It's Coming, OKAY? Hacker could “ultimately take over an organization’s entire roster of Teams accounts”.  −  While we have not seen any use of this technique in the wild, we have taken steps to keep our customers safe.”. The disclosed flaw is a worm-like vulnerability that allows criminals to take over an organization’s entire roster of Teams accounts just by sending victims a malicious link to an innocent-looking GIF image. After getting this privileged token, it can be abused to interact with other internal systems of the Microsoft ecosystem. However, there are certain prerequisites for the attack to work. Microsoft Teams is a collection of enterprise collaboration tools, comprising Office 365, a SharePoint Online site and a document library to store team files so a compromise of an account could have significant consequences. Tech’s Big Beasts Team Up in Bid to Defend the Open Source Oasis: Will It Be More than Hot Air? Squirrel Exploit Leaves Microsoft Teams Vulnerable to Privilege Escalation, Top tips for CISOs and CIOs: How to Fight a Ransomware Attack, “Confidence in Chaos”? Even if a criminal doesn’t have sensitive information from a Team’s account, the flaw can be used to perform a spread attack over the organization’s accounts just like a worm, getting the account’s tokens and then accessing all the chat sessions of the target users. Interested in another course? What are Command Injection Vulnerabilities? CyberArk note in its report that: “The fact that the victim only needs to see the crafted message to be impacted is a nightmare from a security perspective. Microsoft Teams is a communication and collaboration platform that includes chat, video conferencing, file storage, and application integration capabilities. The usage of endpoint security solutions such as antivirus on host-IDS agents should be taken in account as a way of preventing the success of the emergent threats and tricks used by criminals. Beware of the GIF: Account Takeover Vulnerability in Microsoft Teams, Como comprometer o Microsoft Teams apenas com uma imagem GIF. 5) Train any time, on any device. Ten Technologies for ‘Grey Zone’ Conflicts, Europe Sharpens IT Incident Reporting Requirements, Puts Cloud SLAs Under Microscope, Tech Must Work Across Borders to Help Aviation: Virgin Atlantic CIO, How the UK Train Network is Going Digital, Serverless Exists In The Cloud and Both Need Servers. He is also a founding member and Pentester at CSIRT.UBI and Figure 3: JWT token exfiltrated by using this vulnerability. Details including confidential information, meetings and calendar information, competitive data, secrets, passwords, private information, business strategy, plans and procedures can be now used to perform other kinds of attack vectors. Microsoft’s collaboration platform Teams has a vulnerability that allows any user to insert malicious code into the application; gifting control while escalating privileges. From here, unauthorized accesses via remote services such as VPN and email can give the possibility of an internal access. The bug, disclosed to Microsoft on March 23, was discovered and reported by US-based account security firm CyberArk, and quietly patched by Redmond a month later, on April 20, the security company said today. However, this scenario should be understood as an actual threat facing not only Microsoft Teams but all applications that maintain the same modus operandi. CyberArk first found two subdomains that – due to misconfigured DNS records – were open to takeover. CyberArk has admitted that finding a suitable domain is not an easy task, but it believes that an attacker with the right method and the right resources will likely find more subdomains. We are living in an era where technology is part of our lives and a primary valuable resource for personal and professional tasks. An attacker can exploit this weakness to create a link or GIF file that, when processed by Teams, sends an authentication token to a server they control. NVIDIA Closes Israel's Second Largest Ever Tech Buyout. The entire attack can be automated, allowing malicious actors to spread through an organization like a worm by using compromised accounts to send the malicious GIF to other Teams users. You will not be spammed. 3) Hands-on cyber ranges Outsmart cybercrime with 400+ skill development and certification courses. In detail, when the application is opened (both mobile and desktop), a JSON Web Token (JWT) — the access token — is created during that process. First of all, when the victim sees the malicious GIF in Teams, their access token can only be sent to a subdomain of, so the attacker somehow needs to hijack such a subdomain. InfoSec institute respects your privacy and will never use your personal information for anything other than to notify you of your requested course pricing. “We addressed the issue discussed in this blog and worked with the researcher under Coordinated Vulnerability Disclosure. Figure 1: Microsoft Teams attack workflow. The GIF could also be sent to groups (a.k.a Teams), which makes it even easier for an attacker to get control over users faster and with fewer steps.”. At this point, the criminal impersonates the victim and spreads the GIF image with the payload in the organization’s Teams accounts like a worm, infecting a large group of employees. Using this vulnerability, attackers can use a malicious GIF to scrape user’s data and use the data to take over an organization’s entire Teams accounts. The hacker can also use calendar data to learn about meetings between executives, and impersonate one of the parties in an effort to trick the other party into installing a piece of malware by requesting the use of a different app for the meeting. However, the cybersecurity firm told SecurityWeek that it believes the attack still works if someone is able to find Teams subdomains that can be hijacked. While we have not seen any use of this technique in the wild, we have taken steps to keep our customers safe,” a Microsoft spokesperson told. Security firm CyberArk found this subdomain takeover issue in Teams. The vulnerability published in April-mid 2020 could be exploited by a remote agent, and Microsoft promptly patched the flaw a few days after the disclosure. Infosec Skills keeps your security skills fresh year-round with over 400 courses mapped to the National Initiative for Cybersecurity Education’s CyberSeek model. Microsoft’s collaboration platform Teams contained a vulnerability that allowed hackers to send out a GIF that only had to been seen, in order for it to send a valuable access token back to a compromised server.

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