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Technology • Top Stories

Viewing GIF In Microsoft Teams Can Lead To Account Hijack

April 27, 2020
2 Min Read
Viewing GIF In Microsoft Teams Can Lead To Account Hijack
Amber Lewis
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Microsoft has resolved safety issues in Microsoft Teams that would have been utilized in an assault chain to take over person accounts — all with the assistance of a .GIF file.  On Monday, cybersecurity researchers from CyberArk said a subdomain takeover vulnerability, mixed with a malicious.GIF file, may very well be used to “scrape a consumer’s information and, in the end, take over a company’s total roster of Teams accounts.’

The staff says the safety points affect Microsoft Teams on the desktop in addition to the net browser model. Microsoft’s communications platform is having fun with an expanded buyer base alongside rival companies similar to Zoom and GoToMeeting as a result of the COVID-19 outbreak. Microsoft Teams is being employed in retaining companies operational, which incorporates the sharing of company knowledge, and will, subsequently, be of renewed curiosity to cyber attackers in light of the present circumstances.

Throughout CyberArk’s examination of the platform, the staff discovered that each time the appliance was opened, the Groups consumer creates a brand new short-term entry token, authenticated through login.microsoftonline.com. Different tokens are additionally generated to entry supported providers corresponding to SharePoint and Outlook.

Two cookies are used to limit content material entry permissions, “authtoken” and “skypetoken_asm.” The Skype token was despatched to groups.microsoft.com and its subdomains — two of which have been discovered to be weak to a subdomain takeover.

Nevertheless, the assault chain is advanced, because it was essential for an attacker to situation a certificate for the compromised subdomains, solely doable by ‘proving’ possession by assessments reminiscent of importing a file to a particular path.

Because the subdomains have been already susceptible, this problem was overcome — and by sending both a malicious link to the subdomain or by sending a crew a .GIF file, this might result in the technology of the required token to compromise a sufferer’s Teams session by a newly-authenticated attacker. Because the picture solely needed to be seen, this might impression multiple particular people at a time.

TagsAccount Hijack cybersecurity Microsoft Microsoft Teams

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