A Vulnerability Allowing Almost Anyone to Send Emails from Uber.com Was Discovered
The Vulnerability Was Apparently Ignored.
Uber Technologies, Inc., or Uber, is a San Francisco-based American mobility-as-a-service provider operating services in over 900 metropolitan regions worldwide. Its services include ride-hailing, food delivery (Uber Eats and Postmates), package delivery, couriers, freight transportation, electric bicycle and motorized scooter rental through a relationship with Lime, and ferry transportation in collaboration with local operators. Uber does not own any vehicles and instead earns a 25% fee on each booking. Fares are quoted to customers in advance, but they change depending on a dynamic pricing methodology based on local supply and demand at the time of booking.
Seif Elsallamy, a security researcher and bug bounty hunter, uncovered a flaw in Uber’s systems that allows anybody to send emails on Uber’s behalf.
The researcher who discovered this flaw warns that threat actors might exploit it to send emails to the 57 million Uber customers and drivers whose information was exposed in a previous data breach.
These emails, sent from Uber’s servers, would appear authentic to an email provider, as they are in fact, and would pass through any spam filters.
Elsallamy forwarded an email that looked like it was from Uber to BleepingComputer.
It’s worth noting that the email arrived in the inbox and prompted the Uber user to supply their credit card details. When you click ‘Confirm,’ the form sends the text fields to a test site that the researcher has set up.
The researcher responsibly submitted the vulnerability to Uber via their HackerOne bug bounty program, however, his report was rejected for being “out-of-scope,” based on the incorrect belief that exploiting the technical defect itself needed some type of social engineering.
Why Is the Vulnerability Concerning?
According to email headers the researcher’s email sent “from Uber” to BleepingComputer passed both DKIM and DMARC security tests.
The researcher’s email was sent using SendGrid, a renowned email marketing, and customer communications platform.
However, Elsallamy informed BleepingComputer that the flaw is caused by an exposed endpoint on Uber’s servers, which allows anybody to create an email on Uber’s behalf.
Hi @Uber @Uber_Support bring your calc and tell me what would be the result if this vulnerability has been used with the 57 million email address that has been leaked from the last data breach?
If you know the result then tell your employees in the bug bounty triage team. pic.twitter.com/f9yKIoCJ6O
— SAFE 😵 (@0x21SAFE) December 31, 2021
How Can Heimdal™ Help?
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