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A vulnerability in Uber’s e-mail system permits nearly anybody to ship emails on behalf of Uber.
The researcher who found this flaw warns this vulnerability may be abused by menace actors to e-mail 57 million Uber customers and drivers whose info was leaked within the 2016 information breach.
Uber appears to pay attention to the flaw however has not fastened it for now.
‘Your Uber is arriving now’
Safety researcher and bug bounty hunter Seif Elsallamy found a flaw in Uber’s techniques that allows anybody to ship emails on behalf of Uber.
These emails, despatched from Uber’s servers, would seem professional to an e-mail supplier (as a result of technically they’re) and make it previous any spam filters.
Think about getting a message from Uber stating, ‘Your Uber is arriving now,’ or ‘Your Thursday morning journey with Uber’—whenever you by no means made these journeys.
In an indication, Elsallamy despatched me the next e-mail message that, definitely, appeared to have come from Uber and landed proper in my inbox, not junk:
PoC e-mail despatched to BleepingComputer from Uber’s servers
The e-mail type despatched to BleepingComputer by the researcher urges the Uber buyer to supply their bank card info.
On clicking ‘Verify,’ the shape submits the textual content fields to a check website arrange by the researcher.
Word, nevertheless, the message did have a transparent disclaimer in direction of the underside stating, “this can be a safety vulnerability Proof of Idea,” and was despatched to BleepingComputer with prior permission.
PoC disclaimer within the e-mail despatched to BleepingComputer from Uber
On New Yr’s Eve of 2021, the researcher responsibly reported the vulnerability to Uber through their HackerOne bug bounty program.
Nonetheless, his report was rejected for being “out-of-scope” on the misguided assumption that exploitation of the technical flaw itself required some type of social engineering:
Uber rejects researcher’s report concluding that it requires social engineering (Twitter)
It appears this is not the primary time that Uber has dismissed this specific flaw both.
Bug bounty hunters Soufiane el Habti and Shiva Maharaj declare that they had beforehand reported the problem to Uber with out success [1, 2, 3].
57 million Uber clients and drivers in danger
Opposite to what one could consider, this is not a easy case of e-mail spoofing utilized by menace actors to craft phishing emails.
Actually, the e-mail despatched by the researcher “from Uber” to BleepingComputer handed each DKIM and DMARC safety checks, in response to e-mail headers seen by us.
E-mail despatched “from Uber” passes DKIM and DMARC safety checks (BleepingComputer)
The researcher’s e-mail was despatched through SendGrid, an e-mail advertising and marketing and buyer communications platform utilized by main corporations.
However, Elsallamy tells BleepingComputer that it’s an uncovered endpoint on Uber’s servers chargeable for the flaw and permits anybody to craft an e-mail on behalf of Uber.
The vulnerability is “an HTML injection in certainly one of Uber’s e-mail endpoints,” says Elsallamy, drawing comparability to a comparable flaw found in 2019 on Meta’s (Fb’s) servers by pen-tester Youssef Sammouda.
In Meta’s case, the endpoint regarded an identical to:
https://authorized.tapprd.thefacebook.com/tapprd/Portal/ShowWorkFlow/AnonymousEmbed/XXXXXXXXXXXXX
Understandably, for safety causes, the researcher didn’t disclose the susceptible Uber endpoint.
He questioned Uber, “Deliver your [calculator] and inform me what could be the end result if this vulnerability has been used with the 57 million e-mail [addresses that leaked] from the final information breach?”
“If you already know the end result then inform your staff within the bug bounty triage crew.”
Elsallamy is referring to Uber’s 2016 information breach that uncovered the private info of 57 million Uber clients and drivers.
For this mishap, UK’s Info Commissioner’s Workplace (ICO) had fined Uber £385,000, together with the information safety authority within the Netherlands (Autoriteit Persoonsgegevens) fining the corporate €600.000.
By exploiting this unpatched vulnerability, adversaries can probably ship focused phishing scams to hundreds of thousands of Uber customers beforehand affected by the breach.
When requested what might Uber do to remediate the flaw, the researcher advises:
“They should sanitize the customers’ enter within the susceptible undisclosed type. Because the HTML is being rendered, they could use a safety encoding library to do HTML entity encoding so any HTML seems as textual content,” Elsallamy instructed BleepingComputer.
BleepingComputer reached out to Uber nicely upfront of publishing however has not heard again at the moment.
Uber customers, workers, drivers, and associates ought to be careful for any phishing emails despatched from Uber that look like professional as exploitation of this flaw by menace actors stays a risk.
Replace 11:55 AM: Added reference to the similar flaw having been reported in 2015/16 and March 2021 however dismissed.
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