Unprotected T-Mobile API Let Anyone Get Customer Data With Just a Phone Number

A security vulnerability in T-Mobile's website let anyone gain access to the personal details of any T-Mobile customer using just a phone number, reports ZDNet.

An internal T-Mobile employee tool, promotool.t-mobile.com, had a hidden API that provided T-Mobile customer data when a customer's cell phone number was added to the end of the web address. Data that was available included full name, address, billing account number, and for some customers, tax identification numbers.


Account data, such as service status and billing status was also included, but it does not appear that credit card numbers, passwords, or other sensitive information was compromised. ZDNet says that there were "references to account PINs used by customers as a security question" which could be used to hijack T-Mobile accounts.

The API was used by T-Mobile staff to look up customer data, but it was accessible to the public and not protected by a password. T-Mobile rectified the issue in early April after it was disclosed by security researcher Ryan Stevenson, who ultimately earned $1,000.

In a statement provided to ZDNet, T-Mobile says that it does not appear customer data was accessed using the API, but research suggests the API had been exposed since at least October 2017.

A T-Mobile spokesperson said: "The bug bounty program exists so that researchers can alert us to vulnerabilities, which is what happened here, and we support this type of responsible and coordinated disclosure." "The bug was patched as soon as possible and we have no evidence that any customer information was accessed," the spokesperson added.

This is not the first unprotected API issue that T-Mobile has faced. Last year, a similar bug also exposed customer data to hackers.

T-Mobile has more than 74 million customers, and had this most recent bug been exploited, a simple script could have provided hackers with access to data on millions of people.

Top Rated Comments

(View all)
Avatar
29 months ago
Pro tip from someone that works in Information Assurance, and has been involved in cleaning up several companies’ similar messes: anytime you see “we have no evidence that any customer information was accessed”, you can assume that they have zero logging. They ‘have no evidence’ because they have no logs; they aren’t saying it didn’t happen, it’s just a nice way to make it seem like nothing bad happened. Ask for evidence proving nothing bad happened, and you’ll be met with a horrified stare.
Score: 19 Votes (Like | Disagree)
Avatar
29 months ago
Makes me think back to this conversation with TMobile on Twitter about the passwords being stored in plaintext (though it was TMO Austria).

https://twitter.com/tmobileat/status/981418339653300224

“Our security is amazingly good” LOL



Score: 16 Votes (Like | Disagree)
Avatar
29 months ago
Until we start punishing these stupid mistakes with penalties that actually hurt, this is just going to happen over and over...
Score: 15 Votes (Like | Disagree)
Avatar
29 months ago
Only $1000 for a catastrophic possible breach discovery? That's like getting paid $45 in a contest that was used as the Mets logo.
Score: 9 Votes (Like | Disagree)
Avatar
29 months ago
#uncarrier #unsafe #uncool
Score: 2 Votes (Like | Disagree)
Avatar
29 months ago

#uncarrier #unsafe #uncool

Doesn't that apply to most big providers in the USA.:rolleyes:
The other big ones have their own "issues".
Score: 2 Votes (Like | Disagree)

Top Stories

Apple Takes Legal Action Against Small Company With Pear Logo

Saturday August 8, 2020 11:09 am PDT by
Apple is taking legal action against the developers of the app "Prepear" due to its logo, according to iPhone in Canada. Prepear is an app that helps users discover recipes, plan meals, make lists, and arrange grocery deliveries. The app is a spinoff of "Super Healthy Kids," and the founders claim that they are facing litigation from Apple. Apple reportedly takes issue with Prepear's logo, ...

Kuo: Global iPhone Shipments Could Decline Up to 30% If Apple Forced to Remove WeChat From App Store [Updated x2]

Sunday August 9, 2020 10:17 pm PDT by
In a worst-case scenario, Apple's annual global iPhone shipments could decline by 25–30% if it is forced to remove WeChat from its App Stores around the world, according to a new research note from analyst Ming-Chi Kuo viewed by MacRumors. The removal could occur due to a recent executive order aiming to ban U.S. transactions with WeChat and its parent company Tencent. Kuo lays out...

iPhone Maker Foxconn Says China's 'Days as the World's Factory Are Done'

Wednesday August 12, 2020 7:55 am PDT by
China will no longer be the world's manufacturing epicenter going forward, according to Apple's largest supply chain partner Foxconn, which has been gradually expanding its operations in other countries amid the U.S.-China trade war. "No matter if it's India, Southeast Asia or the Americas, there will be a manufacturing ecosystem in each," said Foxconn chairman Young Liu, according to Bloombe...

Google Maps Debuts New Apple Watch App and CarPlay Features

Monday August 10, 2020 9:16 am PDT by
Google today announced the launch of several features for Google Maps on Apple products, including new CarPlay functionality and a new Google Maps app that works on Apple Watch. The new Google Maps app for Apple Watch works similarly to the iOS app, allowing Apple Watch owners to get directions for a car, bike, public transit, or on foot. The app supports estimated arrival times and...

Apple May Release 4G-Only iPhone 12 in Early 2021

Tuesday August 11, 2020 5:28 am PDT by
In a research note shared by Business Insider, Wedbush Securities analysts said that Apple may release a cheaper iPhone 12 in early 2021 with no 5G connectivity. Wedbush initially believed Apple would launch a mix of 4G and 5G iPhone 12 models this fall. Following re-examination of Asian supply chains, analysts Daniel Ives, Strecker Backe, and Ahmad Khalil revised the predictions,...

iPad Pro Keyboard Comparison: Logitech's $160 Folio Touch vs. Apple's $300 Magic Keyboard

Tuesday August 11, 2020 2:11 pm PDT by
Logitech recently debuted the Folio Touch, a keyboard and trackpad case designed for the 11-inch iPad Pro that serves as an alternative to the Magic Keyboard. In our latest YouTube video, we compare the $160 Folio Touch to Apple's $300 Magic Keyboard to see which is better. Subscribe to the MacRumors YouTube channel for more videos. Logitech is selling the Folio Touch for $160, while Apple's...

Foxconn Reportedly Begins Seasonal Hiring Spree for iPhone 12 Production

Monday August 10, 2020 7:03 am PDT by
Apple's largest manufacturing partner Foxconn has begun its seasonal hiring spree to assist with iPhone 12 production, offering employees who recruit qualified applicants up to a 9,000 yuan bonus, according to Chinese media reports. As usual, Foxconn needs as many hands on deck as possible at its factory in Zhengzhou, China to assist with mass production of the upcoming iPhones. Apple is...

Apple Seeds First Public Beta of watchOS 7 to Public Beta Testers

Monday August 10, 2020 10:33 am PDT by
Apple today seeded the first public beta of an upcoming watchOS 7 update to public beta testers, one week after seeding the fourth beta to developers and a month and a half after the Worldwide Developers Conference. The update can be downloaded after installing the proper profile from Apple's Public Beta website. watchOS 7 should not be installed on a primary device as it is still an early...

Apple Watch Likely to Adopt MicroLED Display Technology in 3-4 Years

Monday August 10, 2020 2:55 am PDT by
This year's Apple Watch Series 6 is expected to feature an OLED screen like previous models, but a future model is likely to be the first Apple product to adopt MicroLED display technology, albeit not for another three to four years. That's the main takeaway reading between the lines of comments made by the chairman of Epistar, Taiwan's top LED producer, which is reportedly working on a...

Parallels Desktop 16 Brings macOS Big Sur Support, Multi-Touch Gestures, 20% Faster DirectX, and More

Tuesday August 11, 2020 2:17 am PDT by
Parallels Desktop 16 released today, bringing some notable new features and performance enhancements to the virtualization software, including full support for macOS Big Sur. When Apple introduced macOS Big Sur, it ended support for the third-party kernel extensions that previous versions of Parallels were built on. That forced the developers to re-engineer the virtualization software from the ...