An app all attendees of the upcoming Beijing Olympics must use has encryption flaws that could allow personal information to leak, a cyber security watchdog said Tuesday.

The “simple but devastating flaw” in the encryption of the MY2022 app, which is used to monitor Covid and is mandatory for athletes, journalists and other attendees of the games in China’s capital, could allow health information, voice messages and other data to leak, warned Jeffrey Knockel, author of the report for Citizen Lab.

The International Olympic Committee responded to the report by saying users can disable the app’s access to parts of their phones and that assessments from two unnamed cyber security organizations “confirmed that there are no critical vulnerabilities.”

“The user is in control over what the… app can access on their device,” the committee told AFP, adding that installing it on cellphones isn’t required “as accredited personnel can log on to the health monitoring system on the web page instead.”

The committee said it had asked Citizen Lab for its report “to understand their concerns better.”

Unclear who app shares information with

Citizen Lab said it notified the Chinese organizing committee for the Games of the issues in early December and gave them 15 days to respond and 45 days to fix the problem, but received no reply.

“China has a history of undermining encryption technology to perform political censorship and surveillance,” Knockel wrote. 

“As such, it is reasonable to ask whether the encryption in this app was intentionally sabotaged for surveillance purposes or whether the defect was born of developer negligence,” he continued, adding that “the case for the Chinese government sabotaging MY2022’s encryption is problematic.”

NEW REPORT

Cross-country Exposure: Analysis of the MY2022 Olympics apphttps://t.co/g3HydeD9Aa

— Citizen Lab (@citizenlab) January 18, 2022

The flaws affect SSL certificates, which allow online entities to communicate securely. 

MY2022 doesn’t authenticate SSL certificates, meaning other parties could access the app’s data, while data is transmitted without the usual encryption SSL certificates have, Knockel wrote.

While the app is transparent about the medical information it collects as part of China’s efforts to screen Covid-19 cases, he said “it is unclear with whom or which organization(s) it shares this information.”

May violate Google, Apple policies

MY2022 also contains a list called “illegalwords.txt” of “politically sensitive” phrases in China, many of which relate to China’s political situation or its Tibetan and Uighur Muslim minorities.

These include keywords like “CCP evil” and Xi Jinping, China’s president, though Knockel said it was unclear if the list was being actively used for censorship purposes.

Because of these features, the app may violate both Google and Apple policies around smartphone software, and “also China’s own laws and national standards pertaining to privacy protection, providing potential avenues for future redress,” he wrote.

This content was originally published here.