MySejahtera exploits revealed, users getting spam texts and emails - SoyaCincau

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MySejahtera exploits revealed, users getting spam texts and emails - SoyaCincau
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Malaysians have been getting spammed with texts and emails supposedly from MySejahtera. Here's what we know so far.

written by one Phakorn Kiong and published a few days ago, who claims to have used the MySejahtera app for roughly 2 months last year. According to him, after finding out that MySejahtera allowed those who received their COVID-19 jabs abroad to, he tried out the feature and followed the instructions given.

However, he met into an error page, and so looked through the MySejahtera website’s code to find that there were some mistakes in the code. He decided to sign up for the digital certificate anyway despite the error page by bypassing it altogether. Kiong achieved this by submitting his request directly via the API endpoint. Upon submitting his request that way, he received an auto-generated email that confirmed his details.

Kiong would then find out a few more quirks with the MySejahtera website. For one, because all the information that you submit in a request was saved as an HTML string before being sent back to you as an email, you could technically abuse it to get the MySejahtera helpdesk to send an email to any email address that you used during the request submission. It required no authentication token and had no rate limit imposed on it too.

From what we can tell so far, it seems as though that MySejahtera’s database as not been compromised, but that there was a loophole with the API for the OTP SMS and email. Hopefully we’d be getting further clarifications from the MySejahtera team on what happened soon.

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