Security News > 2021 > August > India's Koo, a Twitter-like Service, Found Vulnerable to Critical Worm Attacks

Koo, India's homegrown Twitter clone, recently patched a serious security vulnerability that could have been exploited to execute arbitrary JavaScript code against hundreds of thousands of its users, spreading the attack across the platform.

The vulnerability involves a stored cross-site scripting flaw in Koo's web application that allows malicious scripts to be embedded directly into the affected web application.

To carry out the attack, all a malicious actor had to do was log into the service via the web application and post an XSS-encoded payload to its timeline, which automatically gets executed on behalf of all users who saw the post.

The issue was discovered by security researcher Rahul Kankrale in July, following which a fix was rolled out by Koo on July 3.

The end result of this vulnerability in Koo, also known as XSS worm, is more worrisome because it automatically propagates malicious code among a website's visitors to infect other users-without any user interaction, like a chain reaction.

Koo, which launched in November 2019, bills itself as an Indian alternative to Twitter and boasts of 6 million active users on its platform.

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