CVE-2020-12474 : Exploit Details and Defense Strategies

Telegram Desktop through 2.0.1, Telegram through 6.0.1 for Android, and Telegram through 6.0.1 for iOS are vulnerable to an IDN Homograph attack via Punycode in public URLs or group chat invitation URLs.

Understanding CVE-2020-12474

This CVE identifies a security vulnerability in Telegram applications that could be exploited through IDN Homograph attacks.

What is CVE-2020-12474?

CVE-2020-12474 is a security flaw in Telegram applications that allows attackers to conduct IDN Homograph attacks using Punycode in public URLs or group chat invitation URLs.

The Impact of CVE-2020-12474

The vulnerability could lead to phishing attacks, where malicious actors deceive users by displaying visually similar URLs that actually lead to harmful websites.

Technical Details of CVE-2020-12474

Telegram applications are susceptible to IDN Homograph attacks due to improper handling of Punycode in URLs.

Vulnerability Description

The flaw allows threat actors to create URLs with visually similar characters that can trick users into visiting malicious websites.

Affected Systems and Versions

Telegram Desktop through version 2.0.1
Telegram for Android through version 6.0.1
Telegram for iOS through version 6.0.1

Exploitation Mechanism

Attackers can craft URLs with Punycode to display visually similar characters, leading users to believe they are accessing legitimate websites.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2020-12474.

Immediate Steps to Take

Avoid clicking on suspicious URLs received through Telegram.
Be cautious when joining group chats or clicking on shared links.

Long-Term Security Practices

Regularly update Telegram applications to the latest versions.
Educate users about the risks of phishing attacks and how to identify suspicious URLs.

Patching and Updates

Ensure that Telegram applications are updated to versions that address the CVE-2020-12474 vulnerability.