#VU27540 Spoofing attack in Telegram products - CVE-2020-12474

Vulnerability identifier: #VU27540

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-12474

CWE-ID: CWE-451

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Telegram Desktop for Windows
Client/Desktop applications / Messaging software
Telegram for Android
Mobile applications / Apps for mobile phones
Telegram for iOS
Mobile applications / Apps for mobile phones

Vendor: Telegram

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data passed via a public URL or a group chat invitation URL. A remote attacker can perform an IDN Homograph attack via Punycode.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Telegram Desktop for Windows: 1.0.0 - 2.0.1

Telegram for Android: 5.8.0 - 6.0.1_1911

Telegram for iOS: 5.1 - 6.0.1

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External links
https://github.com/VijayT007/Vulnerability-Database/blob/master/Telegram:CVE-2020-12474

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.