#VU50069 Input validation error in Telegram Desktop for Windows - CVE-2020-17448

Vulnerability identifier: #VU50069

Vulnerability risk: Medium

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-17448

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Telegram Desktop for Windows
Client/Desktop applications / Messaging software

Vendor: Telegram

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing files without extensions. A remote attacker can pass a malicious file without file extension with a spoofed content type and compromise the affected system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Telegram Desktop for Windows: 2.1.0 - 2.1.13

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External links
https://github.com/telegramdesktop/tdesktop/releases/tag/v2.2.0
https://github.com/VijayT007/Vulnerability-Database/blob/master/Telegram-CVE-2020-17448
https://security.gentoo.org/glsa/202101-34
https://telegram.org

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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.