#VU50073 Missing Authorization in Telegram Desktop for Windows - CVE-2020-25824

Vulnerability identifier: #VU50073

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-25824

CWE-ID: CWE-862

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 gain access to sensitive information.

The vulnerability exists due to the application does not require passcode entry upon pushing the Export key within the Export Telegram Data wizard. The threat model is a victim who has voluntarily opened Export Wizard but is then distracted. An attacker then approaches the unattended desktop and pushes the Export key. This attacker may consequently gain access to all chat conversation and media files.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Telegram Desktop for Windows: 2.4.0 - 2.4.3

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External links
https://github.com/soheilsamanabadi/vulnerability/blob/main/Telegram-Desktop-CVE-2020-25824
https://github.com/telegramdesktop/tdesktop/releases/tag/v2.4.3
https://security.gentoo.org/glsa/202101-34
https://www.Telegram.org

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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