Information disclosure in Telegram Desktop

1) Missing Authorization

EUVDB-ID: #VU50073

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 - Missing Authorization

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:telegram:telegram_desktop_for_windows:2.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:telegram:telegram_desktop_for_windows:2.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:telegram:telegram_desktop_for_windows:2.4.2:*:*:*:*:*:*:*

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

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.