Vulnerability identifier: #VU21164

Vulnerability risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-16248

CWE-ID: CWE-399

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Telegram for Android
Mobile applications / Apps for mobile phones

Vendor: Telegram

Description
The vulnerability allows an attacker to bypass certain security restrictions.

The vulnerability exists due "delete for" feature does not delete images and media files from the Telegram Images directory, removing them from the chat window only. As a result, it is possible to gain access to files that were deleted via the UI interface.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Telegram for Android: 4.9.0 - 5.10.0

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External links
http://github.com/RootUp/PersonalStuff/blob/master/Telegram_Privacy.pdf
http://www.inputzero.io/2019/09/telegram-privacy-fails-again.html
http://www.openwall.com/lists/oss-security/2019/09/09/2

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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