Security restrictions bypass in Telegram for Android

Published: 2019-09-17 | Updated: 2019-09-17
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-16248
CWE ID CWE-399
Exploitation vector Local
Public exploit N/A
Vulnerable software Telegram for Android Subscribe
Vendor Telegram

Security Advisory

This security advisory describes one low risk vulnerability.

1) Resource management error

Severity: Low

CVSSv3: 2.9 [CVSS:3.0/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 - Resource Management Errors

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, 5.8.0, 5.9.0, 5.10.0

CPE External links

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

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.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted app.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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