Improper Certificate Validation in LINE client for iOS

1) Improper Certificate Validation

EUVDB-ID: #VU88992

Risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-5554

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to financial module lacks server certificate verification in log transmission. A remote attacker can perform a man-in-the-middle (MitM) attack and eavesdrop communication.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

LINE Client for iOS: 13.12.0

External links

http://hackerone.com/reports/2106827
http://jvn.jp/en/vu/JVNVU91696361/index.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to perform certain actions on the device.

Is there known malware, which exploits this vulnerability?

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