#VU88992 Improper Certificate Validation in LINE Client for iOS - CVE-2023-5554

Vulnerability identifier: #VU88992

Vulnerability risk: Medium

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

CVE-ID: CVE-2023-5554

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
LINE Client for iOS
Mobile applications / Apps for mobile phones

Vendor: LY Corporation

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

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

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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