Information disclosure in Mercari (Merpay) - Marketplace and Mobile Payments App

1) Improper Authorization in Handler for Custom URL Scheme

EUVDB-ID: #VU57781

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20835

CWE-ID: CWE-939 - Improper Authorization in Handler for Custom URL Scheme

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to improper handling of Intent. A remote attacker can trick a victim to visit a malicious website and gain unauthorized access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mercari (Merpay) - Marketplace and Mobile Payments App: before 4.49.1

External links

http://jvn.jp/en/jp/JVN49465877/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.

Is there known malware, which exploits this vulnerability?

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