JVN#84820712: "Rikunabi NEXT" App for Android fails to restrict custom URL schemes properly

Overview

"Rikunabi NEXT" App for Android provided by Recruit Co., Ltd. fails to restrict custom URL schemes properly.

Products Affected

"Rikunabi NEXT" App for Android prior to ver. 11.5.0

Description

"Rikunabi NEXT" App for Android provided by Recruit Co., Ltd. provides the function to access a requested URL using Custom URL Scheme. The App does not restrict access to the function properly (CWE-939) which may be exploited to direct the App to access any sites.

Impact

A remote attacker may lead a user to access an arbitrary website via the vulnerable App. As a result, the user may become a victim of a phishing attack.

Solution

Update the Application
Update the application to the latest version according to the information provided by the developer.
The developer has released the following version that fixes the vulnerability.

"Rikunabi NEXT" App for Android ver. 11.5.0

Vendor Status

Vendor	Status	Last Update	Vendor Notes
Recruit Co., Ltd.	Vulnerable	2023/08/09

References

JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

CVSS v3 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Base Score: 4.3

Attack Vector(AV)	Physical (P)	Local (L)	Adjacent (A)	Network (N)
Attack Complexity(AC)	High (H)	Low (L)
Privileges Required(PR)	High (H)	Low (L)	None (N)
User Interaction(UI)	Required (R)	None (N)
Scope(S)	Unchanged (U)	Changed (C)
Confidentiality Impact(C)	None (N)	Low (L)	High (H)
Integrity Impact(I)	None (N)	Low (L)	High (H)
Availability Impact(A)	None (N)	Low (L)	High (H)

CVSS v2 AV:N/AC:M/Au:N/C:N/I:P/A:N