Multiple vulnerabilities in Retty App

Published: 2021-07-14

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-20747 CVE-2021-20748
CWE-ID	CWE-939 CWE-798
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Retty App for Android Mobile applications / Apps for mobile phones Retty App for iOS Mobile applications / Apps for mobile phones
Vendor

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper Authorization in Handler for Custom URL Scheme

EUVDB-ID: #VU54859

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20747

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

Exploit availability: No

Description

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

The vulnerability exists due to the affected app is launched by Custom URL Scheme. A remote attacker can trick a victim to access an arbitrary URL.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Retty App for Android: before 4.8.13

Retty App for iOS: before 4.11.14

External links

http://jvn.jp/en/jp/JVN26891339/index.html
http://drive.google.com/file/d/1PBYqIsK8QxEEhGJ4SEgpY7iZw3RTTDho/view

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.

2) Use of hard-coded credentials

EUVDB-ID: #VU54860