Improper Authorization in Handler for Custom URL Scheme in Yappli app



Published: 2022-01-04
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-20873
CWE-ID CWE-939
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Yappli
Mobile applications / Apps for mobile phones

Vendor Yappli

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper Authorization in Handler for Custom URL Scheme

EUVDB-ID: #VU59175

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20873

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

Exploit availability: No

Description

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

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Yappli: 7.3.6

External links

http://jvn.jp/en/jp/JVN66422035/index.html
http://support.yappli.co.jp/hc/ja/articles/4410249902745


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

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

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



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