Vulnerability identifier: #VU29578

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-5604

CWE-ID: CWE-749

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mercari
Mobile applications / Apps for mobile phones

Vendor: mercari

Description

The vulnerability allows a remote attacker to execute arbitrary method of the Java object.

The vuůnerability exists due to inadequate restrictions on "addJavascriptInterface" of WebView class. A remote attacker can perform a man-in-the-middle attack, use Java Reflection API of JavaScript code for on the WebView and execute an arbitrary method of Java object. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mercari: All versions

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External links
http://jvn.jp/en/jp/JVN93167107/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. However, proof of concept for this vulnerability is available.