Remote code execution in Mercari Android app



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-5604
CWE-ID CWE-749
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Mercari
Mobile applications / Apps for mobile phones

Vendor mercari

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Exposed dangerous method or function

EUVDB-ID: #VU29578

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2020-5604

CWE-ID: CWE-749 - Exposed Dangerous Method or Function

Exploit availability: No

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

CPE2.3 External links

https://jvn.jp/en/jp/JVN93167107/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.

How the attacker can exploit this vulnerability?

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

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.



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