Vulnerability identifier: #VU49388

Vulnerability risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-35717

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
zonote
Client/Desktop applications / Other client software

Vendor: Osvaldo Zonetti

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks via a crafted note, with resultant Remote Code Execution (because nodeIntegration in webPreferences is true).

The vulnerability exists due to insufficient sanitization of user-supplied data within a specially crafted note. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install update from vendor's website.

Vulnerable software versions

zonote: 0.1.0 - 0.4.0

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External links
http://github.com/hmartos/cve-2020-35717
http://github.com/zonetti/zonote
http://medium.com/bugbountywriteup/remote-code-execution-through-cross-site-scripting-in-electron-f3b891ad637
http://www.electronjs.org/apps/zonote

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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.