Vulnerability identifier: #VU26248

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-2020-5267

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
ActionView
Server applications / Frameworks for developing and running applications

Vendor: Rails

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the "j" and "escape_javascript" methods . 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 updates from vendor's website.

Vulnerable software versions

ActionView: 5.0.0 - 6.0.2.1

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External links
http://www.openwall.com/lists/oss-security/2020/03/19/1
http://github.com/rails/rails/commit/033a738817abd6e446e1b320cb7d1a5c15224e9a
http://github.com/rails/rails/security/advisories/GHSA-65cv-r6x7-79hv
http://lists.debian.org/debian-lts-announce/2020/03/msg00022.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.