#VU73274 Cross-site scripting in ActionView - CVE-2023-28120

Vulnerability identifier: #VU73274

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-28120

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

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 ActiveSupport when calling a new bytesplice method on a SafeBuffer. 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: 1.0.0 - 7.0.4.2

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External links
https://discuss.rubyonrails.org/t/cve-2023-28120-possible-xss-security-vulnerability-in-safebuffer-bytesplice/82469
https://github.com/rails/rails/releases/tag/v7.0.4.3
https://github.com/rails/rails/releases/tag/v6.1.7.3

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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.