#VU28242 Code Injection in ActionView - CVE-2020-8163

Vulnerability identifier: #VU28242

Vulnerability risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2020-8163

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: Rails

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation. A remote attacker can control the "locals" argument of a "render" call and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ActionView: 0.9.1 - 5.0.0.1

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External links
https://snyk.io/vuln/SNYK-RUBY-ACTIONVIEW-569156
https://groups.google.com/forum/#!topic/rubyonrails-security/hWuKcHyoKh0

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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.