Vulnerability identifier: #VU28243

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8164

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
actionpack
Web applications / Modules and components for CMS

Vendor: Ruby

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in the return value of "each", or "each_value", or "each_pair" will return the underlying "untrusted" hash of data that was read from the parameters. A remote attacker can gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

actionpack: 6.0.0 - 6.0.3 rc1, 5.2.0 - 5.2.4.2, 5.1.0 - 5.1.7 rc1, 5.0.0 - 5.0.7.2

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External links
http://snyk.io/vuln/SNYK-RUBY-ACTIONPACK-569600
http://github.com/rails/rails/commit/b3230c500d780b5a5d500cc57496074e1d3d8ea9
http://groups.google.com/forum/#!topic/rubyonrails-security/f6ioe4sdpbY

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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.