#VU8586 Security restrictions bypass in Ruby on Rails - CVE-2016-0753

Vulnerability identifier: #VU8586

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-0753

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Ruby on Rails
Universal components / Libraries / Scripting languages

Vendor: Rails

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

Active Model in Ruby on Rails 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, and 5.x before 5.0.0.beta1.1 supports the use of instance-level writers for class accessors, which allows remote attackers to bypass intended validation steps via crafted parameters.

Mitigation
Update to version 4.1.14.1 or 4.2.5.1.

Vulnerable software versions

Ruby on Rails: 4.1.0 rc1 - 4.1.14.2, 4.2.0 rc1 - 4.2.5

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External links
https://groups.google.com/forum/message/raw?msg=ruby-security-ann/6jQVC1geukQ/3Iy0GU1ZEgAJ

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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.