Vulnerability identifier: #VU8568

Vulnerability risk: Medium

CVSSv3.1: 5.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2016-0752

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: Rails

Description
The vulnerability allows a remote attacker to read arbitrary files on the system.

The vulnerability exists due to improper input validation in Action View. A remote attacker can send a specially crafted request, containing directory traversal sequences (e.g. "../") and view contents of arbitrary file on vulnerable system.

Mitigation
Update to version 3.2.22.1, 4.1.14.1 or 4.2.5.1.

Vulnerable software versions

Ruby on Rails: 3.2.0 - 3.2.22, 4.0.0 - 4.0.13 rc1, 4.1.0 - 4.1.14 rc2, 4.2.0 - 4.2.5 rc2

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External links
http://groups.google.com/forum/message/raw?msg=ruby-security-ann/335P1DcLG00/JXcBnTtZEgAJ

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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?

Yes. This vulnerability is being exploited in the wild.