#VU8568 Path traversal in Ruby on Rails - CVE-2016-0752

Vulnerability identifier: #VU8568

Vulnerability risk: Medium

CVSSv4.0: 6.9 [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:A/U:Green]

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 rc1 - 3.2.22, 4.0.0 rc1 - 4.0.13, 4.1.0 rc1 - 4.1.14, 4.2.0 rc1 - 4.2.5

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External links
https://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.