Directory traversal in Ruby on Rails

1) Path traversal

EUVDB-ID: #VU8569

Risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-2097

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

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.

The vulnerability exists due to incomplete fix of SB2016021701.

Mitigation

Update to version 3.2.22.2 or 4.1.14.2.

Vulnerable software versions

Ruby on Rails: 3.2.0 - 4.2.5 rc2

External links

http://rubygems.org/gems/railslts-version/versions/3.2.22.2
http://access.redhat.com/errata/RHSA-2016:0454

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.