Path traversal in Rails Action Mailer for Ruby on Rails

1) Path traversal

EUVDB-ID: #VU32464

Risk: Medium

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:Green]

CVE-ID: CVE-2014-7818

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 perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in actionpack/lib/action_dispatch/middleware/static.rb in Action Pack in Ruby on Rails 3.x before 3.2.20, 4.0.x before 4.0.11, 4.1.x before 4.1.7, and 4.2.x before 4.2.0.beta3, when serve_static_assets is enabled,. A remote authenticated attacker can send a specially crafted HTTP request and remote attackers to determine the existence of files outside the application root via a /.%2F sequence.

Mitigation

The vendor has issued the following versions to address this vulnerability: 3.2.20, 4.0.11, 4.1.7, 4.2.0.

Vulnerable software versions

Action Mailer: 3.2.0 - 4.1.6

CPE2.3

• cpe:2.3:a:rails:actionmailer:3.2.0:*:*:*:*:ruby_on_rails:*:*
• cpe:2.3:a:rails:actionmailer:3.2.1:*:*:*:*:ruby_on_rails:*:*
• cpe:2.3:a:rails:actionmailer:3.2.2:*:*:*:*:ruby_on_rails:*:*

External links

https://lists.opensuse.org/opensuse-updates/2014-11/msg00112.html
https://groups.google.com/forum/message/raw?msg=rubyonrails-security/dCp7duBiQgo/v_R_8PFs5IwJ
https://puppet.com/security/cve/cve-2014-7829

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.