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CERT Coordination Center

NAS4Free version contains a remote command execution vulnerability

Vulnerability Note VU#326830

Original Release Date: 2013-10-30 | Last Revised: 2013-10-30


NAS4Free version and possibly earlier versions contain a remote code execution vulnerability (CWE-94).


CWE-94: Improper Control of Generation of Code ('Code Injection')

NAS4Free version and possibly earlier versions contain a remote code execution vulnerability. NAS4Free allows an authenticated user to post PHP code to an HTTP script and have the code executed remotely. By default, NAS4Free runs with root privileges. A remotely authenticated attacker can send an HTTP POST request that contains a malicious PHP file which can cause the script to run directly on the machine.

For more details, please see Tod Beardsley's Rapid7 blog post.


A remote authenticated attacker may be able to execute arbitrary code as root on the system.


We are currently unaware of a practical solution to this problem.

Vendor Information


NAS4Free Affected

Notified:  October 08, 2013 Updated: October 28, 2013



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group Score Vector
Base 6 AV:N/AC:M/Au:S/C:P/I:P/A:P
Temporal 5.1 E:POC/RL:U/RC:UR
Environmental 1.3 CDP:ND/TD:L/CR:ND/IR:ND/AR:ND



Thanks to Tod Beardsley and Brandon Perry of Rapid7, Inc. for reporting this vulnerability.

This document was written by Adam Rauf.

Other Information

CVE IDs: CVE-2013-3631
Date Public: 2013-10-30
Date First Published: 2013-10-30
Date Last Updated: 2013-10-30 17:13 UTC
Document Revision: 28

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