Vulnerabilities > CVE-2013-3631 - Code Injection vulnerability in Nas4Free 9.1.0.1.798/9.1.0.1.804
Attack vector
NETWORK Attack complexity
MEDIUM Privileges required
SINGLE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
NAS4Free 9.1.0.1.804 and earlier allows remote authenticated users to execute arbitrary PHP code via a request to exec.php, aka the "Advanced | Execute Command" feature. NOTE: this issue might not be a vulnerability, since it appears to be part of legitimate, intentionally-exposed functionality by the developer and is allowed within the intended security policy.
Vulnerable Configurations
Part | Description | Count |
---|---|---|
Application | 2 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Leverage Executable Code in Non-Executable Files An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
- Manipulating User-Controlled Variables This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An attacker can override environment variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the attacker can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.
Exploit-Db
description | NAS4Free - Arbitrary Remote Code Execution. CVE-2013-3631. Remote exploit for php platform |
id | EDB-ID:29320 |
last seen | 2016-02-03 |
modified | 2013-10-31 |
published | 2013-10-31 |
reporter | metasploit |
source | https://www.exploit-db.com/download/29320/ |
title | NAS4Free - Arbitrary Remote Code Execution |
Metasploit
description | NAS4Free allows an authenticated user to post PHP code to a special HTTP script and have the code executed remotely. This module was successfully tested against NAS4Free version 9.1.0.1.804. Earlier builds are likely to be vulnerable as well. |
id | MSF:EXPLOIT/MULTI/HTTP/NAS4FREE_PHP_EXEC |
last seen | 2020-06-07 |
modified | 2020-02-18 |
published | 2013-10-30 |
references | |
reporter | Rapid7 |
source | https://github.com/rapid7/metasploit-framework/blob/master//modules/exploits/multi/http/nas4free_php_exec.rb |
title | NAS4Free Arbitrary Remote Code Execution |
Packetstorm
data source | https://packetstormsecurity.com/files/download/123857/nas4free_php_exec.rb.txt |
id | PACKETSTORM:123857 |
last seen | 2016-12-05 |
published | 2013-10-30 |
reporter | Brandon Perry |
source | https://packetstormsecurity.com/files/123857/NAS4Free-Arbitrary-Remote-Code-Execution.html |
title | NAS4Free Arbitrary Remote Code Execution |