Vulnerability identifier: #VU4202

Vulnerability risk: Critical

CVSSv3.1: 9.2 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]

CVE-ID: CVE-2012-6498

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Atomymaxsite
Web applications / Other software

Vendor: Atomymaxsite

Description
The vulnerability allows a remote attacker to cause arbitrary code execution on the original server.

The weakness exists due to improper validation of file extensions in "index.php" script when uploading files. A remote attacker can upload arbitrary file with .php extension and execute it on the system with privileges of the web server.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Atomymaxsite: 1.50 - 2.5

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External links
http://www.youtube.com/watch?v=CfvTCSS3LGY
http://www.thaicert.or.th/alerts/admin/2012/al2012ad025.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.