Externally Controlled Reference to a Resource in Another Sphere in Shopware Shopware

1) Externally Controlled Reference to a Resource in Another Sphere

EUVDB-ID: #VU31164

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-18357

CWE-ID: CWE-610 - Externally Controlled Reference to a Resource in Another Sphere

Exploit availability: No

Description

The vulnerability allows a remote authenticated user to gain access to sensitive information.

Shopware before 5.3.4 has a PHP Object Instantiation issue via the sort parameter to the loadPreviewAction() method of the Shopware_Controllers_Backend_ProductStream controller, with resultant XXE via instantiation of a SimpleXMLElement object.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Shopware: 5.3.0 - 5.3.3

External links

http://packetstormsecurity.com/files/152995/Shopware-createInstanceFromNamedArguments-PHP-Object-Instantiation.html
http://blog.ripstech.com/2017/shopware-php-object-instantiation-to-blind-xxe/
http://demo.ripstech.com/projects/shopware_5.3.3

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.