Vulnerability identifier: #VU7179

Vulnerability risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2017-6922

CWE-ID: CWE-693

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Drupal
Web applications / CMS

Vendor: Drupal

Description
The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to insufficient file protection. A remote attacker can bypass access restrictions and view private files that have been uploaded by an anonymous user but not permanently attached to content on the site.

Successful exploitation of the vulnerability may result in access bypass.

Note: The vulnerability was being actively exploited for spam purposes.

Mitigation
Update to version 7.56 and 8.3.4.

Vulnerable software versions

Drupal: 7.1 - 7.55, 8.3.0 - 8.3.3, 8.2.0 - 8.2.8, 8.1.0 - 8.1.10, 8.0 - 8.0.6

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External links
http://www.drupal.org/SA-CORE-2017-003

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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?

Yes. This vulnerability is being exploited in the wild.