Vulnerability identifier: #VU7180

Vulnerability risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6920

CWE-ID: CWE-19

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Drupal
Web applications / CMS

Vendor: Drupal

Description
The vulnerability allows a remote attacker to execute PHP code on the target system.

The weakness exists due to improper handling of PHP objects by PECL YAML parser during certain operations within Drupal core. A remote attacker can send a specially crafted file and execute PHP code on the vulnerable system.

Mitigation
Update to version 8.3.4.

Vulnerable software versions

Drupal: 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?

No. We are not aware of malware exploiting this vulnerability.