Vulnerability identifier: #VU29137

Vulnerability risk: Medium

CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-13665

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Drupal
Web applications / CMS

Vendor: Drupal

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing JSON:API PATCH requests. A remote attacker can pass specially crafted input to the application and bypass implemented security restrictions.

By default, JSON:API works in a read-only mode which makes it impossible to exploit the vulnerability. Only sites that have the read_only set to FALSE under jsonapi.settings config are vulnerable.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Drupal: 9.0.0 - 9.0.0 rc1, 8.9.0 - 8.9.0 rc1, 8.8.0 - 8.8.7

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External links
http://www.drupal.org/sa-core-2020-006

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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.