Remote PHP code execution in Drupal

1) Code Injection

EUVDB-ID: #VU17807

Risk: High

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2019-6340

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: Yes

Description

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

The vulnerability exists due to improper input validation when processing field types in requests, related to API functionality. A remote attacker can send a specially crafted request and execute arbitrary PHP code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires that:

• - RESTful Web Services (rest) module is enabled and accepts PATCH or POST requests

OR


• - the site has another web services module enabled, like JSON:API in Drupal 8, or Services or RESTful Web Services in Drupal 7.

Note: we are aware of reports regarding in the wild exploitation of this vulnerability days after the official patch.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Drupal: 8.5.0 - 8.6.9

CPE2.3

• cpe:2.3:a:drupal:drupal:8.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
• cpe:2.3:a:drupal:drupal:8.5.2:*:*:*:*:*:*:*
• cpe:2.3:a:drupal:drupal:8.5.3:*:*:*:*:*:*:*
• cpe:2.3:a:drupal:drupal:8.5.8:*:*:*:*:*:*:*
• cpe:2.3:a:drupal:drupal:8.5.9:*:*:*:*:*:*:*

External links

https://www.drupal.org/
https://www.drupal.org/sa-core-2019-003

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.