Server-side request forgery in Drupal 8.x

1) SSRF in Guzzle library

EUVDB-ID: #VU346

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-2016-5385

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary commands on vulnerable system.

The vulnerability exists due to usage of third-party PHP library Guzzle for performing server-side HTTP requests. A remote attacker can use malicious server that returns a 301 HTTP redirect response to local resource to connect to services within internal network or on localhost.

Successful exploitation of this vulnerability may allow an attacker to perform SSRF attack to retrieve information for further attacks against vulnerable system by performing unauthorized connections to local resources, gain access to sensitive information and compromise vulnerable system.

Note: this vulnerability is being actively exploited in the wild and is referred as HTTPoxy.

Mitigation

Install the latest Drupal version 8.1.7:
https://www.drupal.org/project/drupal/releases/8.1.7

Vulnerable software versions

Drupal: 8.0.0 - 8.1.6

External links

http://www.drupal.org/SA-CORE-2016-003
http://httpoxy.org/

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.