Vulnerability identifier: #VU425

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-3163

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Drupal
Web applications / CMS

Vendor: Drupal

Description
The vulnerability allows remote users to perform brute-force attack on the target system.
The vulnerability exists due to XML-RPC system that allows attackers to repeat the same methods of security bypass suitable for brute-force attacks (e.g. determine the user's password by quessing all possible combinations).
Successful exploitation of this vulnerability may result in performing brute-force attack on the vulnerable system.

Mitigation
Update 6.x to 6.38.
https://www.drupal.org/drupal-6.38-release-notes
Update 7.x. to 7.43.
https://www.drupal.org/project/drupal/releases/7.43

Vulnerable software versions

Drupal: 6.0 - 6.37, 7.1 - 7.42

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External links
http://www.drupal.org/SA-CORE-2016-001

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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.