Insufficient randomization in WordPress WordPress

1) Insufficient randomization

EUVDB-ID: #VU9453

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-17091

CWE-ID: CWE-330 - Use of Insufficiently Random Values

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists in wp-admin/user-new.php script due to usage of a determinate substring in newbloguser key, which can be directly derived from the user ID. A remote attacker can guess the key and bypass intended access restrictions.

Mitigation

Update to version 4.9.1.

Vulnerable software versions

WordPress: 3.7 - 4.9

CPE2.3

• cpe:2.3:a:wordpress_org:wordpress:3.7:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.7.2:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.7.3:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.7.4:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.7.5:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.7.6:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.7.7:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.7.8:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.7.9:*:*:*:*:*:*:*

External links

https://wordpress.org/news/2017/11/wordpress-4-9-1-security-and-maintenance-release/

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.