#VU4856 Information disclosure in WordPress - CVE-2017-5487

Vulnerability identifier: #VU4856

Vulnerability risk: Low

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2017-5487

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
WordPress
Web applications / CMS

Vendor: WordPress.ORG

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to incorrectly implemented restrictions within REST API ("wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php") when accessing listings of post authors via HTTP request to "wp-json/wp/v2/users" URL. A remote attacker can send a specially crafted HTTP request to vulnerable URL and obtain potentially sensitive data.

Successful exploitation of the vulnerability may allow an attacker to gain access to otherwise restricted sensitive information.

Mitigation
Update to version 4.7.1.

Vulnerable software versions

WordPress: 4.7

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External links
https://wordpress.org/news/2017/01/wordpress-4-7-1-security-and-maintenance-release/

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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. However, proof of concept for this vulnerability is available.