Vulnerability identifier: #VU21790

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-17673

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WordPress
Web applications / CMS

Vendor: WordPress.ORG

Description

The vulnerability allows a remote attacker to perform a spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input passed via the Vary: Origin header. A remote attacker can send a specially crafted HTTP GET request to poison the cache of JSON files.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

WordPress: 3.7 - 3.7.30, 3.8 - 3.8.30, 3.9 - 3.9.28, 4.0 - 4.0.27, 4.4 - 4.4.20, 4.1 - 4.1.27, 4.2 - 4.2.24, 4.3 - 4.3.20, 4.5 - 4.5.18, 4.6 - 4.6.15, 4.7 - 4.7.14, 4.8 - 4.8.10, 4.9 - 4.9.11, 5.0 - 5.0.6, 5.1 - 5.1.2, 5.2 - 5.2.3

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External links
http://wordpress.org/news/2019/10/wordpress-5-2-4-security-release/
http://github.com/WordPress/WordPress/commit/b224c251adfa16a5f84074a3c0886270c9df38de
http://blog.wpscan.org/wordpress/security/release/2019/10/15/wordpress-524-security-release-breakdown.html

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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.