#VU4860 Spoofing attack in WordPress - CVE-2017-5491

Vulnerability identifier: #VU4860

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-5491

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WordPress
Web applications / CMS

Vendor: WordPress.ORG

Description

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

The vulnerability exists due to an error within wp-mail.php script. A remote attacker can bypass imposed posting restrictions using a spoofed mail server with name mail.example.com.

Successful exploitation of the vulnerability may allow an attacker to perform unauthorized postings.

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.