Vulnerability identifier: #VU17788

Vulnerability risk: High

CVSSv3.1: 9.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]

CVE-ID: CVE-2019-8943

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
WordPress
Web applications / CMS

Vendor: WordPress.ORG

Description
The vulnerability allows a remote attacker to execute PHP code on the target system.

The weakness exists due to path traversal in wp_crop_image(). A remote attacker can write the output image to an arbitrary directory via a filename containing two image extensions and ../ sequences, such as a filename ending with the .jpg?/../../file.jpg substring.

Successful exploitation of the vulnerability is possible when combined with CVE-2019-8942.

Mitigation
Install update from vendor's website.

Vulnerable software versions

WordPress: 5.0 - 5.0.3, 4.9.1 - 4.9.9

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External links
http://blog.ripstech.com/2019/wordpress-image-remote-code-execution/

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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, a fully functional exploit for this vulnerability is available.