WordPress security changelog
MEDIUM CVE-2023-6449 Modified

Contact Form 7: Dangerous file upload

Contact Form 7 is affected by dangerous file upload. Exploitation requires an authenticated WordPress account. Successful exploitation can place attacker-controlled executable content on the server and may lead to full site compromise.

CVE / CNA score 6.6 CVSS 3.1 · security@wordfence.com
NVD score 7.2 CVSS 3.1 · nvd@nist.gov
Component
Contact Form 7
Plugin slug
contact-form-7
Affected
See vendor advisory
Safe version
See mitigation notes
Published
Dec 01, 2023
Weakness
CWE-434 — Unrestricted Upload of File with Dangerous Type

This CVE was published Dec 01, 2023 and is one of 11 known issues for this plugin.

What to do

Update, patch or deactivate.

Update Contact Form 7 to a release outside the affected range, or disable and remove it until a fixed version is available.

No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

The Contact Form 7 plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient file type validation in the 'validate' function and insufficient blocklisting on the 'wpcf7_antiscript_file_name' function in versions up to, and including, 5.8.3. This makes it possible for authenticated attackers with editor-level capabilities or above to upload arbitrary files on the affected site's server, but due to the htaccess configuration, remote code cannot be executed in most cases. By default, the file will be deleted from the server immediately. However, in some cases, other plugins may make it possible for the file to live on the server longer. This can make remote code execution possible when combined with another vulnerability, such as local file inclusion.

CVE / CNA vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

NVD vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References

Primary and upstream sources