CVE-2018-12895
wordpress - security update
Description
WordPress through 4.9.6 allows Author users to execute arbitrary code by leveraging directory traversal in the wp-admin/post.php thumb parameter, which is passed to the PHP unlink function and can delete the wp-config.php file. This is related to missing filename validation in the wp-includes/post.php wp_delete_attachment function. The attacker must have capabilities for files and posts that are normally available only to the Author, Editor, and Administrator roles. The attack methodology is to delete wp-config.php and then launch a new installation process to increase the attacker's privileges.
How to fix CVE-2018-12895
To remediate CVE-2018-12895, upgrade the affected package to a fixed version below.
- —upgrade to 4.9.7+dfsg1-1 or later
- —upgrade to 4.7.5+dfsg-2+deb9u4 or later
Is CVE-2018-12895 being exploited?
Likely — EPSS is 89.6%, placing CVE-2018-12895 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (2)
- from 0, < 4.9.7+dfsg1-1
- from 0, < 4.7.5+dfsg-2+deb9u4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |