Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Wordpress | Wordpress | < 4.9.7 |
| Debian | Debian Linux | 8.0 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/164633/WordPress-4.9.6-Arbitrary-File-DeletExploitThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/104569Third Party AdvisoryVDB Entry
- https://blog.ripstech.com/2018/wordpress-file-delete-to-code-execution/Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/07/msg00046.htmlMailing ListThird Party Advisory
- https://wpvulndb.com/vulnerabilities/9100Third Party Advisory
- https://www.debian.org/security/2018/dsa-4250Third Party Advisory
- http://packetstormsecurity.com/files/164633/WordPress-4.9.6-Arbitrary-File-DeletExploitThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/104569Third Party AdvisoryVDB Entry
- https://blog.ripstech.com/2018/wordpress-file-delete-to-code-execution/Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/07/msg00046.htmlMailing ListThird Party Advisory
- https://wpvulndb.com/vulnerabilities/9100Third Party Advisory
- https://www.debian.org/security/2018/dsa-4250Third Party Advisory
FAQ
What is CVE-2018-12895?
CVE-2018-12895 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 del...
How severe is CVE-2018-12895?
CVE-2018-12895 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-12895?
Check the references section above for vendor advisories and patch information. Affected products include: Wordpress Wordpress, Debian Debian Linux.