The Link Library plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the ll_delete_link_fields function in all versions up to, and including, 7.9.4 This makes it possible for unauthenticated attackers to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). Exploitation requires the administrator to have enabled the 'Delete local file on link deletion' plugin option (disabled by default) and to subsequently permanently delete the attacker-submitted link, which is a routine moderation action.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 9
https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/link-library…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/link-library…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/link-library…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/usersubmissi…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/link-library/tags/7.9.4/usersubmissi…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset/3646360/link-library/trunk/link-li…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset?old_path=%2Flink-library/tags/7.9.…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset?reponame=&new=3646361%40link-libra…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/41327dfa-db64-476a-a2…
security@wordfence.com