CVE-2011-3128 in WordPress
Summary
by MITRE
WordPress 3.1 before 3.1.3 and 3.2 before Beta 2 treats unattached attachments as published, which might allow remote attackers to obtain sensitive data via vectors related to wp-includes/post.php.
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Analysis
by VulDB Data Team • 11/17/2021
WordPress versions 3.1 before 3.1.3 and 3.2 before Beta 2 contained a significant information disclosure vulnerability that stemmed from improper handling of unattached media attachments within the post management system. This flaw existed in the wp-includes/post.php file where the system failed to properly distinguish between attachments that were explicitly linked to posts and those that remained unattached. The vulnerability arose because unattached media files were being processed with published status rather than being treated as draft or private content, creating an unintended exposure pathway for sensitive media assets.
The technical implementation of this vulnerability involved the WordPress content management system's post handling logic where the system did not adequately validate attachment status during content retrieval operations. When attackers accessed media files through the WordPress API or direct file access patterns, they could potentially obtain unattached attachments that should have remained private or draft status. This misconfiguration allowed unauthorized access to media content that was not explicitly published but was still accessible through the application's internal file handling mechanisms.
The operational impact of this vulnerability extended beyond simple information disclosure to potentially expose sensitive media content including documents, images, and other file types that administrators might have intended to keep private or unpublished. Attackers could leverage this vulnerability to harvest confidential data through various attack vectors including direct API calls, file enumeration techniques, or by exploiting other related vulnerabilities within the WordPress ecosystem. The exposure was particularly concerning because it affected the core post management functionality and could potentially lead to data breaches involving proprietary or sensitive organizational content.
This vulnerability aligns with CWE-200, Information Exposure, and represents a classic case of insufficient access control mechanisms within the WordPress core framework. The issue demonstrates how seemingly minor implementation details in content management systems can create significant security gaps that adversaries can exploit to gain unauthorized access to sensitive resources. From an ATT&CK perspective, this vulnerability maps to T1071.004 Application Layer Protocol: DNS and T1068, Exploitation for Privilege Escalation, as attackers could use the information disclosure to gather intelligence about the target environment. The vulnerability also relates to T1566.001 Phishing: Spearphishing Attachment, as compromised systems might have exposed sensitive attachments that could be used for further social engineering attacks. Organizations should implement immediate mitigations including updating to WordPress 3.1.3 or 3.2 Beta 2, reviewing attachment access controls, and monitoring for unauthorized media file access patterns. Additionally, administrators should consider implementing additional security layers including web application firewalls and access control restrictions to prevent exploitation of similar vulnerabilities in other components of their WordPress installations.