CVE-2025-3977 in Dreamer CMS
Summary
by MITRE • 04/27/2025
A vulnerability was found in iteachyou Dreamer CMS up to 4.1.3. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file /admin/attachment/download of the component Attachment Handler. The manipulation of the argument ID leads to improper authorization. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 04/28/2025
This vulnerability resides within the iteachyou Dreamer CMS version 4.1.3 and earlier, specifically targeting the attachment download functionality accessible through the /admin/attachment/download endpoint. The flaw manifests as an improper authorization issue where an attacker can manipulate the ID parameter to gain unauthorized access to attachments that should be restricted to authorized users only. This represents a critical access control vulnerability that undermines the CMS's security model and allows for privilege escalation.
The technical implementation of this vulnerability stems from insufficient input validation and authorization checks within the Attachment Handler component. When a user submits a request to download an attachment through the administrative interface, the system should verify that the requesting user has appropriate permissions to access the specified attachment. However, the current implementation fails to properly validate the ID parameter against user permissions, allowing any authenticated user to potentially access attachments belonging to other users or system resources they shouldn't have access to. This weakness aligns with CWE-285, which addresses improper authorization in software systems.
The operational impact of this vulnerability is significant as it enables remote exploitation without requiring additional authentication credentials beyond basic access to the CMS administration interface. Attackers can leverage this flaw to access sensitive files, documents, or media assets that are typically restricted to administrators or specific user groups. The public disclosure of this exploit means that threat actors can readily implement this attack without requiring specialized knowledge or tools, making it particularly dangerous for organizations using affected CMS versions. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under privilege escalation and credential access categories.
Organizations utilizing iteachyou Dreamer CMS should immediately implement mitigations including immediate patching to the latest available version, implementing additional access controls at the web server level, and conducting thorough audits of attachment permissions and user access rights. The lack of vendor response to early disclosure attempts compounds the risk, suggesting that organizations may need to implement temporary workarounds or alternative security measures until proper patches are available. Network segmentation and monitoring of administrative access patterns should be enhanced to detect potential exploitation attempts, while also reviewing and strengthening overall CMS security configurations to prevent similar authorization bypass issues.