CVE-2005-4853 in eZ publish
Summary
by MITRE
The default configuration of the forum package in eZ publish 3.5 before 3.5.5, 3.6 before 3.6.2, 3.7 before 3.7.0rc2, and 3.8 before 20050818 does not restrict edit permissions to a posting s owner, which allows remote authenticated users to edit arbitrary postings.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/02/2017
The vulnerability described in CVE-2005-4853 represents a critical access control flaw within the eZ publish forum package that affected multiple versions from 3.5 through 3.8. This issue stems from the default configuration of the forum component where edit permissions are not properly restricted to the original posting owner. The flaw exists in the authorization mechanism that governs user interactions within the forum functionality, creating a scenario where any authenticated user can manipulate content created by others. This misconfiguration violates fundamental security principles of least privilege and proper access controls, allowing unauthorized modification of forum posts across the entire platform. The vulnerability is particularly concerning because it operates at the application level and does not require elevated privileges beyond standard user authentication, making it accessible to any individual who has successfully logged into the system.
The technical implementation of this flaw lies in the forum package's permission model where the system fails to validate whether a requesting user has the appropriate authorization to modify a specific posting. When an authenticated user attempts to edit a forum post, the application does not properly verify that the user is the original author of the content. This validation failure creates a path for privilege escalation through content manipulation, where malicious actors can edit, modify, or delete posts that belong to other users without proper authorization. The vulnerability manifests in the application's business logic layer where the authorization checks are either absent or improperly implemented, leading to a direct violation of the principle of least privilege as defined by CWE-284. The flaw specifically maps to CWE-284 which addresses improper access control and weak authorization mechanisms within software applications.
The operational impact of this vulnerability extends beyond simple content modification to encompass potential data integrity compromise and user trust erosion. Remote authenticated users can manipulate forum discussions, alter user reputations through content changes, and potentially inject malicious content or misinformation into public forums. This capability can be exploited to defame users, disrupt community discussions, or create false information that may influence other forum participants. The vulnerability affects the entire user base since any authenticated individual can exploit this weakness, making it a significant threat to community integrity and platform security. From an attacker's perspective, this represents a low-effort, high-impact vector that requires no specialized tools or advanced technical knowledge beyond standard user authentication credentials. The vulnerability can be leveraged in conjunction with other attack vectors, potentially allowing for more sophisticated social engineering or information manipulation campaigns within the forum environment.
Mitigation strategies for this vulnerability require immediate implementation of proper access control mechanisms within the eZ publish forum package. Organizations should ensure that all forum installations apply the relevant security patches released by eZ publish, specifically upgrading to versions 3.5.5, 3.6.2, 3.7.0rc2, or the 20050818 release for 3.8. The patch implementation addresses the core authorization flaw by enforcing proper validation of posting ownership before allowing edit operations. System administrators should also consider implementing additional monitoring and logging mechanisms to detect unauthorized content modifications, as the default configuration may not provide adequate audit trails for such activities. Security hardening measures including regular security assessments of the forum package and proper configuration reviews can help prevent similar issues in the future. Organizations should also implement the principle of least privilege within their user management systems, ensuring that users have only the permissions necessary for their legitimate roles within the platform. The remediation process should include comprehensive testing to verify that the authorization checks function correctly and that legitimate users retain appropriate access rights while unauthorized modifications are properly blocked. This vulnerability demonstrates the critical importance of proper access control implementation in web applications and serves as a reminder of the potential consequences when authorization mechanisms fail to properly validate user privileges.