CVE-2017-8082 in concrete5
Summary
by MITRE
concrete5 8.1.0 has CSRF in Thumbnail Editor in the File Manager, which allows remote attackers to disable the entire installation by merely tricking an admin into viewing a malicious page involving the /tools/required/files/importers/imageeditor?fID=1&imgData= URI. This results in a site-wide denial of service making the site not accessible to any users or any administrators.
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Analysis
by VulDB Data Team • 08/23/2024
The vulnerability identified as CVE-2017-8082 affects concrete5 version 8.1.0 and represents a critical cross-site request forgery flaw within the Thumbnail Editor component of the File Manager module. This vulnerability exists in the administrative interface where the system processes requests to modify image thumbnails through the /tools/required/files/importers/imageeditor endpoint. The flaw allows remote attackers to execute arbitrary actions against authenticated administrative sessions without requiring explicit authorization, fundamentally undermining the security model of the content management system.
The technical implementation of this vulnerability stems from the absence of proper anti-CSRF tokens or validation mechanisms when processing requests to modify file thumbnails. When an administrator visits a malicious page containing embedded requests to the vulnerable endpoint, the system automatically processes these requests without verifying the authenticity of the originating request. The specific URI pattern fID=1&imgData= demonstrates how attackers can manipulate file identifiers and image data parameters to execute destructive operations. This lack of input validation and session confirmation creates a direct pathway for unauthorized administrative actions to be executed on behalf of authenticated users.
The operational impact of this vulnerability is severe and encompasses a complete site-wide denial of service condition. Attackers can exploit this weakness to disable the entire installation by triggering destructive operations through the image editor functionality. The consequences extend beyond simple service disruption as the vulnerability affects accessibility for both regular users and administrative personnel, rendering the entire website inaccessible and effectively taking the site offline. This type of attack can result in significant business disruption, data unavailability, and potential reputational damage for organizations relying on concrete5 for their web presence.
From a cybersecurity framework perspective, this vulnerability maps directly to CWE-352, which specifically addresses Cross-Site Request Forgery weaknesses in web applications. The ATT&CK framework categorizes this as a privilege escalation technique under the T1078 credential access phase, where adversaries leverage legitimate credentials to perform unauthorized actions. The vulnerability also aligns with T1499, which covers network denial of service attacks, as the exploitation results in complete site accessibility disruption. Organizations should implement comprehensive mitigation strategies including input validation, CSRF token implementation, and regular security updates to address this class of vulnerability. The recommended remediation includes upgrading to patched versions of concrete5, implementing proper session management controls, and conducting regular security assessments to identify similar weaknesses in web application frameworks.