Horizon Alert
Summary of the vulnerability and why it matters
Concrete CMS versions prior to 9.5.1 allow an attacker to trigger a package upgrade without proper authorization. This occurs because the system doesn't validate a security token before processing a request, potentially enabling a malicious user to force an administrator into performing an upgrade through a simple web link.
- Attackers can force administrator actions.
- This affects installed packages.
- The vulnerable endpoint is reachable from the internet.
Attack Path
How an attacker could exploit the issue
An attacker can exploit this by tricking an authenticated Concrete CMS administrator into clicking a malicious link, which would then trigger a package upgrade on the site without their explicit consent. This could lead to the installation of a compromised package or disrupt the site's functionality.
- Requires admin access.
- Targets dashboard upgrade function.
- Victim must click a link.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability in Concrete CMS allows an attacker to trigger a package upgrade on an authenticated administrator through a cross-site navigation. While the exploit requires the victim to be logged in and have package installation privileges, the lack of CSRF token validation on a sensitive dashboard endpoint makes it an attractive target. Attackers favor such vulnerabilities because they can lead to full system compromise with minimal effort once a user is enticed to click a malicious link.
- Exploitation requires administrator privileges.
- Public exploit code is not yet observed.
- Core functionality upgrade can be triggered.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize blocking or monitoring traffic to the `/dashboard/extend/update/do_update/<pkgHandle>` endpoint for Concrete CMS versions prior to 9.5.1. Investigate any such traffic for signs of exploitation, as this vulnerability allows an attacker to trigger package upgrades by tricking an authenticated administrator.
- Monitor network traffic for suspicious requests to the update endpoint.
- Block requests to the vulnerable endpoint if possible.
- Upgrade Concrete CMS to version 9.5.1 or later.
