Horizon Alert
Summary of the vulnerability and why it matters
A security issue has been identified in a TYPO3 extension that could allow an unauthenticated attacker to execute code on your server by sending a specially crafted cookie. The main concern is confirming relevance and exposure to understand the potential risk.
- Attackers can run malicious code on servers.
- TYPO3 extensions are commonly used for websites.
- Confirm relevance and assess potential exposure.
Attack Path
How an attacker could exploit the issue
An attacker could begin by sending a specially crafted cookie to a TYPO3 server. This cookie, when processed by a vulnerable extension, can lead to the execution of arbitrary code on the server, a risk that is amplified because no authentication is required for exploitation.
- No authentication needed for attack.
- Vulnerable component processes untrusted input.
- Remote code execution on server.
Live Threat
Current exploitation, exposure, and threat context
A remote, unauthenticated attacker could achieve remote code execution on the TYPO3 server by supplying a crafted serialized payload. This occurs when an extension processes untrusted client input from an attacker-controlled cookie directly to PHP's unserialize function, leading to PHP Object Injection when supported by the advisory.
- Server-side code execution.
- Exploiting vulnerable extension parsing.
- Compromise of the web server.
Operational Fix
Recommended remediation, mitigation, and detection steps
This critical vulnerability in a TYPO3 extension allows unauthenticated remote attackers to achieve code execution on the server by exploiting PHP Object Injection via crafted cookies. Identifying where this extension is deployed, assessing its reachability and business criticality, and confirming the accountable owner are the immediate first steps before planning remediation.
- TYPO3 administrators and application owners.
- Verify extension presence and reachability.
- Plan and coordinate remediation actions.
