CVE-2010-3663

Vulnerability

Overview

CVE-2010-3663 describes a critical configuration flaw in the TYPO3 content management system. The core software, prior to versions 4.1.14, 4.2.13, 4.3.4, and 4.4.1, shipped with an insecure default value for the fileDenyPattern variable [1][2]. This variable is used to define which file patterns are denied for upload or manipulation in the backend.

Exploitation

Details

The vulnerability is exploitable by an attacker who possesses a valid backend login [1]. Because the default pattern is insufficiently restrictive, an authenticated user can upload or create files with arbitrary code (e.g., PHP scripts) that the server can execute [2]. The attack vector is network-based (AV:N) and requires low complexity, but authentication is required (Au:S) [1].

Impact

Successful exploitation allows a remote authenticated attacker to achieve arbitrary code execution on the TYPO3 backend server [2]. This can lead to full compromise of the TYPO3 installation, including data theft, site defacement, or further lateral movement within the hosting environment.

Mitigation

The issue was fixed by the TYPO3 Security Team, and the solution is to update to versions 4.1.14, 4.2.13, 4.3.4, or 4.4.1 (or later) [1]. The Debian security tracker also references a fix [4]. No workaround is documented; upgrading is the recommended action.