CVE-2009-0816 in TYPO3
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in the backend user interface in TYPO3 3.3.x through 3.8.x, 4.0 before 4.0.12, 4.1 before 4.1.10, 4.2 before 4.2.6, and 4.3alpha1 allow remote attackers to inject arbitrary web script or HTML via unspecified fields.
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Analysis
by VulDB Data Team • 08/28/2019
The vulnerability identified as CVE-2009-0816 represents a significant security flaw in the TYPO3 content management system that affects multiple versions from 3.3.x through 4.3alpha1. This cross-site scripting vulnerability specifically targets the backend user interface of TYPO3 installations, creating a critical attack surface that could be exploited by remote threat actors. The flaw allows malicious users to inject arbitrary web scripts or HTML content into unspecified fields within the administrative interface, potentially compromising the security of TYPO3 installations and their underlying data. This vulnerability is particularly dangerous because it operates within the backend environment where administrators perform critical system management tasks, making it a prime target for attackers seeking to escalate privileges or gain persistent access to systems.
The technical implementation of this XSS vulnerability stems from inadequate input validation and output sanitization within TYPO3's backend user interface components. The unspecified fields mentioned in the vulnerability description likely include form inputs, configuration parameters, or administrative settings where user-provided data is not properly escaped or filtered before being rendered back to users. This failure to implement proper security controls creates an environment where malicious scripts can be executed within the context of authenticated admin sessions, potentially allowing attackers to perform actions such as modifying content, accessing sensitive data, or even executing arbitrary code on the server. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws where untrusted data is improperly handled in web applications, making it a classic example of insecure data handling in web interfaces.
The operational impact of CVE-2009-0816 extends beyond simple script injection, as it can enable attackers to establish persistent access to TYPO3 installations and potentially compromise entire web infrastructures. When administrators interact with compromised backend interfaces, they become unwitting participants in executing malicious payloads, which could include credential theft, session hijacking, or data exfiltration. The vulnerability's presence in multiple TYPO3 versions indicates a widespread issue that affected a significant portion of web applications using this CMS, particularly given TYPO3's widespread adoption in enterprise and government environments. Attackers could exploit this vulnerability to gain elevated privileges, modify website content, or even redirect users to malicious sites, making it a critical concern for organizations relying on TYPO3 for their web presence.
Organizations affected by this vulnerability should implement immediate mitigations including upgrading to patched versions of TYPO3 as specified in the advisory releases for versions 4.0.12, 4.1.10, 4.2.6, and subsequent releases. The remediation process should involve comprehensive patch management procedures and thorough testing of updated systems to ensure compatibility with existing configurations. Additionally, implementing proper input validation controls and output encoding measures within the application code can provide defense-in-depth protection against similar vulnerabilities. Security monitoring should be enhanced to detect suspicious activities in administrative interfaces, and access controls should be strengthened to limit exposure. This vulnerability demonstrates the importance of maintaining current security practices and adhering to the principle of least privilege in web application development, as outlined in various cybersecurity frameworks including those referenced in the ATT&CK matrix for web application attacks and credential access techniques. The incident underscores the necessity of regular security assessments and vulnerability management programs to prevent exploitation of known flaws in widely deployed web applications.