Vulnerabilidade de Modificação de Arquivo de Configuração Não Autenticada em DRC Central Office Services (COS)

The impact of CVE-2026-5756 is substantial due to the lack of authentication required to exploit it. An attacker gaining access to the configuration file can manipulate various server settings, potentially leading to widespread data exfiltration. This could include sensitive student data, test results, or internal system credentials. Furthermore, an attacker could intercept malicious traffic by altering routing rules or redirecting requests. The disruption of testing services is also a significant concern, potentially impacting large-scale educational assessments and causing widespread operational issues. The blast radius extends to all users and services reliant on the COS component.

Educational institutions and organizations utilizing the DRC Central Office Services (COS) – Content Hosting Component in their testing infrastructure are at risk. Specifically, deployments with default or overly permissive file system configurations are particularly vulnerable. Shared hosting environments where multiple users have access to the server's file system are also at increased risk.

1. 2026-04-14Disclosure

   disclosure

1. Reservado2026-04-07
2. Publicada2026-04-14
3. Modificada2026-04-23
4. EPSS atualizado2026-04-22

The primary mitigation strategy for CVE-2026-5756 is to upgrade to a patched version of the DRC Central Office Services (COS) – Content Hosting Component as soon as it becomes available. Until the patch is applied, implement restrictive access controls to the configuration file. This can be achieved by modifying file system permissions to prevent unauthorized modification. Consider implementing a Web Application Firewall (WAF) with rules to detect and block attempts to access or modify the configuration file. Regularly monitor system logs for suspicious activity related to file access and modification.