OwnCloud, an open-source file-sharing solution catering to individuals and organizations preferring self-hosted file management, has flagged three critical security vulnerabilities. These flaws pose severe risks, with the most critical issue, CVE-2023-49103, obtaining a maximum CVSS v3 score of 10. This flaw exposes admin passwords, mail server credentials, and license keys in containerized deployments through a dependency on a third-party library. A recommended fix includes deleting a specific file and disabling the 'phpinfo' function in Docker containers. The vulnerability persists even if the 'graphapi' app is disabled, emphasizing the necessity to address the exposed sensitive data. Another vulnerability, scoring 9.8 on CVSS v3, enables an authentication bypass within ownCloud's core library versions 10.6.0 to 10.13.0, allowing unauthorized access to manipulate files without authentication if the user's username is known. Additionally, a subdomain validation bypass issue, scoring 9 on CVSS v3, affects versions of the oauth2 library below 0.6.1. This flaw in the oauth2 app enables attackers to redirect callbacks to their domain by evading validation checks. Recommendations include reinforcing validation codes and temporarily disabling the "Allow Subdomains" option. These vulnerabilities significantly compromise ownCloud's security, potentially exposing sensitive data and enabling stealthy data theft or phishing attacks. This poses serious risks amid ongoing cybersecurity threats targeting file-sharing platforms, with ransomware groups, such as CLOP, exploiting similar vulnerabilities in data theft attacks on numerous global companies.
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