CVE-2019-20060 in YetiShare
Summary
by MITRE
MFScripts YetiShare v3.5.2 through v4.5.4 places sensitive information in the Referer header. If this leaks, then third parties may discover password-reset hashes, file-delete links, or other sensitive information.
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Analysis
by VulDB Data Team • 05/12/2025
The vulnerability identified as CVE-2019-20060 affects MFScripts YetiShare versions 3.5.2 through 4.5.4, representing a significant security flaw in the handling of sensitive data within HTTP headers. This issue stems from the application's improper management of authentication and access control mechanisms, where critical session tokens and cryptographic hashes are inadvertently exposed through the Referer header during web requests. The vulnerability directly relates to CWE-200, which addresses the exposure of sensitive information through improper data handling, and aligns with ATT&CK technique T1552.001 for unsecured credentials and T1552.004 for credentials in files.
The technical implementation of this flaw occurs when the YetiShare application generates and includes password reset tokens, file deletion URLs, and other sensitive access mechanisms within the Referer header of HTTP requests. This practice violates fundamental security principles of information hiding and access control, as the Referer header is commonly transmitted across network boundaries and may be logged by intermediate proxies, web servers, or third-party services. When these headers leak through network traffic monitoring, access logs, or server-side logging mechanisms, attackers can extract sensitive information that would normally be protected within secure session management protocols. The vulnerability particularly affects applications that rely on token-based authentication and file access controls, where the Referer header becomes a vector for information disclosure.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables attackers to perform unauthorized actions within the affected system. Once an attacker obtains password reset hashes, they can potentially reset user accounts and gain administrative access to the system. Similarly, file deletion links and other access tokens exposed through the Referer header allow for unauthorized file manipulation and data destruction. The vulnerability creates a persistent threat vector that can be exploited across multiple sessions and users, making it particularly dangerous for applications handling sensitive data or providing file sharing capabilities. This flaw essentially undermines the application's authentication and authorization mechanisms, allowing for privilege escalation and unauthorized system access.
Mitigation strategies for CVE-2019-20060 require immediate implementation of proper header management and secure coding practices. Organizations should ensure that sensitive information is not transmitted through HTTP headers, particularly those that are automatically included in requests such as the Referer header. The application should be updated to version 4.5.5 or later, which contains the necessary patches to address this vulnerability. Security measures should include implementing proper input validation, output encoding, and secure session management protocols. Additionally, network administrators should configure web proxies and firewalls to sanitize or remove sensitive information from HTTP headers before they are transmitted across network boundaries. The implementation of Content Security Policy headers and proper header sanitization techniques can help prevent similar vulnerabilities from occurring in the future. Organizations should also conduct thorough security assessments to identify other potential information disclosure vectors and ensure compliance with security standards such as OWASP Top Ten and NIST cybersecurity frameworks.