CVE-1999-0471 in Winroute
Summary
by MITRE
The remote proxy server in Winroute allows a remote attacker to reconfigure the proxy without authentication through the "cancel" button.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability described in CVE-1999-0471 represents a critical authentication bypass flaw in the Winroute remote proxy server implementation. This issue stems from inadequate access control mechanisms within the proxy server's user interface, specifically in how it handles the "cancel" button functionality. The vulnerability allows remote attackers to manipulate the proxy server configuration without proper authentication credentials, effectively granting them administrative control over the network proxy service. Such a flaw fundamentally undermines the security posture of any system relying on Winroute for proxy services, as it creates an unauthorized entry point that bypasses standard authentication protocols.
The technical nature of this vulnerability falls under the category of improper access control as classified by CWE-285, where the system fails to properly enforce access restrictions for privileged operations. The flaw manifests through the proxy server's web-based management interface, where the cancel button functionality is improperly implemented to allow configuration changes rather than simply aborting pending operations. This design flaw enables attackers to invoke configuration modifications that should require authentication, essentially providing a backdoor mechanism for unauthorized system reconfiguration. The vulnerability is particularly concerning because it operates at the application layer, making it accessible over the network without requiring physical access or prior exploitation of other vulnerabilities.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it allows attackers to completely reconfigure the proxy server settings to redirect traffic, establish malicious connections, or disable security features. Attackers could potentially redirect all proxy traffic through their own servers, enabling man-in-the-middle attacks and complete traffic interception. The vulnerability affects systems where Winroute proxy servers are deployed, particularly in corporate environments where proxy servers manage network traffic filtering and security policies. This flaw could enable attackers to bypass network security controls, access restricted resources, or establish persistent access points within the network infrastructure.
Mitigation strategies for CVE-1999-0471 should focus on implementing proper authentication controls and input validation within the proxy server interface. Organizations should immediately apply vendor patches if available, or implement network segmentation to isolate proxy servers from untrusted networks. The recommended approach includes enforcing strong authentication mechanisms for all administrative interfaces, implementing proper authorization checks for configuration changes, and monitoring for unauthorized configuration modifications. According to ATT&CK framework, this vulnerability maps to T1078 for valid accounts and T1566 for phishing, as attackers could leverage this flaw to establish persistent access. Network administrators should also consider implementing web application firewalls to monitor and block suspicious configuration change requests, and establish regular audits of proxy server configurations to detect unauthorized modifications. The vulnerability demonstrates the critical importance of proper input validation and access control implementation in network security services, as even seemingly benign interface elements can become security threats when not properly secured.