CVE-2001-0721 in Windows
Summary
by MITRE
Universal Plug and Play (UPnP) in Windows 98, 98SE, ME, and XP allows remote attackers to cause a denial of service (memory consumption or crash) via a malformed UPnP request.
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Analysis
by VulDB Data Team • 05/17/2019
The vulnerability identified as CVE-2001-0721 represents a critical flaw in the Universal Plug and Play implementation across multiple Windows operating systems including Windows 98 98SE ME and XP. This issue stems from insufficient input validation mechanisms within the UPnP service which is designed to enable automatic discovery and configuration of network devices without requiring manual intervention. The vulnerability specifically targets the UPnP protocol implementation that allows devices to communicate and negotiate network settings automatically. When a malformed UPnP request is received by the affected systems the protocol handler fails to properly validate or sanitize the incoming data structure leading to unpredictable behavior.
The technical flaw manifests through improper handling of malformed UPnP requests that exploit weaknesses in the parsing and processing logic of the UPnP service component. This vulnerability falls under the category of improper input validation as defined by CWE-20 which specifically addresses issues where applications fail to properly validate or sanitize input data before processing. The malformed requests can be crafted to consume excessive memory resources or trigger buffer overflows that result in system crashes and subsequent denial of service conditions. Attackers can leverage this vulnerability by sending specially crafted UPnP packets to the target system without requiring any authentication or privileged access.
The operational impact of this vulnerability extends beyond simple service disruption as it can be exploited remotely without requiring user interaction or elevated privileges. This makes it particularly dangerous in networked environments where UPnP services may be exposed to external networks or where devices automatically accept incoming connections. The denial of service conditions can render affected systems unusable for legitimate network operations and may require system restarts to restore normal functionality. Organizations running these legacy operating systems face significant risk as the vulnerability affects widely deployed desktop and workstation platforms that were prevalent during the early 2000s era.
Mitigation strategies for CVE-2001-0721 should focus on disabling UPnP services when not required and implementing network segmentation to prevent unauthorized access to affected systems. Network administrators should consider disabling UPnP functionality at the router level or firewall configuration to prevent external exploitation. The vulnerability aligns with ATT&CK technique T1210 which describes the exploitation of remote services through malformed requests or buffer overflows. System hardening measures including disabling unnecessary network services and implementing proper network access controls can significantly reduce the attack surface. Organizations should also consider upgrading to supported operating system versions that have addressed this vulnerability through security patches and updates.
The broader implications of this vulnerability highlight the importance of input validation and proper error handling in network services as outlined in the OWASP Top Ten security risks. This flaw demonstrates how seemingly benign protocol implementations can become attack vectors when proper security controls are not implemented. The vulnerability also illustrates the challenges associated with maintaining legacy systems where patches and updates may not be available or practical to implement in enterprise environments. Security professionals should consider this vulnerability as part of comprehensive network security assessments and implement monitoring solutions to detect unusual UPnP traffic patterns that may indicate exploitation attempts.