CVE-2001-0505 in Services
Summary
by MITRE
Multiple memory leaks in Microsoft Services for Unix 2.0 allow remote attackers to cause a denial of service (memory exhaustion) via a large number of malformed requests to (1) the Telnet service, or (2) the NFS service.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 12/30/2024
The vulnerability identified as CVE-2001-0505 represents a critical memory management flaw within Microsoft Services for Unix 2.0, a suite of services that enabled unix-like functionality on windows platforms. This vulnerability specifically targets the Telnet and NFS services within the software stack, creating a pathway for remote attackers to exploit memory leakage issues that can ultimately lead to system resource exhaustion and denial of service conditions. The flaw manifests when the services receive malformed requests that are not properly handled, causing the memory allocated for processing these requests to be repeatedly allocated without proper deallocation, leading to progressive memory consumption over time.
The technical implementation of this vulnerability stems from inadequate input validation and memory management practices within the service handling components. When the Telnet or NFS services process malformed requests, they fail to properly clean up allocated memory resources, resulting in memory leaks that accumulate with each malicious request. This type of vulnerability falls under the category of memory leak weaknesses as defined by CWE-401, where the system fails to release memory that is no longer needed. The vulnerability is particularly dangerous because it can be exploited remotely without requiring authentication, making it accessible to any attacker who can reach the affected services on the network. The flaw demonstrates poor defensive programming practices and inadequate error handling mechanisms that are fundamental requirements for secure system design.
The operational impact of CVE-2001-0505 is significant as it allows attackers to consume system resources progressively through repeated malformed requests, eventually leading to complete system exhaustion and denial of service for legitimate users. The memory exhaustion can cause the affected services to crash or become unresponsive, disrupting critical network operations and potentially affecting other services running on the same system. This vulnerability directly aligns with the ATT&CK framework's technique T1499.004, which describes resource exhaustion attacks targeting network services, and represents a classic example of how improper memory management can be exploited for denial of service purposes. The attack vector is particularly concerning because it operates at the service level, meaning that successful exploitation can affect the availability of network resources and compromise the overall system stability.
Mitigation strategies for this vulnerability require immediate implementation of service updates and patches provided by Microsoft, as well as network-level security controls to limit access to the affected services. Organizations should implement proper input validation mechanisms at the network boundary to filter out malformed requests before they reach the vulnerable services. Network segmentation and access control measures can help reduce the attack surface by limiting which systems can communicate with the affected services. Additionally, monitoring and alerting systems should be deployed to detect unusual memory consumption patterns that may indicate exploitation attempts. The vulnerability highlights the importance of proper memory management practices and input validation as outlined in the OWASP Top Ten security principles, specifically addressing the need for secure coding practices to prevent resource exhaustion attacks. System administrators should also consider implementing rate limiting and connection throttling mechanisms to prevent rapid successive requests that could accelerate memory exhaustion.