CVE-2001-0681 in NET
Summary
by MITRE
Buffer overflow in ftpd in QPC QVT/Net 5.0 and QVT/Term 5.0 allows a remote attacker to cause a denial of service via a long (1) username or (2) password.
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Analysis
by VulDB Data Team • 05/26/2019
The vulnerability identified as CVE-2001-0681 represents a critical buffer overflow flaw within the ftpd component of QPC QVT/Net 5.0 and QVT/Term 5.0 software products. This issue manifests when the system processes user authentication credentials, specifically targeting the username and password input fields during ftp protocol interactions. The buffer overflow occurs due to inadequate input validation and bounds checking mechanisms within the ftpd service implementation, creating a scenario where maliciously crafted input can exceed the allocated memory buffer space. Such vulnerabilities fall under the common weakness enumeration CWE-121, which categorizes buffer overflow conditions as fundamental software design flaws that can lead to system instability and potential exploitation. The attack vector is particularly concerning as it operates over the network, allowing remote adversaries to exploit the flaw without requiring physical access to the target system.
The technical exploitation of this vulnerability enables attackers to craft specially formatted username and password inputs that exceed the predefined buffer limits. When the ftpd service processes these oversized inputs, the excess data overflows into adjacent memory regions, potentially corrupting critical system data structures or even executing arbitrary code. The denial of service outcome occurs when the overflow corrupts the service's memory management structures, causing the ftpd process to crash or become unresponsive. This type of vulnerability demonstrates characteristics consistent with CWE-787, which describes out-of-bounds write conditions where data is written beyond the boundaries of allocated buffers. The impact extends beyond simple service disruption as the vulnerability may provide a foothold for more sophisticated attacks that leverage memory corruption to gain elevated privileges or execute malicious payloads.
The operational impact of CVE-2001-0681 significantly affects organizations relying on QPC QVT/Net and QVT/Term products for their file transfer operations. Network administrators face the risk of unauthorized service disruption, which can compromise business continuity and data availability. The vulnerability's remote exploitability means that attackers can target systems from anywhere on the network, making it particularly dangerous for organizations with exposed ftp services. This flaw represents a critical security gap that violates fundamental security principles outlined in the MITRE ATT&CK framework under the T1499 category for network denial of service attacks. The vulnerability's exploitation can lead to complete service unavailability, forcing organizations to implement emergency patches or service interruptions while mitigations are deployed. Organizations using these legacy systems face additional challenges as the software is no longer actively supported, making remediation more complex and potentially requiring complete system replacement.
Mitigation strategies for CVE-2001-0681 should prioritize immediate patching of affected systems with vendor-supplied security updates or complete replacement of the vulnerable software. Network segmentation and access controls can provide temporary protection by limiting exposure of ftp services to trusted networks only. Implementing input validation measures at network boundaries, such as firewalls with deep packet inspection capabilities, can help detect and block malicious input patterns before they reach the vulnerable ftpd service. Regular security assessments and vulnerability scanning should be conducted to identify similar buffer overflow vulnerabilities in other network services. The remediation process should also include monitoring for exploitation attempts and establishing incident response procedures to quickly address any successful attacks. Organizations should consider migrating to modern, supported ftp implementations that follow current security standards and incorporate proper buffer management techniques. The vulnerability serves as a reminder of the importance of maintaining up-to-date security patches and the risks associated with running legacy software systems that lack vendor support and security updates.