CVE-2000-0989 in InBusiness eMail Station
Summary
by MITRE
Buffer overflow in Intel InBusiness eMail Station 1.04.87 POP service allows remote attackers to cause a denial of service and possibly execute commands via a long username.
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Analysis
by VulDB Data Team • 09/18/2024
The vulnerability identified as CVE-2000-0989 represents a critical buffer overflow flaw within the Intel InBusiness eMail Station 1.04.87 POP service implementation. This security weakness specifically manifests in the handling of user authentication requests where the system fails to properly validate the length of incoming username data. The flaw occurs when a remote attacker crafts a maliciously long username string that exceeds the allocated buffer space, causing the application to overwrite adjacent memory segments. Such buffer overflow conditions are particularly dangerous as they can lead to unpredictable application behavior and potentially allow for arbitrary code execution. The vulnerability resides in the protocol handling layer of the email server software, making it accessible to any attacker with network connectivity to the affected service.
The technical implementation of this buffer overflow stems from inadequate input validation mechanisms within the POP3 service component of the Intel InBusiness eMail Station. When the system processes authentication requests, it does not enforce proper bounds checking on username length parameters, allowing attackers to supply excessively long strings that surpass the predefined buffer limits. This particular implementation flaw aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking permits memory corruption. The vulnerability is classified as a remote attack vector since no local access or authentication is required to exploit the flaw, making it particularly dangerous for networked environments. The POP3 protocol service is especially susceptible due to its role in handling user credentials and the predictable nature of authentication request processing.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable remote code execution capabilities. While the primary effect may manifest as service disruption and system instability, the underlying buffer overflow condition creates opportunities for attackers to inject malicious code into the target system memory. This represents a significant threat to email server availability and can compromise the entire email infrastructure if exploited successfully. The vulnerability affects organizations relying on Intel InBusiness eMail Station 1.04.87, particularly those with exposed POP3 services on their network perimeters. Attackers could leverage this flaw to gain unauthorized access to email accounts, potentially leading to data breaches, email spoofing, or further network infiltration attempts.
Organizations must implement immediate remediation measures to address this vulnerability including applying the vendor-provided security patches, disabling unnecessary POP3 services, and implementing network segmentation to limit exposure. The recommended mitigation strategies align with standard security practices outlined in the mitre attack framework where such buffer overflow vulnerabilities are categorized under initial access and execution phases. Network administrators should also consider implementing intrusion detection systems to monitor for suspicious authentication patterns and malformed username requests. Additionally, regular security assessments and vulnerability scanning should be conducted to identify similar flaws in other email server implementations. The incident underscores the importance of proper input validation and bounds checking in network service applications, particularly those handling authentication credentials. Organizations should also review their software update policies to ensure timely patch deployment for critical vulnerabilities, as this flaw demonstrates the persistent nature of security issues in legacy email server implementations.