CVE-2000-0060 in Rover
Summary
by MITRE
Buffer overflow in aVirt Rover POP3 server 1.1 allows remote attackers to cause a denial of service via a long user name.
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Analysis
by VulDB Data Team • 10/19/2025
The vulnerability identified as CVE-2000-0060 represents a classic buffer overflow flaw within the aVirt Rover POP3 server version 1.1, specifically affecting the handling of user authentication credentials during the POP3 protocol interaction. This type of vulnerability falls under the Common Weakness Enumeration category CWE-121, which encompasses buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The flaw manifests when the server receives a maliciously crafted user name that exceeds the allocated buffer size during the authentication process, creating an exploitable condition that can be leveraged remotely by attackers without requiring any authentication credentials.
The technical implementation of this vulnerability occurs during the POP3 protocol negotiation phase when the server processes the USER command sent by a client. The aVirt Rover POP3 server fails to properly validate the length of the user name parameter before copying it into a fixed-size buffer, resulting in a classic stack-based buffer overflow condition. When an attacker sends a specially crafted user name string that exceeds the buffer capacity, the excess data overflows into adjacent memory locations, potentially corrupting the stack frame and executable code. This overflow can cause the server process to crash or behave unpredictably, leading to the denial of service condition that constitutes the primary impact of this vulnerability.
The operational impact of CVE-2000-0060 extends beyond simple service disruption as it represents a fundamental security weakness that could potentially be exploited for more severe attacks. While the immediate effect is a denial of service that prevents legitimate users from accessing their email accounts through the affected POP3 server, the buffer overflow condition creates opportunities for more sophisticated exploitation techniques. Attackers could potentially manipulate the overflow to redirect program execution flow or inject malicious code, particularly if the server environment lacks modern security protections such as stack canaries, address space layout randomization, or non-executable stack protections. The vulnerability affects organizations that rely on the aVirt Rover POP3 server for email services, potentially compromising email availability and integrity for their users.
Mitigation strategies for this vulnerability require immediate attention through software updates and system hardening measures. The most effective solution involves upgrading to a patched version of the aVirt Rover POP3 server that properly implements bounds checking for user name inputs and includes robust input validation mechanisms. Organizations should also implement network segmentation and access controls to limit exposure to the affected server, particularly by restricting POP3 access to trusted networks and implementing firewall rules that monitor for suspicious user name lengths. Additionally, system administrators should consider implementing intrusion detection systems that can identify anomalous POP3 traffic patterns and deploy application-level firewalls that can filter out malformed user name parameters before they reach the vulnerable server components. The vulnerability also highlights the importance of following secure coding practices and conducting regular security assessments to identify and remediate similar buffer overflow conditions in legacy applications.