CVE-2000-0584 in Input System
Summary
by MITRE
Buffer overflow in Canna input system allows remote attackers to execute arbitrary commands via an SR_INIT command with a long user name or group name.
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Analysis
by VulDB Data Team • 12/09/2024
The CVE-2000-0584 vulnerability represents a critical buffer overflow flaw within the Canna input system, a Japanese input method system widely used in Unix and Linux environments. This vulnerability specifically targets the SR_INIT command implementation where the system fails to properly validate the length of user name and group name parameters. The flaw exists in the way the system processes incoming network requests, particularly when handling authentication and session initialization commands. Attackers can exploit this weakness by crafting malicious SR_INIT commands with excessively long user name or group name strings that exceed the allocated buffer space, causing a buffer overflow condition.
The technical implementation of this vulnerability stems from inadequate input validation and boundary checking within the Canna server's network protocol handler. When the system receives an SR_INIT command with oversized parameters, the fixed-length buffers used to store user and group identifiers overflow into adjacent memory regions, potentially corrupting critical system data structures or executable code. This type of buffer overflow vulnerability falls under the common weakness enumeration CWE-121, which specifically addresses stack-based buffer overflow conditions. The vulnerability is particularly dangerous because it allows for remote code execution without requiring authentication, making it a prime target for automated exploitation.
The operational impact of this vulnerability extends far beyond simple denial of service scenarios, as it provides attackers with the capability to execute arbitrary commands on affected systems with the privileges of the Canna service. This remote code execution capability enables attackers to gain full control over the affected system, potentially leading to complete compromise of the host and subsequent lateral movement within the network. The vulnerability affects systems running the Canna input system in networked environments where the SR_INIT command is accessible over the network, making it particularly dangerous in multi-user or multi-tenant environments. According to ATT&CK framework, this vulnerability maps to T1059.007 for remote command execution and T1203 for exploitation for privilege escalation.
Mitigation strategies for CVE-2000-0584 should include immediate patching of the Canna input system to address the buffer overflow condition through proper input validation and boundary checking. System administrators should implement network segmentation and access controls to limit exposure of the Canna service to untrusted networks, utilizing firewalls to block unnecessary network access to the affected ports. Additionally, monitoring and logging should be enhanced to detect anomalous SR_INIT command patterns that might indicate exploitation attempts. The vulnerability highlights the importance of input validation and proper memory management in network services, demonstrating how seemingly simple protocol implementations can create significant security risks when proper bounds checking is omitted. Organizations should also consider implementing intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability pattern.