CVE-2000-0026 in UnixWare
Summary
by MITRE
Buffer overflow in UnixWare i2odialogd daemon allows remote attackers to gain root access via a long username/password authorization string.
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Analysis
by VulDB Data Team • 01/13/2025
The vulnerability described in CVE-2000-0026 represents a critical buffer overflow flaw within the UnixWare i2odialogd daemon, a component designed to handle authentication requests for certain network services. This daemon operates as a privileged process running with root privileges, making it an attractive target for attackers seeking to escalate their access within the system. The buffer overflow occurs specifically when processing authentication credentials, where the daemon fails to properly validate the length of incoming username and password strings, leading to memory corruption that can be exploited by remote adversaries.
The technical implementation of this vulnerability stems from improper input validation within the i2odialogd daemon's authentication handling mechanism. When a remote attacker sends an authentication request containing an excessively long username or password string, the daemon's buffer allocation does not account for the overflow condition, resulting in adjacent memory locations being overwritten. This memory corruption can be manipulated to overwrite critical program control structures such as return addresses or function pointers, enabling attackers to redirect execution flow and ultimately execute arbitrary code with root privileges. The vulnerability is classified as a classic stack-based buffer overflow, which aligns with CWE-121 and CWE-122 categories, representing weaknesses in buffer management and input validation.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete system compromise capabilities. Once an attacker successfully exploits this buffer overflow, they gain root access to the affected UnixWare system, allowing them to modify system files, install backdoors, extract sensitive data, or establish persistent access. The remote nature of the attack means that adversaries can exploit this vulnerability without requiring physical access to the system, making it particularly dangerous in networked environments where UnixWare systems may be exposed to untrusted networks. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1068 for local privilege escalation and T1566 for initial access through remote services.
Mitigation strategies for this vulnerability require immediate patching of the affected UnixWare systems, as the original vendor released security updates to address the buffer overflow in the i2odialogd daemon. Organizations should also implement network segmentation to limit access to systems running this daemon, disable unnecessary network services, and monitor for suspicious authentication attempts that might indicate exploitation attempts. Additional defensive measures include implementing proper input validation at network boundaries, using intrusion detection systems to monitor for long string patterns in authentication traffic, and conducting regular security assessments to identify similar vulnerabilities in other system components. The vulnerability demonstrates the critical importance of proper input validation and memory management in privileged network services, highlighting the need for robust software security practices throughout the development lifecycle to prevent similar issues from occurring in other system components.