CVE-1999-0977 in Solaris
Summary
by MITRE
Buffer overflow in Solaris sadmind allows remote attackers to gain root privileges using a NETMGT_PROC_SERVICE request.
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Analysis
by VulDB Data Team • 10/21/2025
The vulnerability described in CVE-1999-0977 represents a critical buffer overflow flaw within the Solaris sadmind service, which operates as part of the Solaris Administration Daemon framework. This daemon provides remote administration capabilities for Solaris systems and is particularly vulnerable due to its handling of the NETMGT_PROC_SERVICE request type. The flaw exists in the way the service processes incoming network requests, specifically when parsing data structures associated with process management operations. This vulnerability was particularly concerning because it allowed remote attackers to execute arbitrary code with the highest privileges available on the system, effectively providing complete system compromise without requiring any authentication credentials.
The technical implementation of this buffer overflow stems from inadequate input validation within the sadmind service's network processing routines. When a NETMGT_PROC_SERVICE request is received, the service fails to properly bounds-check the length of incoming data before copying it into fixed-size buffers within the program's memory space. This classic buffer overflow condition occurs because the application assumes that incoming data will not exceed predetermined limits, but attackers can craft specially formatted requests that exceed these buffer capacities. The overflow typically occurs in memory regions that control program execution flow, allowing malicious data to overwrite critical program variables including return addresses or function pointers. This vulnerability maps directly to CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios, both of which are common attack vectors in system administration services.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it provides attackers with complete control over affected Solaris systems. Once successfully exploited, attackers can execute commands as the root user, which means they can modify system files, create new user accounts, install backdoors, and access all system resources without detection. This vulnerability particularly affects Solaris versions prior to the security patches released in 1999, making it a significant concern for organizations running older Solaris installations. The remote nature of the attack means that exploitation does not require physical access to the system, and attackers can leverage network-based scanning tools to identify vulnerable systems. This vulnerability aligns with ATT&CK technique T1068 which covers exploit for privilege escalation, and T1566 which describes social engineering attacks that could be used to deliver malicious requests to vulnerable services. The impact is particularly severe because sadmind services are often enabled by default on Solaris systems, making them prime targets for automated exploitation campaigns.
Mitigation strategies for CVE-1999-0977 require immediate implementation of security patches provided by Sun Microsystems, which addressed the buffer overflow by implementing proper input validation and bounds checking mechanisms. Organizations should disable the sadmind service entirely if remote administration is not required, as this eliminates the attack surface entirely. Network segmentation and firewall rules should be implemented to restrict access to the sadmind service ports, typically port 512 for the service itself and related ports for administration functions. System administrators should also implement regular security audits to identify and disable unnecessary services, following the principle of least privilege. Additional protective measures include monitoring network traffic for suspicious requests to the sadmind service, implementing intrusion detection systems that can identify malformed NETMGT_PROC_SERVICE requests, and maintaining up-to-date vulnerability assessments to identify similar flaws in other system administration services. The vulnerability demonstrates the importance of proper input validation in network services and the critical need for regular security updates, particularly for system administration tools that operate with elevated privileges.