CVE-1999-0190 in Solaris
Summary
by MITRE
Solaris rpcbind can be exploited to overwrite arbitrary files and gain root access.
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Analysis
by VulDB Data Team • 04/17/2026
The vulnerability identified as CVE-1999-0190 represents a critical security flaw in Solaris rpcbind service that fundamentally compromises system integrity and privilege escalation capabilities. This issue affects the rpcbind daemon which is responsible for managing Remote Procedure Call binding services in Solaris operating systems. The vulnerability stems from improper input validation and file handling mechanisms within the rpcbind service that processes requests from remote clients. Attackers can exploit this weakness to manipulate file operations and potentially execute arbitrary code with root privileges.
The technical implementation of this vulnerability involves a buffer overflow or file manipulation flaw that occurs when rpcbind processes specific network requests containing maliciously crafted data. When the service receives input that exceeds expected parameters or contains malformed file paths, it fails to properly validate or sanitize these inputs before performing file system operations. This allows attackers to overwrite critical system files or create malicious files with elevated privileges, effectively bypassing normal access controls and privilege boundaries. The flaw operates at the kernel or system service level where rpcbind runs with elevated privileges, making the exploitation particularly dangerous.
The operational impact of CVE-1999-0190 extends far beyond simple privilege escalation as it provides attackers with complete system compromise capabilities. Once an attacker gains root access through this vulnerability, they can establish persistent backdoors, modify system binaries, access confidential data, and potentially use the compromised system as a launch point for further attacks within a network. The vulnerability affects systems running Solaris versions that include the vulnerable rpcbind service, making it particularly concerning for enterprise environments where Solaris servers are commonly deployed for critical services. Network-based attacks can be executed without requiring prior authentication, making the exploit particularly dangerous in unsecured network environments.
Mitigation strategies for this vulnerability require immediate patching of affected Solaris systems with the appropriate security updates provided by Sun Microsystems. Organizations should implement network segmentation to limit access to rpcbind services and disable unnecessary rpcbind functionality when possible. The principle of least privilege should be enforced by running rpcbind with minimal required permissions and monitoring for suspicious file operations. System administrators should implement intrusion detection systems that can identify anomalous rpcbind behavior and network traffic patterns associated with exploitation attempts. Additionally, regular security assessments and vulnerability scanning should be conducted to identify similar issues in other system services that may present analogous security risks. This vulnerability aligns with CWE-121 and CWE-122 categories related to buffer overflow conditions and improper input validation, and represents a classic example of privilege escalation techniques documented in the MITRE ATT&CK framework under privilege escalation tactics.
The broader implications of this vulnerability highlight the critical importance of secure coding practices in system-level services and the potential for seemingly minor input validation flaws to create catastrophic security breaches. Legacy Solaris systems remain vulnerable to such attacks, emphasizing the need for comprehensive security maintenance and the importance of keeping operating systems current with security patches. Organizations should also implement comprehensive monitoring and logging of rpcbind activities to detect exploitation attempts and establish incident response procedures specifically addressing this class of vulnerability.