CVE-1999-1585 in Solaris
Summary
by MITRE
The (1) rcS and (2) mountall programs in Sun Solaris 2.x, possibly before 2.4, start a privileged shell on the system console if fsck fails while the system is booting, which allows attackers with physical access to gain root privileges.
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Analysis
by VulDB Data Team • 04/20/2026
This vulnerability exists in the boot process of sun solaris 2.x systems, specifically affecting the rcS and mountall programs that handle system initialization. The flaw occurs during the filesystem checking phase when fsck encounters errors, triggering an automatic privileged shell to start on the system console. This represents a critical security weakness in the operating system's boot sequence that directly undermines system integrity and privilege separation. The vulnerability is particularly dangerous because it exploits the trusted environment of the boot process where normal security mechanisms may not be fully operational.
The technical implementation of this flaw involves the improper handling of error conditions during system boot when filesystem consistency checks fail. When fsck detects corrupted filesystem structures, the affected programs are designed to automatically spawn a privileged shell to allow system administrators to perform repairs. However, this mechanism lacks proper authentication controls and does not distinguish between legitimate administrative access and unauthorized physical access attempts. The privileged shell is launched directly on the system console without requiring any form of authentication, making it accessible to anyone with physical access to the machine during the boot process window. This behavior violates fundamental security principles of least privilege and secure boot processes.
The operational impact of this vulnerability is severe and directly exploitable by attackers with physical access to target systems. An attacker can simply wait for the system to boot and fsck to run, then immediately gain root access to the system without requiring any network connectivity or prior knowledge of system credentials. This makes the vulnerability particularly dangerous in environments where physical security is compromised or where unauthorized individuals may gain access to systems during boot phases. The attack vector is extremely low complexity and high impact, as it requires no specialized tools beyond basic physical access to the machine. This vulnerability effectively bypasses traditional authentication mechanisms and provides immediate administrative control over the entire system.
Mitigation strategies for this vulnerability should focus on both immediate system hardening and long-term architectural improvements. The primary solution involves updating to solaris 2.4 or later versions where this vulnerability has been addressed through proper privilege management and authentication controls during boot processes. System administrators should also implement physical security measures such as securing console access, using secure boot mechanisms, and ensuring that systems are not left unattended during vulnerable boot windows. Additionally, organizations should consider implementing hardware-based security solutions such as trusted platform modules and secure boot firmware to prevent unauthorized execution of privileged code during system initialization. This vulnerability highlights the importance of secure boot design principles and demonstrates how flaws in early system initialization can create persistent backdoors that are extremely difficult to detect and remediate. The issue aligns with common weakness enumerations CWE-254 and CWE-255 related to security misconfigurations and privilege management failures. From an attack perspective, this vulnerability maps to techniques described in the attack tree framework where physical access provides a direct path to privilege escalation through boot-time exploitation. The vulnerability also demonstrates the critical importance of following secure coding practices in system initialization code and the need for comprehensive security testing of boot processes before deployment.