CVE-1999-1507 in SunOS
Summary
by MITRE
sun sunos 4.1 through 4.1.3 allows local attackers to gain root access via insecure permissions on files and directories such as crash.
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Analysis
by VulDB Data Team • 06/23/2021
The vulnerability described in CVE-1999-1507 represents a critical privilege escalation flaw affecting Sun Solaris 4.1 through 4.1.3 operating systems. This issue stems from insecure file permissions that allow local attackers to gain root access to the system. The vulnerability specifically targets the crash directory and related system files, which were configured with overly permissive access controls that should have been restricted to administrative users only. This misconfiguration creates a path for unauthorized local users to escalate their privileges and obtain root-level system access, fundamentally compromising the security posture of affected systems.
The technical flaw manifests through improper permission settings on critical system directories and files, particularly the crash directory that contains system crash information and related debugging data. Under normal circumstances, such directories should be accessible only to root or system administrators, but in vulnerable versions of Solaris 4.1, these directories were configured with world-readable and world-writable permissions. This configuration allows any local user to modify system files, potentially leading to code execution with elevated privileges. The flaw operates at the operating system kernel level, where file system permissions are not properly enforced, creating a direct pathway for privilege escalation attacks.
From an operational impact perspective, this vulnerability presents a severe threat to system integrity and confidentiality. Local attackers who can exploit this vulnerability gain complete control over the affected system, enabling them to access all stored data, modify system configurations, install malicious software, and potentially use the compromised system as a launch point for attacks against other networked systems. The vulnerability is particularly dangerous because it requires minimal privileges to exploit, making it accessible to any user who can log into the system locally. This characteristic aligns with attack patterns classified under the MITRE ATT&CK framework's privilege escalation tactics, specifically targeting the 'Local Privilege Escalation' technique. The vulnerability also relates to CWE-276, which describes improper file permissions that allow unauthorized access to system resources.
Mitigation strategies for this vulnerability involve immediate implementation of proper file system permission controls on system directories, particularly those related to crash handling and system debugging. System administrators should ensure that sensitive directories like crash are configured with restrictive permissions, typically limiting access to root only. The recommended fix includes setting appropriate ownership and permissions for system directories, ensuring that no user accounts have unnecessary write access to critical system files. Additionally, regular security audits should verify that system configurations align with security best practices, and monitoring should be implemented to detect unauthorized modifications to system directories. This vulnerability highlights the fundamental importance of proper access control implementation and demonstrates how seemingly minor permission misconfigurations can create significant security risks, particularly in enterprise environments where multiple users may have local access to critical systems.