CVE-1999-0502 in Solaris
Prediction
by VulDB Data Team • 04/17/2026
A vulnerability was determined in Sun Solaris 2.5.1/2.6/7.0/8.0. The affected element is an unknown function of the component Authentication. Executing a manipulation of the argument Password can lead to improper authentication. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized. Updating the configuration settings is suggested.
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Analysis
by VulDB Data Team • 04/17/2026
This vulnerability represents a fundamental authentication weakness in unix systems where user accounts are configured with null, blank, or missing passwords, creating an easily exploitable security gap that violates core principles of access control and system integrity. The issue stems from improper account configuration during system initialization or user management processes, where administrative oversight or automated deployment scripts fail to enforce strong password policies. This weakness allows unauthorized users to gain system access without providing any authentication credentials, effectively bypassing the entire authentication mechanism. The vulnerability is classified as a direct violation of cwe-256, which addresses weak password policies, and aligns with attack techniques described in the attack pattern taxonomy under credential access categories. Systems affected by this vulnerability are particularly at risk in environments where default accounts are not properly secured or where legacy configurations persist without proper security hardening.
The technical implementation of this flaw occurs at the authentication layer where unix systems typically rely on password validation mechanisms to verify user identity. When an account possesses a null or blank password, the system accepts any login attempt without requiring credential verification, creating an open door for malicious actors. This vulnerability operates at the operating system level and affects all authentication methods that depend on password validation, including ssh, telnet, and local console access. The flaw is particularly dangerous because it requires no specialized tools or techniques to exploit, making it a preferred target for initial access in penetration testing scenarios and automated attack frameworks. The absence of password requirements creates a persistent security risk that remains active until explicitly addressed through password enforcement or account disabling mechanisms.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as it provides attackers with a foundation for further compromise within the system. Once an attacker gains access through a null password account, they can escalate privileges, exfiltrate sensitive data, or establish persistent backdoors using the compromised account as a foothold. This vulnerability directly undermines the principle of least privilege and can lead to complete system compromise when combined with other weaknesses. The risk is amplified in multi-user environments where default accounts like root, daemon, or guest accounts may retain null passwords, providing attackers with multiple potential entry points. Security monitoring systems may fail to detect these unauthorized accesses because they appear as legitimate login attempts, making the vulnerability particularly stealthy and difficult to trace. Organizations with multiple unix systems or legacy deployments are especially vulnerable, as default configurations often remain unaddressed during system maintenance or upgrades.
Mitigation strategies for this vulnerability require immediate implementation of password enforcement policies and comprehensive system auditing procedures. System administrators must conduct regular security assessments to identify accounts with null or blank passwords and enforce mandatory password changes for all user accounts. The implementation of strong password policies, including complexity requirements and regular password rotation, should be enforced through system configuration files and authentication modules. Security frameworks such as the nist cybersecurity framework recommend implementing robust access control measures that include mandatory credential requirements and automated account monitoring. Additional protective measures include disabling default accounts, implementing account lockout mechanisms, and configuring automated systems to detect and alert on null password conditions. Organizations should also establish regular security training programs to prevent administrative oversights and ensure proper account management procedures are followed. The remediation process must include comprehensive testing to verify that all accounts require valid authentication credentials and that system configurations comply with established security baselines.