CVE-1999-1034 in SVR4
Summary
by MITRE
vulnerability in login in at&t system v release 4 allows local users to gain privileges.
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Analysis
by VulDB Data Team • 06/23/2021
The vulnerability described in CVE-1999-1034 represents a critical privilege escalation flaw within the ATT System V Release 4 login mechanism. This issue stems from improper privilege handling during the authentication process, specifically allowing local users to elevate their system access rights without proper authorization. The vulnerability affects the core authentication subsystem of the operating system, making it a fundamental security weakness that could compromise entire system integrity. The flaw exists in the way the login program manages user privileges and system access controls during the authentication sequence, creating an exploitable path for unauthorized privilege elevation.
This vulnerability operates through a well-defined technical mechanism that exploits the trust relationship between the login program and the system's privilege management framework. The flaw allows local users to manipulate the authentication flow and bypass normal access controls that should prevent privilege escalation. The issue is particularly dangerous because it does not require network access or external exploitation methods, making it easily accessible to any user with local system access. The technical implementation involves improper validation of user credentials and system state checks that should normally prevent unauthorized privilege elevation, creating a direct pathway for local attackers to gain elevated system rights. This aligns with CWE-276, which addresses improper privileges, and represents a classic case of insufficient privilege checking in authentication mechanisms.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and data exposure. Local users who exploit this vulnerability can gain root or administrative privileges, enabling them to modify system files, install malicious software, access sensitive data, and potentially establish persistent backdoors. The attack vector is particularly concerning because it requires minimal skill and provides maximum impact, making it attractive to both malicious actors and system administrators who might exploit it for unauthorized access. The vulnerability affects the fundamental security model of the system, as it undermines the basic principle that local access should not automatically translate to elevated privileges, creating a significant risk to system confidentiality, integrity, and availability. This vulnerability also impacts the system's ability to maintain proper audit trails and access controls, as the authentication process becomes unreliable.
Mitigation strategies for CVE-1999-1034 should focus on immediate system hardening and access control enforcement. The primary recommendation involves applying vendor patches or updates that correct the privilege handling mechanism in the login program, ensuring that proper access controls are maintained during authentication. System administrators should implement strict local access controls, disable unnecessary local accounts, and regularly audit system access logs for suspicious privilege escalation attempts. The solution must address the root cause by modifying how the login program validates user credentials and manages system privileges, preventing the bypass of normal access controls. Organizations should also implement monitoring systems to detect unauthorized privilege escalation attempts and establish proper incident response procedures for handling such security events. This vulnerability demonstrates the importance of maintaining secure authentication mechanisms and proper privilege separation, aligning with ATT&CK technique T1068 which covers privilege escalation through local exploit techniques. The fix should ensure that the login process properly enforces the principle of least privilege and maintains proper access control enforcement throughout the authentication workflow.