CVE-2019-0057 in Junos
Summary
by MITRE
An improper authorization weakness in Juniper Networks Junos OS allows a local authenticated attacker to bypass regular security controls to access the Junos Device Manager (JDM) application and take control of the system. This issue affects: Juniper Networks Junos OS versions prior to 18.2R1, 18.2X75-D5.
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Analysis
by VulDB Data Team • 01/05/2024
The vulnerability identified as CVE-2019-0057 represents a critical authorization flaw within Juniper Networks Junos OS operating systems, specifically impacting versions prior to 18.2R1 and 18.2X75-D5. This weakness resides in the Junos Device Manager application, which serves as a critical interface for system administration and configuration management. The flaw allows an attacker who has already established local authentication credentials to bypass normal security controls that would typically restrict access to the JDM application. This represents a significant escalation of privileges from a local authenticated position to system control, undermining fundamental security boundaries that should separate administrative functions from regular user access.
The technical implementation of this vulnerability stems from inadequate authorization checks within the Junos OS security framework. When a local user authenticates to the system, the operating system should enforce strict access controls that prevent unauthorized access to privileged administrative interfaces. However, in affected versions, these controls fail to properly validate the user's authorization level before granting access to the Junos Device Manager. This misconfiguration creates a path where legitimate authenticated users can bypass standard security controls and gain access to administrative functions that should be restricted to authorized administrators only. The flaw operates at the application level within the operating system's privilege management mechanisms, making it particularly dangerous as it can be exploited by users who already have some level of system access.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it provides attackers with complete control over the affected Junos OS devices. Once an attacker gains access through this vulnerability, they can manipulate network configurations, modify security policies, access sensitive data, and potentially use the compromised device as a pivot point for attacking other systems within the network. This vulnerability directly violates the principle of least privilege and can enable attackers to establish persistent access to network infrastructure, making it a prime target for both malicious actors seeking to compromise network security and threat actors conducting reconnaissance and lateral movement activities. The vulnerability affects network infrastructure devices that are often considered critical to organizational security, making its exploitation particularly concerning for enterprise and service provider environments.
Organizations affected by CVE-2019-0057 should prioritize immediate remediation through the application of Juniper's security patches and updates. The vulnerability aligns with CWE-284, which describes improper access control issues, and represents a clear violation of the principle of least privilege in security architecture. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and lateral movement, as attackers can use it to gain administrative access and then move through the network. Security teams should conduct comprehensive audits of their Junos OS deployments to identify all affected devices and implement network segmentation to limit the potential impact. Additionally, monitoring for unusual access patterns and authentication attempts should be enhanced, as this vulnerability could be exploited to establish covert administrative access that might evade normal security controls. The remediation process should include not only patching but also verification of access controls and implementation of additional monitoring measures to detect potential exploitation attempts.