CVE-2020-1623 in Junos
Summary
by MITRE
A local, authenticated user with shell can view sensitive configuration information via the ev.ops configuration file. This issue affects all versions of Junos OS Evolved prior to 19.2R1.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 05/17/2024
The vulnerability identified as CVE-2020-1623 represents a critical information disclosure flaw within Junos OS Evolved systems that affects all versions prior to 19.2R1. This issue arises from improper access controls and file permissions that allow authenticated local users with shell access to directly read sensitive configuration data from the ev.ops configuration file. The vulnerability specifically targets the operational aspects of the Junos OS Evolved platform, which is designed for modern network infrastructure deployments and cloud environments. The ev.ops file contains critical system configuration parameters that should remain protected from unauthorized access, making this a significant security concern for network administrators and security professionals managing these platforms.
The technical exploitation of this vulnerability occurs through a local privilege escalation pathway where an authenticated user with shell access can directly access the ev.ops configuration file without proper authorization checks. This flaw stems from inadequate file permission controls and access validation mechanisms within the Junos OS Evolved architecture. The ev.ops file typically contains operational parameters, system settings, and potentially sensitive configuration data that could reveal system internals, network topology information, or other operational details that should remain confidential. This type of vulnerability falls under the CWE-276 category of Incorrect Permission Assignment for Critical Resources, which specifically addresses scenarios where system resources are not properly protected from unauthorized access. The vulnerability demonstrates poor security by design principles where sensitive operational files are not adequately protected through proper access control mechanisms.
The operational impact of CVE-2020-1623 extends beyond simple information disclosure, as the sensitive data exposed through the ev.ops file could enable further attacks or provide adversaries with valuable intelligence for targeting the affected systems. Network administrators who rely on Junos OS Evolved for their infrastructure may find that this vulnerability compromises the security posture of their entire network environment, as the exposed configuration data could reveal network architecture details, system configurations, or operational parameters that could be leveraged by malicious actors. The vulnerability affects organizations running Junos OS Evolved versions before 19.2R1, which represents a significant portion of deployed systems that may have been overlooked during security assessments. This issue aligns with ATT&CK technique T1005 for Data from Local System, where adversaries gather information from compromised systems. The exposure of operational configuration data could also facilitate more sophisticated attacks including privilege escalation, lateral movement, or targeted exploitation of other system components that rely on the exposed information.
Organizations affected by this vulnerability should immediately implement the remediation measures provided by Juniper Networks, which includes upgrading to Junos OS Evolved 19.2R1 or later versions that contain the necessary patches to address the improper file access controls. Security teams should also conduct comprehensive audits of their Junos OS Evolved deployments to identify any systems running vulnerable versions and ensure that proper access controls are implemented for all operational configuration files. The mitigation strategy should include implementing principle of least privilege for shell access, monitoring for unauthorized file access attempts, and ensuring that all operational configuration files are properly secured with appropriate file permissions. Additionally, organizations should consider implementing automated security scanning tools that can detect and alert on improper file access patterns, as this vulnerability could be exploited in conjunction with other attack vectors to compromise system integrity and confidentiality. The vulnerability serves as a reminder of the critical importance of proper access control implementation and the need for continuous security assessment of operational systems.