CVE-2017-2341 in Junos
Summary
by MITRE
An insufficient authentication vulnerability on platforms where Junos OS instances are run in a virtualized environment, may allow unprivileged users on the Junos OS instance to gain access to the host operating environment, and thus escalate privileges. Affected releases are Juniper Networks Junos OS 14.1X53 prior to 14.1X53-D40 on QFX5110, QFX5200, QFX10002, QFX10008, QFX10016, EX4600 and NFX250; 15.1 prior to 15.1R5 on EX4600; 15.1X49 prior to 15.1X49-D70 on vSRX, SRX1500, SRX4100, SRX4200; 16.1 prior to 16.1R2 on EX4600, ACX5000 series. This issue does not affect vMX. No other Juniper Networks products or platforms are affected by this issue.
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Analysis
by VulDB Data Team • 01/01/2021
This vulnerability represents a critical privilege escalation flaw in Juniper Networks Junos OS running within virtualized environments, specifically affecting certain hardware platforms and software versions. The issue stems from inadequate authentication mechanisms that fail to properly validate user credentials when operating in virtualized contexts, creating a pathway for unprivileged local users to bypass security controls and gain access to the underlying host operating system. This represents a fundamental breakdown in the isolation boundaries that should exist between virtual machine instances and their host environments, potentially allowing malicious actors to escalate privileges from standard user level to system-level access.
The technical flaw manifests through insufficient authentication checks that are particularly problematic in virtualized deployments where multiple instances may share underlying physical resources. When Junos OS instances operate in virtualized environments such as those found on QFX series switches and EX4600 platforms, the authentication mechanisms fail to properly enforce access controls between the virtual instance and the host operating system. This vulnerability specifically impacts platforms where the virtualization layer does not adequately enforce the security boundaries that should prevent unauthorized access to host resources. The flaw allows for privilege escalation that can result in complete system compromise, as the authenticated user can potentially access sensitive host-level information, execute arbitrary code, and manipulate system resources.
The operational impact of this vulnerability is severe and multifaceted, particularly for network infrastructure devices running affected Junos OS versions. Organizations utilizing affected QFX series switches, EX4600 devices, and specific SRX platform models face significant risk of unauthorized access to their network infrastructure. The vulnerability can enable attackers to gain root-level access to the host operating system, potentially allowing them to modify network configurations, access sensitive data, or establish persistent backdoors within the network infrastructure. This risk is particularly concerning given that the affected platforms are often deployed at critical points within enterprise networks, where they control network traffic and access policies. The vulnerability affects multiple product lines including QFX5110, QFX5200, QFX10002, QFX10008, QFX10016, EX4600, and various SRX series devices, creating widespread potential impact across different network segments.
Security controls for this vulnerability align with the principles outlined in the MITRE ATT&CK framework under privilege escalation techniques, specifically targeting the use of software vulnerabilities to gain higher-level permissions. The vulnerability maps to CWE-287 which addresses improper authentication issues in software systems, highlighting the fundamental flaw in how authentication is handled within the virtualized Junos OS environment. Organizations should implement immediate mitigations including applying the relevant security patches provided by Juniper Networks for the affected software versions, as well as implementing network segmentation and monitoring to detect anomalous access patterns. Additionally, security teams should conduct comprehensive vulnerability assessments to identify all affected devices within their infrastructure and establish monitoring procedures for unauthorized access attempts. The remediation process should include thorough testing of patched versions to ensure that the authentication mechanisms function correctly without introducing new operational issues. Given that this vulnerability specifically affects virtualized environments, organizations should also review their virtualization security configurations and ensure that proper isolation controls are in place between virtual instances and host systems.