CVE-2018-0024 in Junos
Summary
by MITRE
An Improper Privilege Management vulnerability in a shell session of Juniper Networks Junos OS allows an authenticated unprivileged attacker to gain full control of the system. Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D45 on SRX Series; 12.3X48 versions prior to 12.3X48-D20 on SRX Series; 12.3 versions prior to 12.3R11 on EX Series; 14.1X53 versions prior to 14.1X53-D30 on EX2200/VC, EX3200, EX3300/VC, EX4200, EX4300, EX4550/VC, EX4600, EX6200, EX8200/VC (XRE), QFX3500, QFX3600, QFX5100;; 15.1X49 versions prior to 15.1X49-D20 on SRX Series.
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Analysis
by VulDB Data Team • 04/06/2023
The vulnerability identified as CVE-2018-0024 represents a critical improper privilege management flaw within the shell session functionality of Juniper Networks Junos OS operating systems. This weakness specifically targets the privilege escalation mechanisms that should normally prevent unprivileged users from accessing elevated system controls. The vulnerability exists in multiple product lines including SRX Series firewalls and EX/QFX Series switches, creating a widespread security risk across Juniper's network infrastructure deployments. The flaw allows authenticated users who possess minimal privileges to exploit shell session behaviors and escalate their access to full system control, effectively bypassing the intended security boundaries that separate user access from administrative functions.
Technical analysis reveals that this vulnerability stems from insufficient validation of user privileges within the shell execution environment. When legitimate users establish shell sessions, the system fails to properly enforce privilege checks that should prevent non-privileged accounts from executing commands with elevated permissions. This misconfiguration creates a path where attackers can manipulate shell session parameters or exploit specific command execution flows to gain root-level access. The vulnerability is particularly concerning because it does not require special attack vectors or complex exploitation techniques - simply authenticating to the system with basic credentials provides sufficient access to trigger the privilege escalation mechanism. This weakness directly aligns with CWE-276, which describes improper privilege management in software systems where access controls are not properly enforced.
The operational impact of CVE-2018-0024 extends far beyond simple unauthorized access, as successful exploitation provides attackers with complete system control capabilities including the ability to modify network configurations, install malicious software, access sensitive data, and potentially compromise the entire network infrastructure. Network administrators face significant risks when this vulnerability is present, as it allows attackers to move laterally within the network and potentially gain access to other systems connected to the compromised Juniper devices. The affected versions span multiple Junos OS releases across different hardware platforms, making this vulnerability particularly dangerous for organizations with diverse network equipment. Attackers leveraging this vulnerability could execute commands with full administrative privileges, effectively allowing them to manipulate firewall rules, modify routing tables, and potentially establish persistent backdoors within the network infrastructure.
Organizations should implement immediate mitigation strategies to address this vulnerability, beginning with applying the vendor-provided security patches and updates to all affected Junos OS versions. The recommended approach involves upgrading to the specific patch releases mentioned in the CVE advisory, which include versions 12.1X46-D45, 12.3X48-D20, 12.3R11, 14.1X53-D30, and 15.1X49-D20. Network security teams should also consider implementing additional monitoring and access control measures to detect potential exploitation attempts, as the vulnerability may be difficult to detect through conventional security scanning methods. Organizations should review their current privilege management policies and ensure that only necessary users have access to shell sessions, while also implementing principle of least privilege enforcement across all network devices. This vulnerability demonstrates the critical importance of proper privilege management within network infrastructure devices and aligns with ATT&CK technique T1068 which covers privilege escalation through improper privilege management.