CVE-2015-3002 in Junos
Summary
by MITRE
Juniper Junos 12.1X44 before 12.1X44-D45, 12.1X46 before 12.1X46-D30, 12.1X47 before 12.1X47-D15, and 12.3X48 before 12.3X48-D10 on SRX series devices does not properly enforce the log-out-on-disconnect feature when configured in the [system port console] stanza, which allows physically proximate attackers to reconnect to the console port and gain administrative access by leveraging access to the device.
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Analysis
by VulDB Data Team • 05/03/2022
The vulnerability described in CVE-2015-3002 affects Juniper Junos operating system versions running on SRX series devices, specifically targeting the console port security mechanisms that should enforce log-out-on-disconnect functionality. This weakness resides within the configuration stanza [system port console] where the system fails to properly implement the intended security controls that would terminate administrative sessions when network connections are severed. The flaw represents a critical design oversight in the authentication and session management protocols that govern console access to network infrastructure equipment. Attackers exploiting this vulnerability can physically access the console port of affected devices and maintain administrative access even after legitimate sessions have ended, creating a persistent backdoor that bypasses normal security controls.
The technical implementation flaw stems from improper enforcement of session termination mechanisms within the Junos operating system's console port handling code. When the log-out-on-disconnect feature is configured in the [system port console] context, the system should automatically invalidate administrative sessions when the physical or network connection is broken. However, this enforcement mechanism fails to properly execute, allowing attackers to establish new connections to the console port without proper authentication. The vulnerability manifests because the operating system does not adequately validate session state transitions or maintain proper session tracking when console port connections are terminated, creating a window of opportunity for unauthorized access. This weakness specifically impacts devices running vulnerable versions of Junos software where the console port security controls have not been properly updated or patched.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with persistent administrative access to critical network infrastructure devices. Physically proximate attackers can exploit this weakness without requiring network-based attacks or complex exploitation techniques, making the vulnerability particularly dangerous in environments where physical access to network equipment is possible. Once an attacker gains access through this vulnerability, they can modify device configurations, access sensitive network data, redirect traffic, or establish further attack vectors within the network infrastructure. The vulnerability undermines fundamental security principles of least privilege and proper access control, as it allows unauthorized individuals to maintain administrative capabilities on network devices even after legitimate sessions have ended. This persistent access capability significantly increases the potential for data breaches, network disruption, and compromise of the entire network infrastructure that relies on these devices for security enforcement.
Security professionals should implement immediate mitigations including applying the latest Juniper software patches that address this specific vulnerability, as well as implementing additional physical security controls to restrict access to console ports on affected devices. Network administrators must verify that all SRX series devices are running patched versions of Junos software and that the [system port console] configuration properly enforces log-out-on-disconnect functionality. Additional defensive measures include implementing strict physical access controls for network equipment, monitoring console port access logs for unauthorized activity, and ensuring that console port access is properly audited and logged. Organizations should also consider implementing network segmentation and access control measures to limit the impact of potential compromise, as this vulnerability can provide attackers with direct administrative access to critical network infrastructure. The vulnerability aligns with CWE-284 Access Control Issues and maps to ATT&CK technique T1078 Valid Accounts, as it enables unauthorized access through legitimate administrative accounts that remain active after normal session termination.
This vulnerability demonstrates the critical importance of proper session management and access control implementation in network infrastructure devices, particularly those handling console access. The flaw represents a failure in the principle of least privilege and proper authentication enforcement, where the system does not adequately protect against unauthorized reconnection attempts. Organizations should conduct comprehensive vulnerability assessments to identify all affected devices and ensure that all network infrastructure equipment is running properly patched software versions. Regular security audits of console port configurations and access controls should be implemented to prevent similar vulnerabilities from developing in the future. The incident highlights the need for robust security testing of authentication and session management mechanisms in network operating systems, particularly those controlling physical access points to critical infrastructure equipment.