CVE-2017-2311 in Junos Space
Summary
by MITRE
On Juniper Networks Junos Space versions prior to 16.1R1, an unauthenticated remote attacker with network access to Junos space device can easily create a denial of service condition.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 05/31/2017
The vulnerability identified as CVE-2017-2311 affects Juniper Networks Junos Space platforms running versions earlier than 16.1R1, representing a critical remote denial of service weakness that can be exploited by unauthenticated attackers. This flaw resides within the network management system's handling of specific network protocols and communication channels, creating an avenue for malicious actors to disrupt service availability without requiring any authentication credentials or privileged access. The vulnerability specifically targets the device's ability to process incoming network traffic and maintain operational stability, fundamentally undermining the reliability of the network management infrastructure.
The technical implementation of this vulnerability stems from improper input validation and resource management within the Junos Space software stack, where the system fails to adequately sanitize or limit the processing of malformed network packets or unexpected communication patterns. This weakness allows an attacker to send specifically crafted network traffic that triggers an unintended state within the system's processing logic, causing the device to become unresponsive or crash entirely. The flaw operates at the network protocol level, affecting how the system handles incoming connections and data processing, making it particularly dangerous as it can be exploited from any network location with access to the device's network interfaces. The vulnerability is classified under CWE-20, which represents improper input validation, and aligns with ATT&CK technique T1499.002 for network denial of service attacks.
The operational impact of this vulnerability extends beyond simple service disruption, as it can severely compromise network management capabilities and potentially affect the broader network infrastructure that relies on Junos Space for monitoring and control. Organizations utilizing affected versions may experience complete loss of management access, requiring manual intervention to restore system functionality and potentially leading to extended downtime. The vulnerability's unauthenticated nature means that any network-connected attacker can exploit it without prior credentials, making it particularly dangerous for systems with exposed management interfaces. This weakness can be leveraged to create cascading failures that impact network operations, as network administrators lose the ability to monitor, configure, or troubleshoot network devices through the compromised management platform.
Mitigation strategies for CVE-2017-2311 require immediate implementation of software updates to Junos Space platforms, specifically upgrading to version 16.1R1 or later where the vulnerability has been addressed through proper input validation and resource management improvements. Network segmentation and access control measures should be implemented to limit exposure of Junos Space devices to untrusted networks, while firewall rules can be configured to restrict access to management ports and services. Organizations should also implement network monitoring solutions to detect anomalous traffic patterns that may indicate exploitation attempts, and establish incident response procedures for rapid recovery from potential denial of service events. Regular vulnerability assessments and penetration testing should be conducted to identify similar weaknesses in other network management systems, while maintaining updated threat intelligence feeds to stay informed about related attack patterns and exploitation techniques.