CVE-2015-2829 in Netscaler Gateway
Summary
by MITRE
Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway before 10.5 Build 53.9 through 55.8 and 10.5.e Build 53-9010.e allow remote attackers to cause a denial of service (reboot) via unspecified vectors.
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Analysis
by VulDB Data Team • 11/26/2024
The Citrix NetScaler Application Delivery Controller and NetScaler Gateway appliances represent critical infrastructure components in enterprise network environments, serving as load balancers, application delivery controllers, and secure access gateways. These appliances are widely deployed across organizations to manage traffic flow, provide SSL offloading, and enforce security policies for remote access. The vulnerability identified as CVE-2015-2829 specifically affects versions prior to 10.5 Build 53.9 through 55.8 and 10.5.e Build 53-9010.e, creating a significant risk for organizations relying on these platforms for their network security and application delivery functions. This vulnerability falls under the category of denial of service attacks that can result in complete system reboot, effectively rendering the appliance unavailable and potentially disrupting critical business operations.
The technical flaw in CVE-2015-2829 manifests as an unspecified vector that allows remote attackers to trigger a system reboot without requiring authentication or physical access to the appliance. This vulnerability represents a critical design flaw in the appliance's input validation and error handling mechanisms, where malformed or specially crafted network traffic can cause the system to crash and automatically reboot. The unspecified nature of the attack vector suggests that multiple pathways exist for exploitation, potentially including protocol parsing issues, memory corruption vulnerabilities, or improper state management within the appliance's network stack. Such vulnerabilities are particularly dangerous because they can be exploited from outside the network perimeter, making them accessible to attackers with no prior access to the internal network.
The operational impact of this vulnerability extends far beyond simple service disruption, as the Citrix NetScaler appliances are fundamental components of enterprise security infrastructure. When these appliances experience unauthorized reboots, they can cause cascading failures throughout the network, disrupting application availability, breaking secure remote access sessions, and potentially exposing the organization to additional security risks. The automatic reboot process can result in the loss of current session information, cached data, and potentially compromise the integrity of ongoing network transactions. Organizations relying on these appliances for SSL offloading and application delivery may experience significant downtime, with recovery times potentially extending beyond hours depending on the complexity of the network configuration and the need for manual intervention to restore services.
Mitigation strategies for CVE-2015-2829 should prioritize immediate patching of affected appliances to the latest available versions that contain the necessary security fixes. Organizations should implement network segmentation and access controls to limit exposure of these appliances to untrusted networks, while also deploying intrusion detection systems to monitor for suspicious traffic patterns that may indicate exploitation attempts. The vulnerability aligns with attack patterns documented in the ATT&CK framework under the 'Reconnaissance' and 'Resource Hijacking' domains, as attackers can leverage these vulnerabilities to gain control over critical infrastructure components. Additionally, implementing proper network monitoring and logging mechanisms becomes essential for detecting potential exploitation attempts and maintaining visibility into system health. Organizations should also consider implementing redundant appliances or failover mechanisms to minimize the impact of potential exploitation, while ensuring that all network traffic to these critical systems is properly filtered and monitored to prevent unauthorized access to the vulnerable components.