CVE-2016-1324 in Spark
Summary
by MITRE
The REST interface in Cisco Spark 2015-06 allows remote attackers to cause a denial of service (resource outage) by accessing an administrative page, aka Bug ID CSCuv84125.
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Analysis
by VulDB Data Team • 08/22/2018
The vulnerability described in CVE-2016-1324 affects the REST interface of Cisco Spark version 2015-06, representing a critical security flaw that enables remote attackers to execute denial of service attacks against the system. This issue specifically targets administrative pages within the platform's REST API implementation, creating a pathway for malicious actors to disrupt normal service operations. The vulnerability is particularly concerning because it allows unauthorized remote access to administrative functionality without proper authentication mechanisms, effectively providing attackers with elevated privileges to manipulate system resources.
The technical flaw stems from insufficient access controls and authentication checks within the REST interface implementation. When attackers access specific administrative endpoints through the REST API, they can trigger resource exhaustion conditions that lead to system unavailability. This type of vulnerability typically falls under CWE-284 Access Control Issues, where improper access control mechanisms allow unauthorized users to access privileged functions. The flaw demonstrates poor input validation and authorization enforcement, as the system fails to properly verify user credentials or roles before granting access to administrative resources. The REST interface in Cisco Spark appears to lack proper session management and privilege escalation controls, enabling attackers to exploit the administrative pages through simple API requests.
The operational impact of this vulnerability is severe and multifaceted, potentially affecting the availability and reliability of Cisco Spark services for legitimate users. A successful exploitation can result in complete service outages, preventing authorized administrators and users from accessing collaborative communication features. This disruption can cascade into broader business operations, particularly in enterprise environments where Cisco Spark serves as a critical communication platform. The vulnerability aligns with ATT&CK technique T1499.004 Network Denial of Service, where adversaries leverage system weaknesses to make network resources unavailable to intended users. Organizations relying on Cisco Spark for business continuity may experience significant downtime, reduced productivity, and potential financial losses due to the unavailability of critical communication services.
Mitigation strategies should focus on immediate access control hardening and network-level protections to prevent unauthorized access to administrative REST endpoints. Organizations should implement proper authentication mechanisms including multi-factor authentication, enforce strict API rate limiting to prevent abuse, and establish network segmentation to isolate administrative interfaces from public access. The fix typically involves implementing proper authorization checks at each REST endpoint, ensuring that only authenticated administrators can access administrative functions. Security patches should be applied immediately to address the underlying access control vulnerabilities, and organizations should conduct thorough security assessments of their REST API implementations to identify similar weaknesses. Network monitoring should be enhanced to detect unusual API access patterns that might indicate exploitation attempts, while regular security audits should verify that access controls remain properly configured and that no unauthorized modifications have been made to administrative interfaces.