CVE-2015-4230 in Headend System Release
Summary
by MITRE
Memory leak in Cisco Headend System Release allows remote attackers to cause a denial of service (memory consumption) via unspecified vectors, aka Bug ID CSCus91854.
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Analysis
by VulDB Data Team • 05/23/2022
The vulnerability identified as CVE-2015-4230 represents a memory leak flaw within Cisco Headend System Release that enables remote attackers to execute denial of service attacks through unspecified vectors. This issue manifests as excessive memory consumption on affected systems, ultimately leading to system instability and potential service disruption. The vulnerability was catalogued under Bug ID CSCus91854, indicating its classification within Cisco's internal tracking systems. The memory leak occurs during normal system operations when processing specific network traffic or configuration inputs, causing the system to continuously allocate memory without proper deallocation mechanisms. This flaw specifically impacts Cisco Headend System Release versions that are susceptible to uncontrolled memory growth, creating a persistent resource exhaustion condition that can be exploited remotely without requiring authentication or specialized privileges. The vulnerability's remote exploitability means that attackers can initiate the memory consumption attack from external network positions, making it particularly dangerous for systems exposed to untrusted networks. According to CWE classification, this vulnerability maps to CWE-401: Improper Release of Memory, which describes the failure to properly release allocated memory resources. The flaw demonstrates characteristics of a resource exhaustion attack pattern that aligns with ATT&CK technique T1499.004: Endpoint Denial of Service, where adversaries consume system resources to prevent legitimate use of services. The memory leak mechanism typically occurs when the system processes malformed packets or specific data sequences that trigger improper memory management routines within the headend processing modules. Attackers can repeatedly send crafted network traffic to the affected system, causing progressive memory consumption until system performance degrades significantly or the system becomes completely unresponsive.
The operational impact of CVE-2015-4230 extends beyond simple service disruption to encompass potential business continuity issues for organizations relying on Cisco Headend systems for content delivery and broadcast operations. When the memory leak occurs, affected systems may experience gradual performance degradation, application crashes, or complete system hang conditions that require manual intervention to restore normal operations. The vulnerability's persistence means that once exploited, the memory consumption continues until the system is manually rebooted or the memory leak is patched through software updates. Organizations using Cisco Headend systems for critical broadcast services or content delivery networks face significant operational risks as this flaw can lead to service interruptions affecting multiple subscribers or content streams simultaneously. The remote nature of the attack vector eliminates the need for physical access or network proximity, making the vulnerability particularly attractive to attackers seeking to disrupt services without detection. System administrators must monitor memory usage patterns closely to detect the onset of this vulnerability, as the gradual memory consumption may not immediately trigger alerts or obvious system failures. The vulnerability affects systems where Cisco Headend components are deployed in production environments, particularly those handling high volumes of network traffic or serving multiple concurrent users. Network monitoring tools and intrusion detection systems may not immediately flag this vulnerability as a security threat since the memory leak appears as normal system resource consumption rather than malicious network activity.
Mitigation strategies for CVE-2015-4230 should focus on immediate software updates and system hardening measures to prevent exploitation. Cisco released patches and updates addressing this vulnerability in subsequent software releases, making it critical for organizations to apply these updates promptly to their affected systems. System administrators should implement monitoring protocols to track memory consumption patterns and establish automated alerts when memory usage exceeds predetermined thresholds, enabling early detection of potential exploitation attempts. Network segmentation and access controls can limit the attack surface by restricting remote access to vulnerable headend systems and implementing strict firewall rules to control traffic flows. The implementation of memory management policies and regular system maintenance procedures can help prevent accumulation of leaked memory resources, while also providing baseline performance metrics for detecting anomalous behavior. Organizations should conduct regular vulnerability assessments and penetration testing to identify systems running affected Cisco Headend releases and ensure proper patch management protocols are in place. The recommended approach includes disabling unnecessary services and features that may contribute to memory consumption, implementing robust logging mechanisms to track system behavior, and establishing incident response procedures specifically designed to address resource exhaustion attacks. Regular system audits should verify that all Cisco Headend components are running patched versions and that no legacy or unsupported software remains in production environments. Additionally, organizations should consider implementing redundant systems or failover mechanisms to maintain service availability during patch deployment or system restoration activities, ensuring business continuity despite potential exploitation attempts.