CVE-2014-2103 in IPS
Summary
by MITRE
Cisco Intrusion Prevention System (IPS) Software allows remote attackers to cause a denial of service (MainApp process outage) via malformed SNMP packets, aka Bug IDs CSCum52355 and CSCul49309.
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Analysis
by VulDB Data Team • 04/12/2025
The vulnerability described in CVE-2014-2103 represents a critical denial of service weakness within Cisco's Intrusion Prevention System software ecosystem. This flaw specifically targets the MainApp process component of the IPS software, creating a scenario where remote attackers can trigger system-wide outages through carefully crafted malicious SNMP packets. The vulnerability manifests in a manner that directly impacts the operational continuity of network security infrastructure, potentially leaving organizations exposed to threats during critical periods of system unavailability. The bug identifiers CSCum52355 and CSCul49309 indicate that this issue was recognized and tracked by Cisco's internal vulnerability management systems, highlighting the severity and widespread nature of the problem across various Cisco IPS deployments.
The technical mechanism behind this vulnerability involves improper input validation within the SNMP packet processing subsystem of the IPS software. When malformed SNMP packets are received by the affected system, they trigger an exception in the MainApp process that leads to complete system failure or unresponsiveness. This represents a classic buffer overflow or parsing error scenario where the software fails to properly handle unexpected input formats, causing the process to terminate or enter an unrecoverable state. The vulnerability is particularly concerning because SNMP is a widely used protocol for network management and monitoring, making it an attractive attack vector for adversaries seeking to disrupt network security operations. This flaw aligns with CWE-121, which describes buffer overflow conditions, and demonstrates how improper validation of input data can lead to process termination and system instability.
The operational impact of CVE-2014-2103 extends beyond simple service disruption to encompass broader security implications for network infrastructure. Organizations relying on Cisco IPS for network protection face significant risk when this vulnerability is exploited, as the denial of service can occur without any authentication requirements, making it particularly dangerous for remote attackers. The MainApp process outage creates a window of vulnerability where network traffic is no longer being inspected for malicious activity, effectively removing a critical layer of network security protection. This situation can lead to cascading failures in network operations, as administrators may not immediately recognize the extent of the compromise, and the system's inability to process legitimate SNMP traffic further compounds the operational challenges. The vulnerability also demonstrates how network security tools themselves can become attack vectors when not properly hardened against malformed inputs.
Mitigation strategies for this vulnerability require immediate implementation of Cisco's security patches and updates, as well as network segmentation and monitoring to detect anomalous SNMP traffic patterns. Organizations should implement SNMP access controls to limit which systems can communicate with IPS devices and deploy network monitoring solutions that can identify malformed SNMP packets before they reach the vulnerable software components. The remediation process should include comprehensive testing of updated software in controlled environments before deployment to production systems, following best practices established by the Center for Internet Security and other security frameworks. Additionally, network administrators should consider implementing redundant security monitoring solutions to ensure that the failure of one system does not leave the entire network vulnerable. The vulnerability also underscores the importance of regular security assessments and penetration testing to identify similar weaknesses in network infrastructure components, aligning with ATT&CK framework techniques that focus on privilege escalation and denial of service operations.