CVE-2015-5044 in Security QRadar QFLOW
Summary
by MITRE
The Flow Collector in IBM Security QRadar QFLOW 7.1.x before 7.1 MR2 Patch 11 IF3 and 7.2.x before 7.2.5 Patch 4 IF3 allows remote attackers to cause a denial of service via unspecified packets.
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Analysis
by VulDB Data Team • 03/08/2018
The vulnerability identified as CVE-2015-5044 affects the Flow Collector component within IBM Security QRadar QFLOW versions 7.1.x prior to 7.1 MR2 Patch 11 IF3 and 7.2.x prior to 7.2.5 Patch 4 IF3. This represents a critical denial of service weakness that specifically targets the flow data collection mechanism of the QRadar security information and event management platform. The affected system processes network flow data from various sources including network devices, firewalls, and other security appliances that generate flow records for security monitoring and analysis purposes. The Flow Collector serves as the primary ingestion point for this flow data, making it a crucial component in the overall security monitoring infrastructure.
The technical flaw manifests when the Flow Collector receives specially crafted or malformed packets that trigger an unexpected behavior in the data processing pipeline. While the exact nature of these unspecified packets remains undocumented in the public CVE description, this type of vulnerability typically involves buffer overflows, memory corruption issues, or improper input validation during packet parsing. The vulnerability operates at the network protocol level where the collector fails to properly handle certain packet structures, leading to system instability and eventual service disruption. This weakness falls under the CWE-121 category of stack-based buffer overflow or more broadly encompasses CWE-122 which deals with heap-based buffer overflows, though the specific classification would depend on the implementation details of the packet processing code.
The operational impact of CVE-2015-5044 is significant for organizations relying on QRadar for network security monitoring and threat detection. When exploited, the vulnerability can cause the Flow Collector service to crash or become unresponsive, resulting in complete loss of flow data collection capabilities. This disruption directly affects the organization's ability to monitor network traffic patterns, detect anomalies, and respond to potential security incidents in real-time. The denial of service condition can persist until manual intervention occurs, requiring system administrators to restart the affected services or potentially reboot the entire QRadar appliance. This downtime creates windows of vulnerability where network security events may go undetected, potentially allowing malicious activities to occur without detection during the service interruption period.
Organizations should implement immediate mitigations including applying the vendor-provided patches for both the 7.1 and 7.2 product lines as specified in the advisory. The patching process should be carefully planned and tested in non-production environments before deployment to ensure compatibility with existing network monitoring configurations. Network segmentation strategies can provide additional defense-in-depth by limiting direct access to the QRadar Flow Collector service from untrusted networks. Monitoring for unusual traffic patterns or service disruptions can help detect exploitation attempts, though the vulnerability may be difficult to distinguish from other network issues without proper log correlation. The ATT&CK framework categorizes this type of vulnerability under T1499.004 for Network Denial of Service, where adversaries may exploit weaknesses in network infrastructure components to disrupt availability of security monitoring capabilities. Additionally, implementing proper input validation and robust error handling in the Flow Collector component would align with security best practices and help prevent similar vulnerabilities from emerging in future versions of the software.