CVE-2017-11480 in Packetbeat
Summary
by MITRE
Packetbeat versions prior to 5.6.4 are affected by a denial of service flaw in the PostgreSQL protocol handler. If Packetbeat is listening for PostgreSQL traffic and a user is able to send arbitrary network traffic to the monitored port, the attacker could prevent Packetbeat from properly logging other PostgreSQL traffic.
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Analysis
by VulDB Data Team • 12/12/2019
The vulnerability identified as CVE-2017-11480 represents a critical denial of service weakness within Packetbeat software versions earlier than 5.6.4, specifically affecting the PostgreSQL protocol handler component. This flaw manifests when Packetbeat operates in a monitoring capacity for PostgreSQL database traffic, creating a scenario where malicious actors can exploit the protocol handler's processing logic to disrupt normal operational functions. The vulnerability stems from insufficient input validation and error handling mechanisms within the PostgreSQL protocol parsing code, allowing crafted network packets to trigger unexpected behavior in the monitoring tool.
Packetbeat serves as a network monitoring tool that captures and analyzes network traffic, particularly excelling in protocol-specific monitoring such as PostgreSQL database communications. When configured to monitor PostgreSQL traffic, the software employs a protocol handler to parse and process incoming database packets, extracting relevant information for logging and analysis. The flaw occurs when the PostgreSQL protocol handler encounters malformed or unexpected packet structures that it cannot properly process, leading to the complete disruption of the monitoring function. This disruption manifests as the software's inability to properly log or analyze subsequent PostgreSQL traffic, effectively creating a denial of service condition for the monitoring system itself.
The operational impact of this vulnerability extends beyond simple service disruption, as it fundamentally compromises the integrity of network monitoring operations. Organizations relying on Packetbeat for PostgreSQL traffic analysis face the risk of complete monitoring failure when attackers exploit this flaw, potentially leaving database communications unobserved and creating blind spots in network security monitoring. The vulnerability is particularly concerning in environments where Packetbeat serves as a critical component of security operations, as it can be leveraged to evade detection of malicious database activities. According to CWE classification, this represents a weakness in the protocol handler's error handling mechanisms, specifically categorized under CWE-248, which addresses "Uncaught Exception" conditions in protocol processing.
Attackers can exploit this vulnerability by sending specifically crafted network packets to the monitored PostgreSQL port, triggering the protocol handler to enter an unrecoverable state or loop. This technique aligns with ATT&CK framework tactics under T1498, which covers "Network Denial of Service" and T1071.004, covering "Application Layer Protocol: DNS," although the specific technique used in this case targets PostgreSQL protocol rather than DNS. The attack vector requires only network access to the monitored port, making it particularly dangerous as it can be executed from external networks or even within the same network segment. The flaw demonstrates poor defensive programming practices where the software fails to implement proper exception handling for malformed protocol data, creating a pathway for attackers to intentionally crash or destabilize the monitoring infrastructure.
Organizations should immediately implement mitigation strategies including upgrading Packetbeat to version 5.6.4 or later, which contains the necessary patches to address the protocol handler vulnerability. Network segmentation and access controls should be strengthened to limit unauthorized access to monitored ports, while implementing additional monitoring for unusual network behavior that might indicate exploitation attempts. The patch addresses the core issue by implementing proper input validation and error handling within the PostgreSQL protocol handler, ensuring that malformed packets do not cause the software to fail or become unresponsive. Security teams should also consider implementing network-based intrusion detection systems to monitor for exploitation attempts and establish incident response procedures specifically addressing protocol handler vulnerabilities in monitoring tools. This vulnerability highlights the importance of maintaining current software versions and implementing robust input validation practices in network monitoring tools, as these systems often serve as critical infrastructure components in security operations.