CVE-2018-20034 in Communications LSMS
Summary
by MITRE
A Denial of Service vulnerability related to adding an item to a list in lmgrd and vendor daemon components of FlexNet Publisher version 11.16.1.0 and earlier allows a remote attacker to send a combination of messages to lmgrd or the vendor daemon, causing the heartbeat between lmgrd and the vendor daemon to stop, and the vendor daemon to shut down.
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Analysis
by VulDB Data Team • 07/30/2024
This vulnerability resides within the FlexNet Publisher licensing system, specifically affecting lmgrd and vendor daemon components in version 11.16.1.0 and earlier. The flaw represents a critical denial of service condition that can be exploited remotely by attackers who craft specific message combinations. The vulnerability stems from inadequate input validation and error handling within the communication protocols between the license manager daemon and vendor daemons, creating a pathway for malicious actors to disrupt the licensing infrastructure. According to CWE-400, this vulnerability falls under the category of Uncontrolled Resource Consumption, where the system fails to properly manage resource allocation during message processing. The attack vector involves sending carefully constructed messages that trigger a cascade of failures in the heartbeat mechanism, which is fundamental to maintaining communication between lmgrd and vendor daemon processes. This represents a sophisticated attack pattern that leverages the inherent trust relationships within the licensing system to cause operational disruption.
The technical implementation of this vulnerability exploits the communication protocols that govern how lmgrd and vendor daemons maintain their operational state through periodic heartbeat exchanges. When an attacker sends malformed or specially crafted messages to either component, the system fails to properly validate the incoming data and process it according to established protocols. This failure causes the heartbeat mechanism to break down, which in turn leads to the vendor daemon shutting down as a protective measure against corrupted state conditions. The vulnerability demonstrates a lack of proper exception handling and resource management within the licensing daemon code, where failure to process legitimate messages properly results in cascading failures that ultimately terminate the vendor daemon service. This type of attack aligns with ATT&CK technique T1499.004, which covers Network Denial of Service, and represents a sophisticated approach to service disruption through protocol manipulation rather than direct resource exhaustion.
The operational impact of this vulnerability extends beyond simple service interruption, as it can severely compromise the availability of licensing services for legitimate users and applications. When the vendor daemon shuts down due to heartbeat failure, organizations may experience complete licensing outages that can affect software usage, productivity, and business operations. The remote nature of the attack means that adversaries can exploit this vulnerability from outside the organization's network, making it particularly dangerous for companies that rely on FlexNet Publisher for software licensing management. Organizations may find their license management systems become unresponsive, requiring manual intervention to restart services and restore functionality. The vulnerability also creates opportunities for attackers to use this disruption as a stepping stone for additional attacks or to create conditions where legitimate users cannot access licensed software, potentially leading to significant business disruption and compliance issues.
Mitigation strategies for this vulnerability should focus on immediate patching of affected systems to version 11.16.2.0 or later, which contains the necessary fixes for the heartbeat and message processing mechanisms. Network segmentation and access controls should be implemented to limit exposure of lmgrd and vendor daemon components to untrusted networks, reducing the attack surface available to potential adversaries. Implementing monitoring solutions that can detect anomalous message patterns or heartbeat failures can provide early warning of exploitation attempts. Organizations should also establish automated recovery procedures that can quickly restart vendor daemons when heartbeat failures occur, minimizing downtime impact. The fix addresses the underlying CWE-400 issue by implementing proper input validation and error handling mechanisms that prevent malformed messages from causing system state corruption. Additionally, implementing rate limiting and message validation at network boundaries can help prevent exploitation attempts, while regular security assessments of licensing infrastructure can identify similar vulnerabilities in other system components. This vulnerability highlights the importance of maintaining robust security practices in licensing and entitlement management systems, which are often overlooked despite their critical role in software deployment and usage control.