CVE-2018-16878 in Pacemaker
Summary
by MITRE
A flaw was found in pacemaker up to and including version 2.0.1. An insufficient verification inflicted preference of uncontrolled processes can lead to DoS
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 09/04/2023
The vulnerability identified as CVE-2018-16878 resides within the pacemaker cluster management software, a critical component in high-availability computing environments that orchestrates resource management across multiple nodes. This flaw affects versions up to and including 2.0.1, representing a significant security concern for organizations relying on cluster infrastructure for mission-critical operations. The vulnerability stems from inadequate verification mechanisms that allow uncontrolled processes to gain preference within the cluster scheduling algorithm, creating a pathway for malicious actors to disrupt normal cluster operations.
The technical implementation of this vulnerability involves insufficient input validation and process verification within pacemaker's resource management framework. When the cluster manager evaluates resource placement and process execution priorities, it fails to adequately authenticate or validate the legitimacy of processes attempting to gain scheduling preference. This weakness enables attackers to manipulate the cluster's decision-making process by injecting malicious or unauthorized processes that can override legitimate resource allocation decisions. The flaw essentially allows for a form of process preference manipulation that can be exploited to cause denial of service conditions within the cluster environment.
The operational impact of CVE-2018-16878 extends beyond simple service disruption to potentially compromise the entire cluster infrastructure. Organizations utilizing pacemaker for critical applications such as database clustering, load balancing, or distributed computing environments face significant risk when this vulnerability exists. An attacker exploiting this flaw can cause legitimate services to be preempted or terminated, leading to service outages that can cascade across interconnected systems. The vulnerability is particularly dangerous because it operates at the core of cluster management functionality, where the consequences of disruption can affect multiple dependent services and applications.
From a cybersecurity perspective, this vulnerability aligns with CWE-284, which addresses inadequate access control mechanisms, and demonstrates characteristics consistent with ATT&CK technique T1499.004 related to network disruption. The flaw represents a privilege escalation vector that can be leveraged to manipulate cluster resource allocation decisions, potentially allowing attackers to gain deeper system control. Organizations should prioritize patching this vulnerability as it can be exploited without requiring elevated privileges, making it particularly dangerous in environments where cluster management interfaces may be exposed to untrusted networks. The remediation approach involves updating to pacemaker versions that implement proper process verification and authentication mechanisms, ensuring that only legitimate processes can influence cluster scheduling decisions and maintaining the integrity of resource allocation policies.
The broader implications of this vulnerability highlight the critical importance of input validation and access control in distributed systems management. Cluster management software serves as the backbone for high-availability infrastructure, making it a prime target for attackers seeking to disrupt critical services. The vulnerability demonstrates how seemingly minor flaws in process verification can have cascading effects throughout complex distributed environments, emphasizing the need for comprehensive security testing of cluster management components. Organizations should implement network segmentation and access controls around cluster management interfaces to limit exposure, while also maintaining regular patching schedules to address known vulnerabilities in critical infrastructure software.