CVE-2019-20853 in Mattermost Packages
Summary
by MITRE
An issue was discovered in Mattermost Packages before 5.16.3. A Droplet could allow Internet access to a service that has a remote code execution problem.
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Analysis
by VulDB Data Team • 10/25/2020
The vulnerability identified as CVE-2019-20853 represents a critical security flaw in Mattermost Packages versions prior to 5.16.3 that exposes systems to unauthorized remote code execution risks. This issue stems from improper network access controls within the Droplet configuration, creating a pathway for malicious actors to gain unauthorized access to services running on affected systems. The vulnerability specifically affects the containerized deployment environment where Mattermost packages are installed, allowing attackers to potentially execute arbitrary code on the underlying host system through compromised services.
The technical root cause of this vulnerability lies in the insufficient isolation mechanisms between network services and the host operating system within the Droplet environment. When Mattermost packages are deployed using vulnerable versions, the network configuration fails to properly restrict access to internal services that should remain isolated from external internet access. This misconfiguration creates a scenario where remote attackers can exploit the exposed service endpoints to gain elevated privileges and execute malicious code on the host system. The flaw essentially undermines the fundamental security principle of network segmentation by allowing internet-facing services to communicate with internal components that should be protected from external access.
From an operational impact perspective, this vulnerability presents a severe risk to organizations using Mattermost for enterprise communication and collaboration. Attackers exploiting this vulnerability could potentially compromise entire communication platforms, leading to data breaches, service disruption, and unauthorized access to sensitive organizational information. The remote code execution capability means that threat actors could establish persistent backdoors, escalate privileges, or deploy additional malware on the compromised systems. Organizations relying on Mattermost for critical business communications face significant risk of exposure to advanced persistent threats that could remain undetected for extended periods.
The vulnerability aligns with CWE-284, which addresses improper access control in software systems, and demonstrates how inadequate network security controls can create dangerous attack vectors. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence, as attackers could leverage the remote code execution capability to maintain long-term access to compromised systems. The attack surface expands significantly when considering that Mattermost is often used for sensitive internal communications, making the compromise of such systems particularly damaging to organizational security posture. Organizations should prioritize immediate remediation of this vulnerability through patching to version 5.16.3 or later, while also implementing additional network segmentation measures to reduce the potential impact of similar vulnerabilities in the future.
Effective mitigation strategies should include immediate deployment of the patched Mattermost Packages version, implementation of network access controls to restrict unnecessary internet exposure, and regular security assessments of containerized environments. Organizations should also establish monitoring procedures to detect unauthorized access attempts and maintain comprehensive incident response capabilities to address potential exploitation of this vulnerability. The remediation process must include thorough testing of patched environments to ensure that the security fixes do not introduce compatibility issues with existing Mattermost deployments while maintaining the integrity of the communication platform.