CVE-2020-7839 in MaEPSBroker
Summary
by MITRE • 03/24/2021
In MaEPSBroker 2.5.0.31 and prior, a command injection vulnerability caused by improper input validation checks when parsing brokerCommand parameter.
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Analysis
by VulDB Data Team • 04/04/2021
The command injection vulnerability identified as CVE-2020-7839 resides within MaEPSBroker version 2.5.0.31 and earlier releases, representing a critical security flaw that undermines the integrity of the system's input validation mechanisms. This vulnerability specifically affects the brokerCommand parameter handling within the MaEPSBroker application, creating an exploitable condition where malicious actors can inject arbitrary commands that execute within the system's operational context. The flaw stems from inadequate sanitization and validation of user-supplied input, allowing attackers to bypass normal security controls and potentially gain unauthorized access to system resources.
The technical exploitation of this vulnerability occurs when the MaEPSBroker application processes the brokerCommand parameter without proper validation, enabling attackers to submit malicious command sequences that get executed by the underlying operating system. This type of vulnerability falls under CWE-77 which categorizes command injection flaws, where user-controllable data is directly incorporated into command execution contexts without appropriate sanitization. The vulnerability demonstrates a classic lack of input validation that permits dangerous characters and sequences to propagate through the system, potentially leading to complete system compromise. Attackers can leverage this weakness to execute arbitrary code, escalate privileges, or perform unauthorized operations within the system's environment.
The operational impact of CVE-2020-7839 extends beyond simple command execution, as it can enable attackers to perform reconnaissance activities, establish persistent access, and potentially move laterally within network environments. The vulnerability affects systems that rely on MaEPSBroker for enterprise endpoint security management, potentially compromising the security posture of organizations that depend on this software for critical infrastructure protection. This flaw creates a pathway for attackers to gain elevated privileges and execute malicious commands that could result in data exfiltration, system disruption, or complete system compromise. The vulnerability is particularly dangerous in enterprise environments where the broker may operate with elevated permissions, amplifying the potential damage from successful exploitation.
Mitigation strategies for CVE-2020-7839 should focus on immediate remediation through software updates to versions that address the input validation deficiencies. Organizations should implement comprehensive input validation measures that sanitize all user-supplied data before processing, particularly for parameters that may be used in command execution contexts. Network segmentation and access controls should be enforced to limit exposure of vulnerable systems, while monitoring solutions should be deployed to detect anomalous command execution patterns. The remediation process must include thorough testing of updated software versions to ensure that the vulnerability has been properly addressed without introducing new operational issues. Security teams should also conduct comprehensive vulnerability assessments to identify other potential command injection points within their infrastructure, as this vulnerability type often indicates broader input validation weaknesses that require systematic addressing.