CVE-2020-3344 in AMP for Endpoints Linux
Summary
by MITRE
A vulnerability in Cisco AMP for Endpoints Linux Connector Software and Cisco AMP for Endpoints Mac Connector Software could allow an authenticated, local attacker to cause a buffer overflow on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted packet to an affected device. A successful exploit could allow the attacker to cause the Cisco AMP for Endpoints service to crash and restart.
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Analysis
by VulDB Data Team • 10/19/2020
This vulnerability resides in Cisco AMP for Endpoints connector software versions running on linux and mac operating systems, representing a critical buffer overflow flaw that stems from inadequate input validation mechanisms. The vulnerability specifically affects the network communication protocols utilized by the endpoint protection software, creating a pathway for authenticated local attackers to manipulate system memory through crafted packet delivery. The root cause of this issue can be classified under CWE-121, which encompasses stack-based buffer overflow conditions, and potentially CWE-787, representing out-of-bounds write vulnerabilities that occur when data is written beyond the boundaries of a fixed-length buffer.
The exploitation of this vulnerability requires an attacker to possess local authentication credentials and the ability to send specially crafted network packets to the target device. When the vulnerable software processes these malformed packets, the insufficient input validation allows memory corruption to occur, resulting in the Cisco AMP for Endpoints service experiencing a crash and subsequent restart. This behavior aligns with the ATT&CK technique T1499.004, which describes the use of service stoppage to disrupt system operations, and demonstrates how buffer overflow vulnerabilities can be leveraged to create denial of service conditions within endpoint protection frameworks. The impact extends beyond simple service disruption as it undermines the integrity of the endpoint security infrastructure, potentially creating windows of opportunity for further attacks.
From an operational perspective, this vulnerability compromises the reliability and availability of endpoint protection services that organizations depend upon for security monitoring and threat detection. The automatic restart of the service may temporarily restore functionality but does not address the underlying security breach, leaving systems potentially exposed to continued exploitation attempts. Organizations utilizing Cisco AMP for Endpoints may experience service interruptions that could mask actual security incidents or prevent proper logging of malicious activities. The vulnerability's local authentication requirement reduces the attack surface compared to remote exploits, but it still represents a significant risk within environments where insider threats or compromised local accounts exist. Security teams must consider this vulnerability as part of their broader endpoint security strategy, particularly when assessing the robustness of their defense-in-depth approaches. The issue demonstrates how even security tools designed to protect against threats can themselves contain vulnerabilities that create potential attack vectors. Organizations should prioritize patch management procedures to address this vulnerability promptly and implement monitoring to detect potential exploitation attempts, while also considering the broader implications for their endpoint security architecture and incident response capabilities.
This vulnerability highlights the importance of input validation and memory safety practices in security software development, particularly for components that handle network communications. The flaw serves as a reminder that security tools themselves can become attack surfaces when not properly secured against buffer overflow conditions and other memory corruption vulnerabilities. The remediation efforts should focus on implementing proper bounds checking, using safe string handling functions, and conducting thorough code reviews to prevent similar issues in future software releases. Organizations should also consider implementing network segmentation and access controls to limit local authentication capabilities where possible, reducing the potential impact of such vulnerabilities. The vulnerability underscores the necessity of maintaining up-to-date security software and the importance of vulnerability assessment programs that identify and address weaknesses in endpoint protection systems before they can be exploited by malicious actors.