CVE-2020-3343 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.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 10/19/2020
The vulnerability identified as CVE-2020-3343 represents a critical buffer overflow flaw within Cisco's endpoint protection solutions, specifically affecting both Linux and Mac operating systems. This security weakness resides in the Cisco AMP for Endpoints connector software implementations, where inadequate input validation mechanisms fail to properly sanitize incoming data packets. The flaw manifests when the software processes malformed network traffic without sufficient boundary checks, creating an environment where maliciously crafted input can exceed allocated memory buffers and overwrite adjacent memory regions.
The technical exploitation of this vulnerability requires an authenticated local attacker who can send specifically crafted packets to the targeted device. This attack vector aligns with CWE-121, which describes stack-based buffer overflow conditions, and demonstrates how insufficient validation of input data can lead to memory corruption. The attacker's payload must be carefully constructed to trigger the buffer overflow condition, typically by sending data exceeding the buffer's allocated size. When the vulnerable software attempts to process this malformed input, it overwrites critical memory locations, potentially leading to arbitrary code execution or service disruption.
The operational impact of this vulnerability extends beyond simple service interruption, as it provides an attacker with the capability to cause persistent disruption of endpoint protection services. When successfully exploited, the buffer overflow results in the Cisco AMP for Endpoints service crashing and automatically restarting, creating a denial of service condition that undermines the security posture of the affected system. This disruption directly violates the availability principles of the CIA triad and can be leveraged as part of broader attack campaigns. The restart behavior may also provide opportunities for attackers to exploit additional vulnerabilities or establish persistence mechanisms, as the service restart process may not properly validate state information.
Mitigation strategies for CVE-2020-3343 should prioritize immediate software updates from Cisco, as the vendor has released patches addressing this specific buffer overflow vulnerability. Organizations must implement network segmentation and access controls to limit local network access to affected systems, reducing the attack surface for authenticated local exploitation. Additionally, implementing monitoring solutions to detect unusual service restart patterns or network traffic anomalies can help identify potential exploitation attempts. The vulnerability's classification under ATT&CK technique T1499.004, which covers network denial of service attacks, underscores the importance of maintaining robust endpoint protection while also implementing network-level controls. Security teams should conduct comprehensive vulnerability assessments to identify all instances of the affected software and ensure timely patch deployment across all endpoints.