CVE-2023-38817 in Echo.ac
Summary
by MITRE • 10/25/2023
An issue in Inspect Element Ltd Echo.ac v.5.2.1.0 allows a local attacker to gain privileges via a crafted command to the echo_driver.sys component.
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Analysis
by VulDB Data Team • 07/10/2024
The vulnerability identified as CVE-2023-38817 affects Echo.ac version 5.2.1.0, a software component developed by Inspect Element Ltd that interfaces with the echo_driver.sys kernel driver. This represents a critical local privilege escalation flaw that enables attackers with local system access to elevate their privileges to the highest possible level within the operating system. The vulnerability stems from improper input validation and privilege handling within the kernel-mode driver component, creating an exploitable condition that can be leveraged by malicious actors who already have user-level access to the system. The affected driver component serves as a bridge between user-mode applications and kernel-level system functions, making it a prime target for privilege escalation attacks that could potentially compromise the entire system.
The technical exploitation of this vulnerability occurs through a crafted command that is passed to the echo_driver.sys component, which fails to properly validate or sanitize the input before processing it within the kernel context. This lack of proper input validation creates a condition where malicious payloads can be executed with kernel-level privileges, bypassing standard operating system security mechanisms and access controls. The flaw likely involves improper handling of device ioctls or similar kernel interface mechanisms that allow arbitrary code execution in kernel space. According to CWE classification, this vulnerability maps to CWE-121, which describes stack-based buffer overflow conditions, or potentially CWE-122 for heap-based buffer overflows, though the specific nature of the vulnerability requires further analysis of the exact input processing mechanism within the driver. The attack vector is strictly local, meaning that an attacker must already have a foothold on the system, but the impact is severe as it allows for complete system compromise.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it provides attackers with complete control over the target system. Once successfully exploited, the attacker gains access to all system resources, can read and modify any file, execute arbitrary code, and potentially establish persistence mechanisms within the system. This vulnerability is particularly concerning in enterprise environments where local access might be obtained through social engineering, compromised credentials, or other initial compromise vectors. The kernel-level access provided by this exploit enables attackers to bypass endpoint protection solutions, manipulate system logs, and potentially escalate to domain-level privileges if the compromised system is part of a larger network infrastructure. The vulnerability affects all systems running the specific version of Echo.ac software, making it a widespread concern for organizations that have not yet patched or updated their systems.
Mitigation strategies for CVE-2023-38817 should focus on immediate patch deployment from the vendor, as the vulnerability requires kernel-level exploitation and cannot be addressed through traditional user-mode security measures. Organizations should implement comprehensive system monitoring to detect potential exploitation attempts, particularly focusing on unusual kernel-mode activity or unexpected privilege escalation events. The principle of least privilege should be enforced at the system level to limit the potential damage from successful exploitation, while also ensuring that only authorized personnel have local access to systems running vulnerable software. Security teams should consider implementing kernel-mode protection mechanisms such as driver signature enforcement, exploit protection policies, and regular system integrity checks. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence, specifically T1068 for local privilege escalation and T1543 for establishing persistence mechanisms. Organizations should also conduct thorough vulnerability assessments to identify other potentially vulnerable kernel drivers or system components that may present similar security risks, as this type of vulnerability often indicates broader security issues within the system's kernel interface design.