CVE-2018-6892 in CloudMe
Summary
by MITRE
An issue was discovered in CloudMe before 1.11.0. An unauthenticated remote attacker that can connect to the "CloudMe Sync" client application listening on port 8888 can send a malicious payload causing a buffer overflow condition. This will result in an attacker controlling the program's execution flow and allowing arbitrary code execution.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 06/26/2024
The vulnerability identified as CVE-2018-6892 represents a critical buffer overflow flaw in the CloudMe Sync client application that operates on port 8888. This issue affects versions prior to 1.11.0 and exposes a fundamental security weakness in the application's network handling mechanisms. The vulnerability arises from insufficient input validation and memory management within the client's network service implementation, creating an exploitable condition that allows remote attackers to manipulate the application's execution flow through carefully crafted malicious payloads.
The technical implementation of this vulnerability stems from the CloudMe Sync client's failure to properly validate incoming network data when processing connections on port 8888. When an unauthenticated remote attacker sends a specially crafted payload to this listening service, the application's buffer handling mechanisms become overwhelmed, leading to a classic buffer overflow condition. This flaw falls under the CWE-121 category of stack-based buffer overflow, where insufficient bounds checking allows an attacker to overwrite adjacent memory locations, ultimately compromising the program's execution flow control. The vulnerability's impact is amplified by the fact that no authentication is required to exploit this condition, making it particularly dangerous in networked environments.
From an operational perspective, this vulnerability creates a significant attack surface that allows remote code execution without any prior authentication or authorization. An attacker can leverage this flaw to gain complete control over the affected system running the CloudMe Sync client, potentially leading to data exfiltration, system compromise, or further lateral movement within a network. The attack vector is particularly concerning as it requires no credentials and can be exploited over the network, making it an attractive target for automated exploitation tools. The lack of authentication requirements means that any system with the CloudMe client running and exposed to the internet could be compromised, creating widespread potential impact across multiple user environments.
The mitigation strategy for CVE-2018-6892 involves immediate deployment of the patched version 1.11.0 or later, which addresses the buffer overflow condition through proper input validation and memory management. Organizations should also implement network segmentation to restrict access to port 8888, particularly by blocking external connections to this service. Additionally, network monitoring should be enhanced to detect unusual traffic patterns on port 8888 that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper input validation and memory safety practices in network services, aligning with ATT&CK technique T1059.007 for command and script interpreter usage and T1068 for exploit for privilege escalation. Security teams should also consider implementing network-based intrusion detection systems to identify and block malicious payloads attempting to exploit this specific buffer overflow condition, as the vulnerability's characteristics make it susceptible to automated exploitation.