CVE-2014-3913 in AccessNow Server
Summary
by MITRE
Stack-based buffer overflow in AccessServer32.exe in Ericom AccessNow Server allows remote attackers to execute arbitrary code via a request for a non-existent file.
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Analysis
by VulDB Data Team • 12/16/2024
The vulnerability identified as CVE-2014-3913 represents a critical stack-based buffer overflow flaw within the AccessServer32.exe component of Ericom AccessNow Server version 3.2. This vulnerability resides in the server's handling of file access requests and specifically affects the processing of non-existent file requests. The flaw manifests when the application attempts to handle malformed or specially crafted requests for files that do not exist within its file system, creating a condition where insufficient bounds checking allows an attacker to overwrite adjacent memory locations on the stack. Such buffer overflow conditions typically occur when the application writes more data to a fixed-length memory buffer than it can accommodate, leading to corruption of adjacent memory segments including return addresses and control information. The vulnerability is classified under CWE-121 Stack-based Buffer Overflow, which is a well-documented weakness in software development practices that directly relates to improper handling of input data within stack-allocated buffers. This particular implementation flaw enables remote code execution capabilities because the buffer overflow can be leveraged to overwrite the instruction pointer or other critical control data, allowing an attacker to redirect program execution to malicious code.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass a wide range of potential security implications within enterprise environments that utilize Ericom AccessNow Server. Attackers exploiting this vulnerability can gain unauthorized access to systems, escalate privileges, and potentially establish persistent backdoors within network infrastructure. The remote nature of the attack means that exploitation can occur from any location on the internet without requiring physical access or local network presence, making it particularly dangerous for organizations that expose the affected service to public networks. The vulnerability affects the core functionality of the AccessNow Server, which is designed to provide secure remote access solutions, creating a paradox where the very security feature becomes a potential attack vector. This flaw directly violates fundamental security principles and can lead to complete system compromise, data exfiltration, and unauthorized access to sensitive corporate resources. Organizations using this server software face significant risk exposure, particularly in environments where network segmentation is inadequate or where the server is directly accessible from untrusted networks.
Mitigation strategies for CVE-2014-3913 must address both immediate remediation and long-term security posture improvements within affected environments. The primary and most effective mitigation involves applying the vendor-provided security patches or updates that correct the buffer overflow vulnerability within AccessServer32.exe. Organizations should also implement network segmentation to limit access to the affected server, ensuring that only authorized systems can communicate with the AccessNow Server service. Network access control lists and firewalls should be configured to restrict access to the specific ports used by the server, particularly those associated with file access and remote connection protocols. Additionally, implementing intrusion detection systems and monitoring for anomalous file access patterns can help identify potential exploitation attempts. The vulnerability's classification under ATT&CK technique T1203 Exploitation for Client Execution highlights the importance of maintaining up-to-date security controls and conducting regular vulnerability assessments. Organizations should also consider implementing application whitelisting policies to prevent unauthorized execution of potentially malicious code, as well as establishing robust incident response procedures that include monitoring for signs of exploitation. Regular security awareness training for system administrators and network operators can help identify suspicious network activity that might indicate an exploitation attempt. The implementation of these layered defensive measures not only addresses the immediate threat posed by CVE-2014-3913 but also strengthens overall security resilience against similar vulnerabilities that may exist within the organization's broader attack surface.