CVE-2010-20113 in EasyFTP Server
Summary
by MITRE • 08/22/2025
EasyFTP Server 1.7.0.11 and earlier contains a stack-based buffer overflow vulnerability in its HTTP interface. When processing a GET request to list.html, the server fails to properly validate the length of the path parameter. Supplying an excessively long value causes a buffer overflow on the stack, potentially corrupting control flow structures. The vulnerability is exposed through the embedded web server and does not require authentication due to default anonymous access. The issue was resolved in version 1.7.0.12, after which the product was renamed to UplusFtp.
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Analysis
by VulDB Data Team • 09/11/2025
The vulnerability identified as CVE-2010-20113 represents a critical stack-based buffer overflow flaw within EasyFTP Server version 1.7.0.11 and earlier releases. This vulnerability exists within the server's embedded HTTP interface, specifically when processing GET requests directed to the list.html resource. The flaw stems from inadequate input validation mechanisms that fail to properly constrain the length of the path parameter submitted by remote clients. The affected software architecture processes user-supplied data without sufficient bounds checking, creating an exploitable condition where malicious input can exceed allocated buffer space. This particular implementation vulnerability manifests as a classic stack overflow scenario where excessive data overwrites adjacent memory locations including return addresses and control flow structures. The security implications are exacerbated by the fact that this vulnerability operates through the embedded web server component, which by default permits anonymous access without requiring authentication credentials. Attackers can exploit this condition remotely without any prior authorization, making the vulnerability particularly dangerous in networked environments where unauthenticated access is permitted.
The technical exploitation of this buffer overflow vulnerability follows established patterns documented in common weakness enumeration CWE-121, which classifies stack-based buffer overflows as a fundamental memory safety issue. The flaw directly enables arbitrary code execution through control flow hijacking, where an attacker can overwrite the return address on the stack and redirect program execution to malicious payload code. The vulnerability's exposure through the HTTP interface means that exploitation can occur via standard web browser requests or automated tools designed to probe for such weaknesses. The default anonymous access configuration significantly broadens the attack surface since no authentication is required to initiate the malicious GET request that triggers the overflow condition. This configuration aligns with ATT&CK technique T1190, which describes the exploitation of vulnerabilities in network services to gain unauthorized access. The vulnerability's impact extends beyond simple denial of service to potentially provide full system compromise, as successful exploitation allows attackers to execute arbitrary commands with the privileges of the affected service process.
The operational impact of this vulnerability affects organizations running vulnerable versions of EasyFTP Server, particularly those with internet-facing FTP services or systems where anonymous access is enabled. The lack of authentication requirements means that any attacker with network access can potentially exploit the vulnerability, creating a significant risk for environments where FTP services are exposed to untrusted networks. Organizations may experience complete system compromise, data loss, or unauthorized access to sensitive information stored on the affected server. The vulnerability's resolution in version 1.7.0.12 demonstrates that the issue was properly addressed through input validation improvements and buffer length restrictions. However, the transition to UplusFtp following this fix indicates that the vendor recognized the severity of the issue and implemented a complete product rebranding as part of their security response. The remediation process requires organizations to upgrade to the patched version, which involves careful planning to ensure service availability during the update process. Security teams should prioritize identification and remediation of this vulnerability across their infrastructure, particularly in environments where FTP services are exposed to external networks or where anonymous access is permitted. The vulnerability serves as a reminder of the critical importance of input validation and proper memory management in network services, as well as the necessity of keeping software components updated to address known security flaws.