CVE-2006-6724 in Dream FTP Server
Summary
by MITRE
BolinTech Dream FTP Server 1.02 allows remote authenticated users, including anonymous users, to cause a denial of service (application crash) via a certain invalid PORT command.
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Analysis
by VulDB Data Team • 12/21/2024
The vulnerability identified as CVE-2006-6724 affects the BolinTech Dream FTP Server version 1.02, representing a significant security flaw that enables remote authenticated users to trigger application instability. This issue specifically manifests through improper handling of FTP protocol commands, particularly the PORT command which is used to establish data connections in FTP communications. The vulnerability exists within the server's command processing logic where it fails to adequately validate input parameters before executing operations. The flaw allows attackers to craft malicious PORT commands that, when processed by the vulnerable server, result in application crashes and subsequent denial of service conditions.
The technical nature of this vulnerability stems from inadequate input validation and error handling within the FTP server implementation. When the server receives an invalid PORT command, it does not properly sanitize or validate the command parameters, leading to memory corruption or unexpected execution paths that ultimately cause the application to terminate unexpectedly. This type of vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. The vulnerability operates at the application layer of the network stack, making it particularly dangerous as it can be exploited by both authenticated and anonymous users, significantly broadening the attack surface.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be leveraged by malicious actors to systematically degrade service availability for legitimate users. In enterprise environments, this could result in unauthorized access to critical data services, potential information leakage, or complete service unavailability for business operations. The vulnerability's accessibility to anonymous users makes it particularly concerning as it requires no prior authentication credentials to exploit. This characteristic aligns with ATT&CK technique T1499.004, which covers network denial of service attacks, and represents a classic example of how improper input validation can lead to system instability and service disruption.
Mitigation strategies for this vulnerability should include immediate application of vendor patches or updates to the Dream FTP Server software, as well as implementing network-level restrictions to limit FTP service access to trusted networks. Administrators should also consider implementing intrusion detection systems that can monitor for suspicious PORT command patterns and establish robust logging mechanisms to track unauthorized access attempts. The vulnerability demonstrates the critical importance of proper input validation and error handling in network services, as recommended by security frameworks such as the OWASP Top Ten and NIST cybersecurity guidelines. Organizations should conduct regular vulnerability assessments to identify similar flaws in other network services and implement defensive measures including network segmentation, access control lists, and regular security updates to prevent exploitation of similar vulnerabilities in their infrastructure.