CVE-2008-2161 in TFTP Server SP
Summary
by MITRE
Buffer overflow in TFTP Server SP 1.4 and 1.5 on Windows, and possibly other versions, allows remote attackers to execute arbitrary code via a long TFTP error packet. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 10/21/2024
The vulnerability identified as CVE-2008-2161 represents a critical buffer overflow flaw within the Trivial File Transfer Protocol TFTP Server version 1.4 and 1.5 running on Windows operating systems. This security weakness stems from inadequate input validation mechanisms within the TFTP server implementation, specifically when processing error packets transmitted during file transfer operations. The flaw exists in the server's handling of malformed or excessively long error messages that exceed the allocated buffer space, creating a condition where attacker-controlled data can overwrite adjacent memory locations in the process heap.
The technical exploitation of this vulnerability occurs when a remote attacker crafts a specially malformed TFTP error packet containing an oversized error message string. When the vulnerable TFTP server processes this packet, the insufficient buffer size validation allows the excessive data to overflow into adjacent memory regions, potentially corrupting critical program execution structures such as return addresses, stack pointers, or function pointers. This memory corruption can be leveraged to redirect program execution flow to attacker-controlled code, enabling arbitrary code execution with the privileges of the TFTP server process. The vulnerability is particularly dangerous because TFTP servers often run with elevated privileges and may be accessible from untrusted networks, making remote exploitation feasible without requiring authentication.
The operational impact of this vulnerability extends beyond simple code execution to encompass potential system compromise and data breach scenarios. Attackers exploiting this flaw can gain unauthorized access to systems running vulnerable TFTP servers, potentially leading to complete system takeover, privilege escalation, or lateral movement within network environments. The vulnerability affects not only the specific versions mentioned but likely extends to other versions of the TFTP server software, creating a widespread security risk across various network infrastructure components that rely on TFTP for file transfer operations. Organizations using TFTP servers for legitimate network operations such as router firmware updates, boot file distribution, or network management may find their systems vulnerable to exploitation.
Security mitigations for this vulnerability include immediate patching of affected TFTP server implementations to address the buffer overflow condition through proper input validation and bounds checking mechanisms. Network segmentation and access control measures should be implemented to restrict TFTP server accessibility to trusted network segments only, reducing the attack surface for remote exploitation attempts. Additionally, monitoring network traffic for suspicious TFTP error packet patterns and implementing intrusion detection systems can help identify potential exploitation attempts. Organizations should also consider disabling TFTP services entirely if they are not required for business operations, as TFTP's lack of authentication and encryption makes it inherently insecure. This vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and maps to ATT&CK technique T1195.001, covering the use of network protocols for execution and command and control communications. The vulnerability demonstrates the importance of input validation and memory safety practices in network service implementations, as outlined in the OWASP Top 10 and NIST Cybersecurity Framework guidelines for secure software development practices.