CVE-2001-1265 in alphaWorks TFTP Server
Summary
by MITRE
Directory traversal vulnerability in IBM alphaWorks Java TFTP server 1.21 allows remote attackers to conduct unauthorized operations on arbitrary files via a .. (dot dot) attack.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 05/25/2019
The vulnerability identified as CVE-2001-1265 represents a critical directory traversal flaw within IBM alphaWorks Java TFTP server version 1.21. This security weakness fundamentally stems from insufficient input validation mechanisms that fail to properly sanitize file path references submitted by remote clients. The flaw specifically manifests when the server processes TFTP requests containing directory traversal sequences such as .. (dot dot) notation, which allows attackers to navigate outside the intended directory structure and access arbitrary files on the underlying file system. This vulnerability operates at the application layer and specifically targets the file access controls implemented within the TFTP server implementation, making it particularly dangerous for environments where sensitive data might be stored on the same system hosting the vulnerable service.
The technical exploitation of this vulnerability follows a well-established pattern that aligns with CWE-22 - Improper Limitation of a Pathname to a Restricted Directory. Attackers can construct malicious TFTP requests that include traversal sequences in file names or paths, enabling them to access files outside the designated TFTP root directory. When the server processes these requests without proper validation, it effectively allows unauthorized access to the entire file system hierarchy, potentially exposing configuration files, user data, system binaries, or other sensitive resources. The vulnerability is particularly concerning because TFTP servers typically run with elevated privileges and may have access to system-critical files that should remain protected from unauthorized access. This type of attack falls under the ATT&CK technique T1078 - Valid Accounts, as it often requires no additional privilege escalation once the traversal path is successfully exploited.
The operational impact of CVE-2001-1265 extends beyond simple unauthorized file access to encompass potential system compromise and data exfiltration scenarios. Remote attackers can leverage this vulnerability to read sensitive system files, potentially obtaining passwords, configuration details, or other confidential information that could facilitate further attacks. The vulnerability also enables attackers to potentially modify or delete files within the TFTP server's accessible directories, leading to service disruption or data corruption. In enterprise environments, this flaw could result in significant security breaches, particularly when the TFTP server is used to store or transfer system configuration files or other sensitive data. The attack vector is straightforward and requires minimal technical expertise, making it a popular target for both automated scanning tools and manual exploitation attempts. Organizations running this vulnerable version of the IBM alphaWorks Java TFTP server face substantial risk of unauthorized access to their file systems and potential compromise of their overall security posture. The vulnerability's persistence in the software ecosystem highlights the importance of regular security updates and proper input validation practices in network services.
Mitigation strategies for CVE-2001-1265 primarily focus on immediate remediation through software updates and configuration hardening. The most effective approach involves upgrading to a patched version of the IBM alphaWorks Java TFTP server that properly implements input validation and path sanitization mechanisms. Organizations should also consider implementing network segmentation to isolate TFTP services from critical systems and restrict access to authorized users only. Additional defensive measures include configuring the TFTP server to operate with minimal required privileges, implementing proper file system access controls, and monitoring for suspicious file access patterns. Network-based mitigations such as firewall rules that restrict TFTP port access to trusted networks can provide additional protection layers. The vulnerability serves as a reminder of the critical importance of validating all user inputs in network services and implementing proper access controls to prevent unauthorized file system navigation. Security teams should conduct regular vulnerability assessments to identify and remediate similar weaknesses in other network services and applications that may be susceptible to directory traversal attacks.