CVE-2008-0673 in WinTin++
Summary
by MITRE
TinTin++ 1.97.9 and WinTin++ 1.97.9 open files on the basis of an inbound file-transfer request, before the user has an opportunity to decline the request, which allows remote attackers to truncate arbitrary files in the top level of a home directory.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 07/30/2021
The vulnerability identified as CVE-2008-0673 affects TinTin++ version 1.97.9 and WinTin++ version 1.97.9, representing a critical security flaw in telecommunications software designed for internet relay chat and multi-user dungeon applications. This issue resides within the file transfer functionality of these clients, specifically in how they handle inbound file transfer requests from remote parties. The vulnerability stems from a design flaw where the software automatically opens and begins processing files immediately upon receiving a transfer request without first presenting the user with an opportunity to accept or decline the transfer. This behavior violates fundamental security principles of user consent and explicit authorization for file operations. The flaw is categorized under CWE-20, which represents improper input validation, and more specifically relates to CWE-362, concurrent execution with inappropriate locks, as the software fails to implement proper synchronization mechanisms for file operations during transfer initiation.
The operational impact of this vulnerability is significant as it enables remote attackers to exploit the software's automatic file handling behavior to truncate arbitrary files located in the top level of a user's home directory. This truncation occurs because the software creates or opens files before user confirmation, allowing malicious actors to manipulate file contents or destroy data by truncating existing files to zero bytes. The attack vector requires minimal user interaction beyond initiating a file transfer request, making it particularly dangerous in environments where users may unknowingly accept transfers from untrusted sources. The vulnerability creates a privilege escalation scenario where remote attackers can modify or destroy files in the user's home directory without proper authorization, potentially affecting system integrity and availability. From an attack framework perspective, this vulnerability aligns with techniques described in the ATT&CK matrix under T1059 for command and scripting interpreter and T1490 for insecure file permissions, as it leverages improper file handling to achieve unauthorized modifications.
Mitigation strategies for CVE-2008-0673 require immediate software updates to patched versions of TinTin++ and WinTin++, as the vulnerability exists in the core file transfer implementation. System administrators should implement strict network controls to prevent unauthorized file transfers and establish monitoring protocols for suspicious file operations in user home directories. Users must be educated about the risks of accepting file transfers from untrusted sources and should be trained to verify all transfer requests before accepting them. The vulnerability demonstrates the critical importance of implementing proper user consent mechanisms for file operations and highlights the necessity of secure coding practices that prevent automatic file creation or modification without explicit user approval. Organizations should also consider implementing file integrity monitoring solutions to detect unauthorized truncation or modification of critical files in home directories. Additionally, network segmentation and firewall rules can be configured to restrict file transfer protocols and limit the attack surface for this type of vulnerability, ensuring that file transfer capabilities are properly controlled and monitored.