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CVE-2024-46483 is an integer overflow vulnerability in Xlight FTP Server versions prior to 3.9.4.3, specifically in the packet parsing logic of the SFTP server component. The vulnerability arises when the server processes SFTP packets and fails to properly validate integer values, leading to an integer overflow. This, in turn, can result in a heap overflow with attacker-controlled content, potentially allowing for arbitrary code execution.
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This repository contains a proof-of-concept exploit for CVE-2024-46483, a pre-authentication heap overflow vulnerability in Xlight SFTP server versions 3.9.4.2 and earlier. The exploit is implemented in Python using the paramiko library. The main exploit file, 'exploit.py', patches the paramiko Message class to send a maliciously crafted string length during the SSH handshake, triggering an integer overflow in the target server's memory allocation logic. This can result in a heap overflow (on 32-bit systems) or an out-of-bounds read (on 64-bit systems), leading to denial of service or potential code execution. The exploit targets the SFTP service over the network (default port 22) and is configured to attack 'localhost' by default, but can be modified to target remote servers. The repository also includes a README.md with detailed vulnerability analysis and a requirements.txt specifying the paramiko dependency.
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