Executive Summary

CVE-2025-68705 is a path traversal vulnerability in RustFS versions 1.0.0-alpha.13 to 1.0.0-alpha.78, specifically in the /rustfs/rpc/read_file_stream endpoint. The vulnerability arises because the code concatenates user-supplied file paths without proper canonicalization or boundary checks, allowing attackers to escape the intended directory and access arbitrary files on the system. This happens due to insufficient validation of path inputs, enabling traversal sequences like '../' to access files outside the allowed directories. The issue was patched in version 1.0.0-alpha.79 by introducing stricter path validation and error handling to prevent such unauthorized access. [1, 2]

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Impact Analysis

This vulnerability can have severe impacts including unauthorized arbitrary file reads, leading to disclosure of sensitive system files such as /etc/passwd, /etc/hosts, and /etc/hostname. This can result in full user account enumeration, network configuration disclosure, and leakage of system information. There is also a suspected risk of arbitrary file writes, which could compromise system integrity by modifying critical files like SSH keys, application secrets, cron jobs, and system binaries. Additionally, the vulnerability can cause denial-of-service conditions through directory enumeration and recursive traversal attacks. Exploitation requires network access and knowledge of the RPC secret key, but if the secret is leaked or default, the attack becomes trivial. [2]

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Detection Guidance

Detection of this vulnerability involves monitoring for attempts to exploit the path traversal flaw in the /rustfs/rpc/read_file_stream endpoint. Since exploitation requires a valid RPC secret key and crafted path traversal payloads, detection can include auditing logs for unusual or unauthorized file read requests containing directory traversal sequences like '../'. Additionally, the patch introduced health check improvements that generate unique test object names dynamically and elevate logging levels to warn on disk health check failures, which can help identify abnormal disk access patterns. Specific commands are not provided in the resources, but monitoring HTTP requests to the vulnerable endpoint and inspecting logs for suspicious path parameters or failed health checks with warnings is recommended. [1, 2]

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Mitigation Strategies

Immediate mitigation steps include upgrading RustFS to version 1.0.0-alpha.79 or later, where the vulnerability is patched. The patch enforces stricter path validation by implementing path canonicalization and rejecting dangerous path components such as '..' or absolute paths. Additional recommended mitigations are rotating the RPC secret key to prevent unauthorized access, enabling audit logging and rate limiting on the vulnerable endpoint, and applying network segmentation to limit exposure. Long-term mitigations include running RustFS in a chroot jail and applying least privilege principles. [1, 2]

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Compliance Impact

The vulnerability allows attackers to perform arbitrary file reads, including sensitive system files and potentially application secrets, SSH keys, and user data. This exposure of sensitive information can lead to violations of data protection regulations such as GDPR and HIPAA, which require safeguarding personal and sensitive data against unauthorized access. Therefore, exploitation of this vulnerability could result in non-compliance with these standards due to confidentiality breaches and inadequate access controls. [2]

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