Attention all security enthusiasts and developers using Lanyulei Ferry: a critical vulnerability has been discovered in the software, which could lead to some serious issues! Classified as CVE-2022-3939, this vulnerability affects an unknown functionality of the file apis/public/file.go of the API component. The manipulation of the “file” argument results in a potentially dangerous path traversal that can be initiated remotely.

Exploit Details

This security flaw in Lanyulei Ferry’s API component results from improper handling of certain crafted requests containing the "file" argument. Malicious users can take advantage of this vulnerability by tricking the system into fetching files at arbitrary locations and potentially gain unauthorized access to sensitive data. Since the attack can be carried out from a remote location, it poses a serious risk to all systems running the vulnerable component.

A quick code snippet illustrating the problematic code (found in apis/public/file.go)

func GetFile(c *gin.Context) {
    file := c.Query("file")
    filePath := "/data/.../"
    fullPath := filePath + file
    c.Header("Content-Disposition", "attachment; filename="+filepath.Base(fullPath))

The above code snippet demonstrates that the file parameter value directly concatenates with the filePath, potentially allowing a path traversal attack if it can contain a "../" sequence.

Vulnerability Database Identifier (VDB)

The vulnerability in question has been assigned the identifier VDB-213446, making it easier for researchers, developers, and security teams to track, report, and manage the issue more effectively.

Refer to the Original Source

Though we have provided a brief description of the vulnerability and its impact, it is crucial to refer to the original source for a complete understanding of the issue, its potential risks, and any updates on mitigation or patches that may become available. You can find the official advisory, technical details, and other relevant information on the National Vulnerability Database (NVD) website.


CVE-2022-3939, a critical path traversal vulnerability discovered in Lanyulei Ferry’s API component, poses a significant threat to users and systems utilizing the vulnerable software. To ensure the security of your systems, it is essential to stay vigilant and keep an eye out for updates in the National Vulnerability Database (NVD) and Lanyulei Ferry’s official channels for information on patches or other security measures.

As cybersecurity remains an ever-evolving field, it is crucial for developers and users alike to stay informed of the latest vulnerabilities and exploits. Keep your systems updated, apply necessary patches, and practice good security hygiene to minimize the risks associated with cybersecurity threats like CVE-2022-3939.


Published on: 11/11/2022 07:15:00 UTC
Last modified on: 11/15/2022 21:30:00 UTC