CVE-2022-39345: Gin-vue-admin Path Traversal and File Upload Vulnerability Exploit

Gin-vue-admin is a full stack, front-end and back-end separated, web management system based on the popular Vue.js and Gin Gonic frameworks, providing an efficient and customizable solution for developers to create their administration systems. Unfortunately, prior to version 2.5.4, Gin-vue-admin is vulnerable to path traversal and file upload attacks, which can lead to the upload of malicious files on the server-side. This post will detail the exploit, its implications, and the necessary mitigation steps.

Vulnerability Details

The vulnerability in Gin-vue-admin, identified as CVE-2022-39345, is a direct consequence of the unsafe handling of file paths when uploading a new resource. This oversight can result in arbitrary file uploads, granting an attacker the ability to traverse up the directory tree and place malicious files in unintended locations within the server's file structure. Consequently, this can lead to various security breaches, including unauthorized access and remote code execution.

Affected Versions

All versions of Gin-vue-admin prior to 2.5.4 are affected by this flaw.

A simple code snippet showcasing the vulnerable behavior in Gin-vue-admin can be found below

// in upload handler
fileHeader, err := c.FormFile("file")
if err != nil {
   c.String(http.StatusBadRequest, fmt.Sprintf("get form error: %s", err.Error()))
   return
}
...
dst := filepath.Join("./public", fileHeader.Filename)
if err := c.SaveUploadedFile(fileHeader, dst); err != nil {
   c.String(http.StatusBadRequest, fmt.Sprintf("upload file error: %s", err.Error()))
   return
}
...

This code snippet presents an example of an unsafe file upload handling method, where the "fileHeader.Filename" (user-supplied input) is used in determining the final destination for the file. An attacker can manipulate this input to traverse directories and upload a crafted file to a more critical location within the server file system.

Mitigation Steps

To mitigate the risk of this exploit, it is strongly recommended to upgrade Gin-vue-admin to the latest version (2.5.4 or later), which contains a patch to address the vulnerability. Users can download the patched version from the official GitHub repository:

Gin-vue-admin Repository

Unfortunately, there are no alternative workarounds for this vulnerability other than upgrading to a secure version.

Conclusion

In summary, Gin-vue-admin prior to version 2.5.4 is affected by a dangerous path traversal and file upload vulnerability (CVE-2022-39345). Failure to address this flaw can lead to severe security breaches, including unauthorized access and remote code execution. It is crucial to promptly upgrade to a patched version (2.5.4 or later) to mitigate the threat and maintain the security of your administration systems.

Timeline

Published on: 10/25/2022 17:15:00 UTC
Last modified on: 10/26/2022 00:54:00 UTC