Path Traversal Vulnerability in sapper
Summary
GHSA-f3vw-587g-r29g: Path Traversal in sapper. Affects sapper versions < 0.27.11. Fixed in 0.27.11. How to fix ↓
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Background
sapper is an open-source framework for building web applications with Svelte. It provides server-side rendering and code-splitting capabilities, making it efficient and performant. However, versions prior to 0.27.11 are vulnerable to a Path Traversal vulnerability. This vulnerability allows an attacker to access sensitive files on the server by exploiting URL-encoded ../ in HTTP requests.
Vulnerability Detail
The Path Traversal vulnerability in sapper arises from insufficient input validation. By including URL-encoded ../ in the request, an attacker can traverse the file system and access files that should be protected. This can lead to unauthorized disclosure of sensitive information, such as configuration files, user data, or even system files. The impact of this vulnerability depends on the specific files that can be accessed and the privileges of the user running the sapper application.
How To Fix
Minimum fixed version
0.27.11
This is the first release that contains the fix.
npm install sapper@0.27.11Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If upgrading to the latest version is not immediately feasible, a temporary workaround is to implement additional input validation and sanitization in the application code. Specifically, any user input that is used to construct file paths should be carefully validated to prevent the inclusion of ../ sequences. Additionally, it is important to ensure that the application runs with the least privileges necessary to limit the potential impact of a successful exploit.
Conclusion
The Path Traversal vulnerability in sapper can lead to unauthorized access to sensitive files on the server. It is crucial to upgrade to version 0.27.11 or later to mitigate this vulnerability. If immediate upgrade is not possible, implementing additional input validation and sanitization can serve as a temporary workaround. For further support and assistance in vulnerability remediation, you can reach out to DevNack.com.
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FAQ
A Path Traversal vulnerability, also known as Directory Traversal, occurs when an attacker is able to access files or directories outside of the intended scope. This is typically achieved by manipulating input that is used to construct file paths, such as adding ../ sequences to traverse up the directory structure.
With a Path Traversal vulnerability in sapper, an attacker can potentially access sensitive files on the server. This could include configuration files, user data, or even system files. The impact of the vulnerability depends on the specific files that can be accessed and the privileges of the user running the sapper application.
You can test your sapper application by sending a specially crafted HTTP request containing URL-encoded ../ sequences. For example, you can use the following command: curl -vvv http://localhost:3000/client/750af05c3a69ddc6073a/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/etc/passwd. If the response includes sensitive information, your application is vulnerable.
Yes, if upgrading to the latest version of sapper is not immediately feasible, you can implement additional input validation and sanitization in your application code. Ensure that any user input used to construct file paths is carefully validated to prevent the inclusion of ../ sequences. Additionally, running the application with the least privileges necessary can help limit the potential impact of a successful exploit.
You can find more information about the sapper framework on the official documentation website at https://sapper.svelte.dev. The documentation provides detailed guides, examples, and API references to help you understand and use sapper effectively.
