Directory Traversal Vulnerability in webfs: Remote File Access Risk
Summary
CVE-2003-0832: Directory traversal vulnerability in webfs before 1.20 allows remote attackers to read arbitrary files via .. (dot dot) sequences in a Hostname header. Affects webfs versions < 1.20. Fixed in 1.20. How to fix ↓
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Background
webfs is a lightweight web server designed for serving static files. It is commonly used in environments where simplicity and low resource consumption are prioritized. The package allows users to host files over HTTP, making it accessible for various applications. However, its design has made it susceptible to directory traversal attacks, which can lead to unauthorized access to sensitive files on the server.
Vulnerability Detail
The vulnerability, identified as CVE-2003-0832, arises from a directory traversal flaw in webfs versions prior to 1.20. This issue allows remote attackers to exploit the web server by sending specially crafted requests that include '..' (dot dot) sequences in the Hostname header. By doing so, attackers can potentially read arbitrary files on the server, leading to exposure of sensitive information and compromising the integrity of the system. The risk is particularly pronounced in environments where webfs is used to serve critical files without adequate security measures.
How To Fix
Minimum fixed version
1.20
This is the first release that contains the fix.
sudo apt-get install --only-upgrade webfsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If upgrading is not immediately feasible, consider implementing access controls to restrict access to the web server. This may include configuring firewalls to limit incoming connections or using a reverse proxy to filter requests. Additionally, monitor logs for any suspicious activity that may indicate attempts to exploit this vulnerability.
Conclusion
The directory traversal vulnerability in webfs poses a significant risk to systems using this package. Upgrading to version 1.20 or later is crucial to mitigate this risk. Additionally, utilizing tools like Vulert can help monitor for vulnerabilities in your software without requiring complex installations.
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FAQ
CVE-2003-0832 is a unique identifier for a directory traversal vulnerability found in webfs versions before 1.20, allowing unauthorized file access.
Check the version of your webfs installation. If it is below 1.20, it is vulnerable to CVE-2003-0832.
The primary risk is unauthorized access to sensitive files on the server, which can lead to data breaches and compromise system security.
Yes, you can use Vulert, which monitors open-source vulnerabilities in your software using a manifest file like package-lock.json. You can check your application for this vulnerability using the Vulert playground.
Implement access controls and monitor server logs for suspicious activity as a temporary measure until you can upgrade.
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