CVE-2008-7262: Directory Traversal in pyftpdlib
Summary
CVE-2008-7262: Directory traversal in pyftpdlib. Affects pyftpdlib versions < 0.3.0. Fixed in 0.3.0. How to fix ↓
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Background
pyftpdlib is a Python FTP server library that provides a high-level interface for implementing FTP servers. It is commonly used to create custom FTP servers or add FTP functionality to existing applications. The library allows users to authenticate and interact with the server using FTP commands. However, prior to version 0.3.0, pyftpdlib is vulnerable to multiple directory traversal vulnerabilities.
Vulnerability Detail
The vulnerability in pyftpdlib allows remote authenticated users to access arbitrary files and directories by exploiting directory traversal vulnerabilities. These vulnerabilities occur when the server fails to properly sanitize user-supplied input, allowing attackers to navigate outside of the intended directory structure. By using a symlink in a pathname to a CWD, DELE, STOR, or RETR command, an attacker can bypass access restrictions and retrieve or modify sensitive files on the server. This can lead to unauthorized access, data leakage, or even remote code execution depending on the specific files and permissions involved.
How To Fix
Minimum fixed version
0.3.0
This is the first release that contains the fix.
pip install --upgrade "pyftpdlib==0.3.0"Tip — 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 measures within the application using pyftpdlib. This can include checking for and blocking any attempts to navigate outside of the intended directory structure, as well as ensuring that user-supplied input is properly sanitized before processing it as part of FTP commands.
Conclusion
In conclusion, the directory traversal vulnerability in pyftpdlib allows remote authenticated users to access arbitrary files and directories. Upgrading to version 0.3.0 or later is the recommended solution to fix the vulnerability. Implementing additional input validation and sanitization measures can serve as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
pyftpdlib is a Python FTP server library that provides a high-level interface for implementing FTP servers.
Directory traversal is a vulnerability that allows an attacker to access files and directories outside of the intended directory structure.
The vulnerability can be exploited by using a symlink in a pathname to a CWD, DELE, STOR, or RETR command, allowing an attacker to navigate outside of the intended directory structure and access arbitrary files and directories.
The vulnerability can lead to unauthorized access, data leakage, or even remote code execution depending on the specific files and permissions involved.
To protect your application, it is recommended to upgrade to pyftpdlib version 0.3.0 or later. Additionally, implementing proper input validation and sanitization measures can help mitigate the risk of directory traversal attacks.
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