CVE-2008-7262: Directory Traversal Vulnerabilities in pyftpdlib
Summary
CVE-2008-7262: Multiple directory traversal vulnerabilities in FTPServer.py in pyftpdlib before 0.3.0 allow remote authenticated users to access arbitrary files and directories via vectors involving a symlink in a pathname to a (1) CWD... 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 allows developers to create custom FTP servers with ease. However, versions prior to 0.3.0 are vulnerable to multiple directory traversal vulnerabilities.
Vulnerability Detail
The vulnerability arises due to insufficient input validation in the FTPServer.py file of pyftpdlib. Remote authenticated users can exploit these vulnerabilities by manipulating symlinks in certain commands (CWD, DELE, STOR, or RETR) to access arbitrary files and directories on the server. This can lead to unauthorized access, disclosure of sensitive information, and potential compromise of the server.
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 possible workaround is to implement input validation and sanitization in the affected commands. This can be done by checking the provided path against a whitelist of allowed directories or by using a secure file access mechanism that prevents directory traversal attacks.
Conclusion
The directory traversal vulnerabilities in pyftpdlib versions prior to 0.3.0 can be exploited by remote authenticated users to access arbitrary files and directories on the server. It is crucial to upgrade to the latest version or implement the recommended workarounds to mitigate the risk of unauthorized access and potential compromise. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
pyftpdlib is a Python FTP server library that allows developers to create custom FTP servers.
Versions prior to 0.3.0 are affected by these directory traversal vulnerabilities.
An attacker with remote authenticated access can manipulate symlinks in certain FTP commands to access arbitrary files and directories on the server.
These vulnerabilities can lead to unauthorized access, disclosure of sensitive information, and potential compromise of the FTP server.
Yes, implementing input validation and sanitization in the affected commands can help mitigate the vulnerabilities.
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