CVE-2007-6739: Improper Input Validation in pyftpdlib
Summary
CVE-2007-6739: Improper Input Validation in pyftpdlib. Affects pyftpdlib versions < 0.2.0. Fixed in 0.2.0. 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 in Python applications to enable FTP functionality. However, versions before 0.2.0 are vulnerable to an improper input validation issue that can be exploited by remote attackers to cause a denial of service. This vulnerability arises from a lack of proper handling of long commands received by the FTP server.
Vulnerability Detail
The vulnerability (CVE-2007-6739) in pyftpdlib allows remote attackers to exploit the FTP server by sending excessively long commands. This can lead to a denial of service, causing the server to become unresponsive or crash. The lack of input validation allows the attacker to abuse the server's resources and disrupt its normal operation. The severity of this vulnerability is considered moderate, with a CVSS score of 5.3.
How To Fix
Minimum fixed version
0.2.0
This is the first release that contains the fix.
pip install --upgrade "pyftpdlib==0.2.0"Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no specific workaround mentioned for this vulnerability. However, as a general best practice, it is advisable to implement network-level protections such as firewalls and intrusion detection systems to mitigate the risk of remote attacks. Additionally, monitoring and analyzing network traffic can help identify and block any malicious attempts to exploit this vulnerability.
Conclusion
In conclusion, the vulnerability in pyftpdlib allows remote attackers to cause a denial of service by exploiting the improper input validation issue. To mitigate this risk, it is crucial to update to pyftpdlib version 0.2.0 or later. Implementing network-level protections and monitoring network traffic can also enhance the security posture. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The vulnerability allows remote attackers to cause a denial of service by sending long commands to the FTP server. This can result in the server becoming unresponsive or crashing, disrupting its normal operation.
You can use Vulert's playground (https://vulert.com/scanner) to check if your application is affected by this vulnerability. Simply upload your Pipfile.lock and Vulert will analyze it to identify any open-source vulnerabilities, including this one.
Yes, the CVSS score for this vulnerability is 5.3, indicating a moderate severity level.
While there are no known public exploits specifically targeting this vulnerability in pyftpdlib, it is still important to apply the recommended fix to mitigate the risk of potential exploitation.
For more information about this vulnerability, you can refer to the GitHub Security Advisory database entry at: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-5f3f-pg2c-cxcv/GHSA-5f3f-pg2c-cxcv.json
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