GHSA-62xg-239j-vxg7

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in pyftpdlib

Source: GitHub Advisory Database (reviewed) Moderate CVE-2009-5011

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pyftpdlib	< 0.5.2	0.5.2

Details

As written in the advisory (Markdown source, shown as plain text).

Race condition in the FTPHandler class in ftpserver.py in pyftpdlib before 0.5.2 allows remote attackers to cause a denial of service (daemon outage) by establishing and then immediately closing a TCP connection, leading to the getpeername function having an ENOTCONN error, a different vulnerability than CVE-2010-3494.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2009-5011 advisory
https://github.com/giampaolo/pyftpdlib package
https://github.com/pypa/advisory-database/tree/main/vulns/pyftpdlib/PYSEC-2010-8.yaml web
http://code.google.com/p/pyftpdlib/issues/detail?id=100 web
http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY web
http://code.google.com/p/pyftpdlib/source/detail?r=543 web
http://code.google.com/p/pyftpdlib/source/diff?spec=svn543&r=543&format=side&path=/trunk/pyftpdlib/ftpserver.py web