PYSEC-2010-7

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PYSEC-2010-7

Summary:

Details: Race condition in the FTPHandler class in ftpserver.py in pyftpdlib before 0.5.1 allows remote attackers to cause a denial of service (daemon outage) by establishing and then immediately closing a TCP connection, leading to the accept function having an unexpected return value of None, a different vulnerability than CVE-2010-3494.

References: http://code.google.com/p/pyftpdlib/source/detail?r=439, https://bugs.launchpad.net/zodb/+bug/135108, http://www.openwall.com/lists/oss-security/2010/09/24/3, http://code.google.com/p/pyftpdlib/issues/detail?id=91, http://code.google.com/p/pyftpdlib/source/diff?spec=svn439&r=439&format=side&path=/trunk/pyftpdlib/ftpserver.py, http://bugs.python.org/issue6706, http://code.google.com/p/pyftpdlib/source/browse/trunk/HISTORY, http://www.openwall.com/lists/oss-security/2010/09/09/6, http://www.openwall.com/lists/oss-security/2010/09/22/3, http://www.openwall.com/lists/oss-security/2010/09/11/2, https://github.com/advisories/GHSA-mpg6-rgp4-35rr