CVE-2020-14422

A vulnerability was found in the way the ipaddress python module computes hash values in the IPv4Interface and IPv6Interface classes. This flaw allows an attacker to create many dictionary entries, due to the performance of a dictionary containing the IPv4Interface or IPv6Interface objects, possibly resulting in a denial of service. The highest threat from this vulnerability is to system availability.

In Red Hat Enterprise Linux, python3 includes the ipaddress module by default, while for python2 a separate package, python-ipaddress, needs to be installed for the module to be used. Moreover, the ipaddress module is included in other packages as well, like python-pip.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

As a short term solution, if your application is using the IPv4Interface/IPv6Interface classes as keys of a dictionary, it is possible to patch the hash method of those classes to not be constant.

IPv4Interface.__hash__ = lambda self: hash((self._ip, self._prefixlen, int(self.network.network_address)))
IPv6Interface.__hash__ = lambda self: hash((self._ip, self._prefixlen, int(self.network.network_address)))