medium
5.9
CWE
330 682 400
Advisory Published
Updated

CVE-2020-14422

First published: Thu Jun 18 2020(Updated: )

A vulnerability was found in Lib/ipaddress.py in Python through 3.8.3 improperly computes hash values in the IPv4Interface and IPv6Interface classes, which might allow a remote attacker to cause a denial of service if an application is affected by the performance of a dictionary containing IPv4Interface or IPv6Interface objects, and this attacker can cause many dictionary entries to be created. References: <a href="https://bugs.python.org/issue41004">https://bugs.python.org/issue41004</a> <a href="https://github.com/python/cpython/pull/20956">https://github.com/python/cpython/pull/20956</a>

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/python3<0:3.6.8-18.el7
0:3.6.8-18.el7
redhat/python3<0:3.6.8-31.el8
0:3.6.8-31.el8
redhat/rh-python36-python<0:3.6.12-1.el6
0:3.6.12-1.el6
redhat/rh-python36-python-pip<0:9.0.1-5.el6
0:9.0.1-5.el6
redhat/rh-python36-python-virtualenv<0:15.1.0-3.el6
0:15.1.0-3.el6
redhat/rh-python36-python<0:3.6.12-1.el7
0:3.6.12-1.el7
redhat/rh-python36-python-pip<0:9.0.1-5.el7
0:9.0.1-5.el7
redhat/rh-python36-python-virtualenv<0:15.1.0-3.el7
0:15.1.0-3.el7
redhat/rh-python38-python<0:3.8.6-1.el7
0:3.8.6-1.el7
redhat/rh-python38-python-psutil<0:5.6.4-5.el7
0:5.6.4-5.el7
redhat/rh-python38-python-urllib3<0:1.25.7-6.el7
0:1.25.7-6.el7
Python Python>=3.0.0<3.5.10
Python Python>=3.6.0<3.6.12
Python Python>=3.7.0<3.7.9
Python Python>=3.8.0<3.8.4
openSUSE Leap=15.1
openSUSE Leap=15.2
Fedoraproject Fedora=31
Fedoraproject Fedora=32
Oracle Enterprise Manager Ops Center=12.4.0.0
ubuntu/python3.4<3.4.3-1ubuntu1~14.04.7+
3.4.3-1ubuntu1~14.04.7+
ubuntu/python3.8<3.8.2-1ubuntu1.2
3.8.2-1ubuntu1.2
ubuntu/python3.8<3.8.4-1
3.8.4-1
ubuntu/python3.5<3.5.2-2ubuntu0~16.04.11
3.5.2-2ubuntu0~16.04.11
ubuntu/python3.6<3.6.9-1~18.04ubuntu1.1
3.6.9-1~18.04ubuntu1.1
debian/python-ipaddress<=1.0.17-1<=1.0.23-1
1.0.17-1+deb10u1
debian/python2.7
2.7.16-2+deb10u1
2.7.16-2+deb10u4
2.7.18-8+deb11u1
debian/python3.7
3.7.3-2+deb10u3
3.7.3-2+deb10u7

Remedy

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))) ```

Remedy

https://github.com/python/cpython/commit/dc8ce8ead182de46584cc1ed8a8c51d48240cbd5

Remedy

https://github.com/python/cpython/commit/cfc7ff8d05f7a949a88b8a8dd506fb5c1c30d3e9

Remedy

https://github.com/python/cpython/commit/b98e7790c77a4378ec4b1c71b84138cb930b69b7

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Parent vulnerabilities

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Frequently Asked Questions

  • What is the vulnerability ID for this issue?

    The vulnerability ID for this issue is CVE-2020-14422.

  • What is the severity of CVE-2020-14422?

    The severity of CVE-2020-14422 is medium with a CVSS score of 5.9.

  • Which versions of Python are affected by this vulnerability?

    Python versions up to and including 3.8.3 are affected by this vulnerability.

  • How does this vulnerability impact applications?

    This vulnerability could allow a remote attacker to cause a denial of service if an application is affected by the performance of a dictionary containing IPv4Interface or IPv6Interface objects.

  • Are there any references for this vulnerability?

    Yes, you can find more information about this vulnerability at the following references: [1], [2], [3].

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