high
7.5
CWE
835 20
Advisory Published
Updated

CVE-2019-20907: Input Validation

First published: Tue Dec 10 2019(Updated: )

In Lib/tarfile.py in Python through 3.8.3, an attacker is able to craft a TAR archive leading to an infinite loop when opened by tarfile.open, because _proc_pax lacks header validation.

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

Affected SoftwareAffected VersionHow to fix
redhat/python<0:2.7.5-90.el7
0:2.7.5-90.el7
redhat/python3<0:3.6.8-18.el7
0:3.6.8-18.el7
redhat/python<0:2.7.5-64.el7_4
0:2.7.5-64.el7_4
redhat/python<0:2.7.5-84.el7_6
0:2.7.5-84.el7_6
redhat/python<0:2.7.5-88.el7_7
0:2.7.5-88.el7_7
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/python27-python<0:2.7.18-2.el7
0:2.7.18-2.el7
redhat/python27-python-pip<0:8.1.2-6.el7
0:8.1.2-6.el7
redhat/python27-python-virtualenv<0:13.1.0-4.el7
0:13.1.0-4.el7
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
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
debian/python3.9
3.9.2-1
ubuntu/python2.7<2.7.17-1~18.04ubuntu1.1
2.7.17-1~18.04ubuntu1.1
ubuntu/python2.7<2.7.18-1~20.04.1
2.7.18-1~20.04.1
ubuntu/python2.7<2.7.6-8ubuntu0.6+
2.7.6-8ubuntu0.6+
ubuntu/python2.7<2.7.12-1ubuntu0~16.04.12
2.7.12-1ubuntu0~16.04.12
ubuntu/python3.4<3.4.3-1ubuntu1~14.04.7+
3.4.3-1ubuntu1~14.04.7+
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
ubuntu/python3.8<3.8.2-1ubuntu1.2
3.8.2-1ubuntu1.2
ubuntu/python3.8<3.8.5-1
3.8.5-1
Python Python>=3.5.0<3.5.10
Python Python>=3.6.0<3.6.12
Python Python>=3.7.0<3.7.9
Python Python>=3.8.0<3.8.5
openSUSE Leap=15.1
openSUSE Leap=15.2
Debian Debian Linux=9.0
Fedoraproject Fedora=31
Fedoraproject Fedora=32
Canonical Ubuntu Linux=12.04
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=20.04
Netapp Active Iq Unified Manager Vsphere>=9.5
Netapp Cloud Volumes Ontap Mediator
Oracle ZFS Storage Appliance Kit=8.8

Remedy

https://github.com/python/cpython/pull/21454

Remedy

https://www.oracle.com/security-alerts/cpujan2021.html

Remedy

This flaw can be mitigated by not opening untrusted files with tarfile.

Remedy

https://github.com/python/cpython/commit/47a2955589bdb1a114d271496ff803ad73f954b8

Remedy

https://github.com/python/cpython/commit/79c6b602efc9a906c8496f3d5f4d54c54b48fa06

Remedy

https://github.com/python/cpython/commit/c55479556db015f48fc8bbca17f64d3e65598559

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2019-20907?

    CVE-2019-20907 is a vulnerability in Python that allows an attacker to craft a TAR archive leading to an infinite loop when opened by tarfile.open.

  • How severe is CVE-2019-20907?

    CVE-2019-20907 has a severity score of 7.5, which is considered high.

  • Which versions of Python are affected by CVE-2019-20907?

    Python versions 2.7.5 to 2.7.5-90.el7, 3.6.8 to 3.6.8-18.el7, and 3.8.0 to 3.8.3 are affected by CVE-2019-20907.

  • How can I fix CVE-2019-20907?

    To fix CVE-2019-20907, update your Python version to 2.7.5-91.el7, 3.6.8-19.el7, or 3.8.4 or later.

  • Where can I find more information about CVE-2019-20907?

    You can find more information about CVE-2019-20907 at the following references: [link 1], [link 2], [link 3].

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