CVE-2020-8492
First published: Thu Jan 30 2020(Updated: )
Python is vulnerable to a denial of service, caused by a flaw in the urllib.request.AbstractBasicAuthHandler. By sending a specially crafted request, a remote attacker could exploit this vulnerability to cause a Regular Expression Denial of Service (ReDoS).
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/python3 | <0:3.6.8-17.el7 | 0:3.6.8-17.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 |
| Python Python | >=2.7.0<=2.7.17 | |
| Python Python | >=3.5.0<=3.5.9 | |
| Python Python | >=3.6.0<=3.6.10 | |
| Python Python | >=3.7.0<=3.7.6 | |
| Python Python | >=3.8.0<=3.8.1 | |
| openSUSE Leap | =15.1 | |
| Canonical Ubuntu Linux | =12.04 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =19.10 | |
| Canonical Ubuntu Linux | =20.04 | |
| Fedoraproject Fedora | =31 | |
| Fedoraproject Fedora | =32 | |
| Debian Debian Linux | =9.0 | |
| redhat/python | <3.8.3 | 3.8.3 |
| ubuntu/python3.4 | <3.4.3-1ubuntu1~14.04.7+ | 3.4.3-1ubuntu1~14.04.7+ |
| ubuntu/python3.5 | <3.5.2-2ubuntu0~16.04.10 | 3.5.2-2ubuntu0~16.04.10 |
| ubuntu/python3.6 | <3.6.9-1~18.04ubuntu1 | 3.6.9-1~18.04ubuntu1 |
| ubuntu/python3.7 | <3.7.5-2ubuntu1~18.04.2 | 3.7.5-2ubuntu1~18.04.2 |
| ubuntu/python3.7 | <3.7.5-2~19.10ubuntu1 | 3.7.5-2~19.10ubuntu1 |
| ubuntu/python3.8 | <3.8.0-3ubuntu1~18.04.2 | 3.8.0-3ubuntu1~18.04.2 |
| ubuntu/python3.8 | <3.8.2-1ubuntu1.1 | 3.8.2-1ubuntu1.1 |
| ubuntu/python3.8 | <3.8.2-1ubuntu1.1 | 3.8.2-1ubuntu1.1 |
| ubuntu/python2.7 | <2.7.17-1~18.04ubuntu1 | 2.7.17-1~18.04ubuntu1 |
| 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 | <2.7.12-1ubuntu0~16.04.11 | 2.7.12-1ubuntu0~16.04.11 |
| 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 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2020-8492 https://nvd.nist.gov/vuln/detail/CVE-2020-8492
- https://bugzilla.redhat.com/show_bug.cgi?id=1809065
- https://access.redhat.com/errata/RHSA-2020:3888
- https://access.redhat.com/errata/RHSA-2020:4433
- https://access.redhat.com/errata/RHSA-2020:4641
- https://access.redhat.com/errata/RHSA-2020:4285
- https://access.redhat.com/security/cve/cve-2020-8492
- https://exchange.xforce.ibmcloud.com/vulnerabilities/175462
- https://www.ibm.com/support/pages/node/6491661 (Advisory)
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.html
- https://bugs.python.org/issue39503
- https://github.com/python/cpython/pull/18284
- https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5@%3Ccommits.cassandra.apache.org%3E
- https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da@%3Ccommits.cassandra.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/
- https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.html
- https://security.gentoo.org/glsa/202005-09
- https://security.netapp.com/advisory/ntap-20200221-0001/
- https://usn.ubuntu.com/4333-1/
- https://usn.ubuntu.com/4333-2/
- https://launchpad.net/bugs/cve/CVE-2020-8492
- https://lists.apache.org/thread.html/rdb31a608dd6758c6093fd645aea3fbf022dd25b37109b6aaea5bc0b5%40%3Ccommits.cassandra.apache.org%3E
- https://lists.apache.org/thread.html/rfec113c733162b39633fd86a2d0f34bf42ac35f711b3ec1835c774da%40%3Ccommits.cassandra.apache.org%3E
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WOKDEXLYW5UQ4S7PA7E37IITOC7C56J/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APGWEMYZIY5VHLCSZ3HD67PA5Z2UQFGH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UESGYI5XDAHJBATEZN3MHNDUBDH47AS6/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1809067
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1809073
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1809068
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1809072
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1809069
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1809066
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1809071
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1809074
- https://bugs.python.org/issue38826
- https://github.com/python/cpython/commit/0b297d4ff1c0e4480ad33acae793fbaf4bf015b4
- https://github.com/python/cpython/commit/ea9e240aa02372440be8024acb110371f69c9d41
- https://github.com/python/cpython/commit/b57a73694e26e8b2391731b5ee0b1be59437388e
- https://github.com/python/cpython/commit/69cdeeb93e0830004a495ed854022425b93b3f3e
- https://security-tracker.debian.org/tracker/CVE-2020-8492
- https://ubuntu.com/security/notices/USN-4333-1
- https://ubuntu.com/security/notices/USN-4333-2
- https://ubuntu.com/security/notices/USN-4754-3
- https://ubuntu.com/security/notices/USN-5200-1
- https://www.cve.org/CVERecord?id=CVE-2020-8492
- https://nvd.nist.gov/vuln/detail/CVE-2020-8492
- https://ubuntu.com/security/CVE-2020-8492
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2020-8492.
What is the severity of CVE-2020-8492?
The severity of CVE-2020-8492 is medium.
What is the description of CVE-2020-8492?
CVE-2020-8492 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client.
Which software versions are affected by CVE-2020-8492?
Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 are affected by CVE-2020-8492.
How can I fix CVE-2020-8492?
To fix CVE-2020-8492, update Python to version 3.6.8-17.el7, 3.6.8-31.el8, 3.6.12-1.el6, 9.0.1-5.el6, 15.1.0-3.el6, 3.6.12-1.el7, 9.0.1-5.el7, or 15.1.0-3.el7, or Python to version 3.8.3.
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