CVE-2021-28861
First published: Mon Aug 22 2022(Updated: )
** DISPUTED ** Python 3.x through 3.10 has an open redirection vulnerability in lib/http/server.py due to no protection against multiple (/) at the beginning of URI path which may leads to information disclosure. NOTE: this is disputed by a third party because the http.server.html documentation page states "Warning: http.server is not recommended for production. It only implements basic security checks."
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/python3 | <0:3.6.8-48.el8_7.1 | 0:3.6.8-48.el8_7.1 |
| redhat/python3.9 | <0:3.9.14-1.el9 | 0:3.9.14-1.el9 |
| redhat/rh-python38-python | <0:3.8.14-1.el7 | 0:3.8.14-1.el7 |
| Python Python | >=3.0.0<3.7.14 | |
| Python Python | >=3.8.0<3.8.14 | |
| Python Python | >=3.9.0<3.9.14 | |
| Python Python | >=3.10.0<3.10.6 | |
| Python Python | =3.11.0-alpha1 | |
| Python Python | =3.11.0-alpha2 | |
| Python Python | =3.11.0-alpha3 | |
| Python Python | =3.11.0-alpha4 | |
| Python Python | =3.11.0-alpha5 | |
| Python Python | =3.11.0-alpha6 | |
| Python Python | =3.11.0-alpha7 | |
| Python Python | =3.11.0-beta1 | |
| Python Python | =3.11.0-beta2 | |
| Python Python | =3.11.0-beta3 | |
| Fedoraproject Fedora | =35 | |
| Fedoraproject Fedora | =36 | |
| Fedoraproject Fedora | =37 | |
| IBM Security Verify Access Docker | <=10.0.X | |
| IBM Security Verify Access | <=10.0.X | |
| ubuntu/python3.10 | <3.10.6-1~22.04.1 | 3.10.6-1~22.04.1 |
| ubuntu/python3.10 | <3.10.6 | 3.10.6 |
| ubuntu/python3.11 | <3.11.0 | 3.11.0 |
| ubuntu/python3.5 | <3.5.2-2ubuntu0~16.04.13+ | 3.5.2-2ubuntu0~16.04.13+ |
| ubuntu/python3.9 | <3.9.5-3ubuntu0~20.04.1+ | 3.9.5-3ubuntu0~20.04.1+ |
| debian/python2.7 | <=2.7.16-2+deb10u1<=2.7.16-2+deb10u4<=2.7.18-8+deb11u1 | |
| debian/python3.11 | 3.11.2-6 3.11.9-1 | |
| debian/python3.7 | <=3.7.3-2+deb10u3<=3.7.3-2+deb10u7 | |
| debian/python3.9 | <=3.9.2-1 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-28861 https://nvd.nist.gov/vuln/detail/CVE-2021-28861
- https://bugzilla.redhat.com/show_bug.cgi?id=2120642
- https://access.redhat.com/errata/RHSA-2023:0833
- https://access.redhat.com/errata/RHSA-2023:2763
- https://access.redhat.com/errata/RHSA-2023:2764
- https://access.redhat.com/errata/RHSA-2022:8353
- https://access.redhat.com/errata/RHSA-2022:6766
- https://access.redhat.com/security/cve/cve-2021-28861
- https://bugs.python.org/issue43223
- https://github.com/python/cpython/pull/24848
- https://github.com/python/cpython/pull/93879
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2TRINJE3INWDVIHIABW4L2NP3RUSK7BJ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5LTSPFIULY2GZJN3QYNFVM4JSU6H4D6J/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5OABQ5CMPQETJLFHROAXDIDXCMDTNVYG/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DISZAFSIQ7IAPAEQTC7G2Z5QUA2V2PSW/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HPX4XHT2FGVQYLY2STT2MRVENILNZTTU/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I3MQT5ZE3QH5PVDJMERTBOCILHK35CBE/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IFGV7P2PYFBMK32OKHCAC2ZPJQV5AUDF/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KRGKPYA5YHIXQAMRIXO5DSCX7D4UUW4Q/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OKYE2DOI2X7WZXAWTQJZAXYIWM37HDCY/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QLE5INSVJUZJGY5OJXV6JREXWD7UDHYN/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/S7G66SRWUM36ENQ3X6LAIG7HAB27D4XJ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TZEPOPUFC42KXXSLFPZ47ZZRGPOR7SQE/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WXF6MQ74HVIDDSR5AE2UDR24I6D4FEPC/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X46T4EFTIBXZRYTGASBDEZGYJINH2OWV/
- https://security.gentoo.org/glsa/202305-02
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2120645
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2120644
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2120787
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2120788
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2120789
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2120785
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2120784
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2120783
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2120786
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2121034
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2121035
- https://launchpad.net/bugs/cve/CVE-2021-28861
- https://exchange.xforce.ibmcloud.com/vulnerabilities/234228
- https://www.ibm.com/support/pages/node/6989653?_ga=2.22490043.1644592052.1684753176-785517468.1677620719 (Advisory)
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2TRINJE3INWDVIHIABW4L2NP3RUSK7BJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LTSPFIULY2GZJN3QYNFVM4JSU6H4D6J/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5OABQ5CMPQETJLFHROAXDIDXCMDTNVYG/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DISZAFSIQ7IAPAEQTC7G2Z5QUA2V2PSW/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HPX4XHT2FGVQYLY2STT2MRVENILNZTTU/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I3MQT5ZE3QH5PVDJMERTBOCILHK35CBE/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IFGV7P2PYFBMK32OKHCAC2ZPJQV5AUDF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KRGKPYA5YHIXQAMRIXO5DSCX7D4UUW4Q/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OKYE2DOI2X7WZXAWTQJZAXYIWM37HDCY/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QLE5INSVJUZJGY5OJXV6JREXWD7UDHYN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S7G66SRWUM36ENQ3X6LAIG7HAB27D4XJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TZEPOPUFC42KXXSLFPZ47ZZRGPOR7SQE/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WXF6MQ74HVIDDSR5AE2UDR24I6D4FEPC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X46T4EFTIBXZRYTGASBDEZGYJINH2OWV/
- https://github.com/python/cpython/commit/e2e8847bf52f4a81490653c6d13b7e3821b2c2be
- https://github.com/python/cpython/commit/5715382d3a89ca118ce2e224d8c69550d21fe51b
- https://github.com/python/cpython/commit/defaa2b19a9a01c79c1d5641a8aa179bb10ead3f
- https://github.com/python/cpython/commit/4dc2cae3abd75f386374d0635d00443b897d0672
- https://github.com/python/cpython/commit/8a34afd55258c721e446d6de4a70353c39a24148
- https://security-tracker.debian.org/tracker/CVE-2021-28861
- https://ubuntu.com/security/notices/USN-5629-1
- https://ubuntu.com/security/notices/USN-5888-1
- https://python-security.readthedocs.io/vuln/http-server-redirection.html
- https://www.cve.org/CVERecord?id=CVE-2021-28861
- https://nvd.nist.gov/vuln/detail/CVE-2021-28861
- https://ubuntu.com/security/CVE-2021-28861
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2021-28861?
CVE-2021-28861 is a vulnerability in Python 3.x through 3.10 that causes an open redirection vulnerability in lib/http/server.py.
How does CVE-2021-28861 affect the software?
CVE-2021-28861 affects Python 3.x through 3.10.
What is the severity of CVE-2021-28861?
CVE-2021-28861 has a severity rating of high.
What is the impact of CVE-2021-28861?
CVE-2021-28861 may lead to information disclosure.
How can CVE-2021-28861 be fixed?
To fix CVE-2021-28861, update to the recommended versions of Python that have the patch applied.
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