CVE-2021-28363
First published: Mon Mar 15 2021(Updated: )
### Impact Users who are using an HTTPS proxy to issue HTTPS requests and haven't configured their own SSLContext via `proxy_config`. Only the default SSLContext is impacted. ### Patches [urllib3 >=1.26.4 has the issue resolved](https://github.com/urllib3/urllib3/releases/tag/1.26.4). urllib3<1.26 is not impacted due to not supporting HTTPS requests via HTTPS proxies. ### Workarounds Upgrading is recommended as this is a minor release and not likely to break current usage. Configuring an `SSLContext` with `check_hostname=True` and passing via `proxy_config` instead of relying on the default `SSLContext` ### For more information If you have any questions or comments about this advisory: * Email us at [sethmichaellarson@gmail.com](mailto:sethmichaellarson@gmail.com)
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Python urllib3 | >=1.26.0<1.26.4 | |
| Fedoraproject Fedora | =34 | |
| Oracle PeopleSoft Enterprise PeopleTools | =8.59 | |
| IBM Cognos Analytics | <=12.0-12.0.2 | |
| IBM Cognos Analytics | <=11.2.0-11.2.4 FP2 | |
| pip/urllib3 | >=1.26.0<1.26.4 | 1.26.4 |
| >=1.26.0<1.26.4 | ||
| =34 | ||
| =8.59 |
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Reference Links
- https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0
- https://github.com/urllib3/urllib3/commits/main
- https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL/
- https://pypi.org/project/urllib3/1.26.4/
- https://security.gentoo.org/glsa/202107-36
- https://security.gentoo.org/glsa/202305-02
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/198199
- https://www.ibm.com/support/pages/node/7149874 (Advisory)
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL/
- https://security.netapp.com/advisory/ntap-20240621-0007/
- https://nvd.nist.gov/vuln/detail/CVE-2021-28363
- https://github.com/urllib3/urllib3/releases/tag/1.26.4
- https://github.com/urllib3/urllib3/blob/main/CHANGES.rst#1264-2021-03-15
- https://github.com/pypa/advisory-db/tree/main/vulns/urllib3/PYSEC-2021-59.yaml
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL
- https://pypi.org/project/urllib3/1.26.4
- https://security.netapp.com/advisory/ntap-20240621-0007
- https://github.com/advisories/GHSA-5phf-pp7p-vc2r (Advisory)
- https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2021-59.yaml
Frequently Asked Questions
What is CVE-2021-28363?
CVE-2021-28363 is a vulnerability in the urllib3 library for Python that allows SSL certificate validation to be omitted in some cases involving HTTPS to HTTPS proxies.
What is the severity of CVE-2021-28363?
The severity of CVE-2021-28363 is medium with a CVSS score of 6.5.
Which software versions are affected by CVE-2021-28363?
The Python urllib3 library versions 1.26.0 to 1.26.3 are affected by CVE-2021-28363.
How does CVE-2021-28363 impact Oracle PeopleSoft Enterprise PeopleTools?
Oracle PeopleSoft Enterprise PeopleTools version 8.59 is affected by CVE-2021-28363.
How do I fix CVE-2021-28363?
To fix CVE-2021-28363, upgrade to urllib3 version 1.26.4 for Python or a later stable release.
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