GitHub Advisoryadvisory · PyPI
GHSA-5phf-pp7p-vc2r Using default SSLContext for HTTPS requests in an HTTPS proxy doesn't verify certificate hostname for proxy connection
MEDIUM
Official page ↗
- Aliases
- CVE-2021-28363
- Ecosystem
- PyPI
- Packages
- urllib3
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Weaknesses
- CWE-295
- Reviewed
- 2021-03-19
Affected packages
• PyPI urllib3: >= 1.26.0, < 1.26.4 → fixed in 1.26.4
Description
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. 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 [email protected]
Related
Alias · CVE (1)
- CVE-2021-28363 The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies. vulnerability
Weakness · CWE (1)
- CWE-295 Improper Certificate Validation weakness
References
- https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r web
- https://nvd.nist.gov/vuln/detail/CVE-2021-28363 advisory
- https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0 web
- https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2021-59.yaml web
- https://github.com/pypa/advisory-db/tree/main/vulns/urllib3/PYSEC-2021-59.yaml web
- https://github.com/urllib3/urllib3 package
- https://github.com/urllib3/urllib3/blob/main/CHANGES.rst#1264-2021-03-15 web
- https://github.com/urllib3/urllib3/commits/main web
- https://github.com/urllib3/urllib3/releases/tag/1.26.4 web
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL web
- https://lists.fedoraproject.org/archives/list/[email protected]/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL web
- https://pypi.org/project/urllib3/1.26.4 web
- https://security.gentoo.org/glsa/202107-36 web
- https://security.gentoo.org/glsa/202305-02 web
- https://security.netapp.com/advisory/ntap-20240621-0007 web
- https://www.oracle.com/security-alerts/cpuoct2021.html web