GoogleOSV:GHSA-5PHF-PP7P-VC2RUsing default SSLContext for HTTPS requests in an HTTPS proxy doesn't verify certificate hostname for proxy connection
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.4 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
0.001 Low
EPSS
Percentile
48.5%
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]
References
github.com/pypa/advisory-db/tree/main/vulns/urllib3/PYSEC-2021-59.yaml
github.com/urllib3/urllib3
github.com/urllib3/urllib3/blob/main/CHANGES.rst#1264-2021-03-15
github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0
github.com/urllib3/urllib3/commits/main
github.com/urllib3/urllib3/releases/tag/1.26.4
github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r
lists.fedoraproject.org/archives/list/[email protected]/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL
nvd.nist.gov/vuln/detail/CVE-2021-28363
pypi.org/project/urllib3/1.26.4
security.gentoo.org/glsa/202107-36
security.gentoo.org/glsa/202305-02
www.oracle.com/security-alerts/cpuoct2021.html
Related
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.4 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
0.001 Low
EPSS
Percentile
48.5%