PyPI: urllib3
CVE-2016-9015
Safety vulnerability ID: SFTY-20170111-53746
Safety legacy ID: pyup.io-35691
Urllib3 version 1.18.1 includes a fix for CVE-2016-9015: Versions 1.17 and 1.18 of the Python urllib3 library suffer from a vulnerability that can cause them, in certain configurations, to not correctly validate TLS certificates. This places users of the library with those configurations at risk of man-in-the-middle and information leakage attacks. This vulnerability affects users using versions 1.17 and 1.18 of the urllib3 library, who are using the optional PyOpenSSL support for TLS instead of the regular standard library TLS backend, and who are using OpenSSL 1.1.0 via PyOpenSSL. This is an extremely uncommon configuration, so the security impact of this vulnerability is low. https://www.openwall.com/lists/oss-security/2016/10/27/6
Overview
Urllib3 Incorrect Certificate Validation
Advisory
Urllib3 version 1.18.1 includes a fix for CVE-2016-9015: Versions 1.17 and 1.18 of the Python urllib3 library suffer from a vulnerability that can cause them, in certain configurations, to not correctly validate TLS certificates. This places users of the library with those configurations at risk of man-in-the-middle and information leakage attacks. This vulnerability affects users using versions 1.17 and 1.18 of the urllib3 library, who are using the optional PyOpenSSL support for TLS instead of the regular standard library TLS backend, and who are using OpenSSL 1.1.0 via PyOpenSSL. This is an extremely uncommon configuration, so the security impact of this vulnerability is low. https://www.openwall.com/lists/oss-security/2016/10/27/6
How to Fix
Mitigation and Workarounds
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Vulnerable Functions
Functions linked to known vulnerabilities.
References
- https://getsafety.com/vulnerabilities/SFTY-20170111-53746/CVE-2016-9015
- https://nvd.nist.gov/vuln/detail/CVE-2016-9015
- http://www.openwall.com/lists/oss-security/2016/10/27/6
- https://web.archive.org/web/20210123184150/http://www.securityfocus.com/bid/93941
- https://github.com/urllib3/urllib3/commit/c32cdbc16a9634fa0f8c829d1270301570158715
- https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2017-98.yaml
- https://github.com/advisories/GHSA-v4w5-p2hg-8fh6
Verified by Safety
Our Cybersecurity Intelligence Team reviewed this vulnerability. We combine public data with our own research to find issues not yet reported to public sources.
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