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Bug 835609 (CVE-2021-28363) - [Tracker] urllib3 improper HTTPS certificate validation
Summary: [Tracker] urllib3 improper HTTPS certificate validation
Alias: CVE-2021-28363
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
Depends on: 835625 776421 835443
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Reported: 2022-03-19 04:10 UTC by John Helmert III
Modified: 2022-03-25 12:32 UTC (History)
1 user (show)

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Runtime testing required: ---


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Description John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2022-03-19 04:10:04 UTC
"The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies. The initial connection to the HTTPS proxy (if an SSLContext isn't given via proxy_config) doesn't verify the hostname of the certificate. This means certificates for different servers that still validate properly with the default urllib3 SSLContext will be silently accepted."