PYSEC-2021-59

Vulnerability from pysec - Published: 2021-03-15 18:15 - Updated: 2021-03-23 16:47
VLAI
Details

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.

Impacted products
Name purl
urllib3 pkg:pypi/urllib3
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "urllib3",
        "purl": "pkg:pypi/urllib3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0"
            }
          ],
          "repo": "https://github.com/urllib3/urllib3",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "1.26.0"
            },
            {
              "fixed": "1.26.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.26.0",
        "1.26.1",
        "1.26.2",
        "1.26.3"
      ]
    }
  ],
  "aliases": [
    "CVE-2021-28363",
    "GHSA-5phf-pp7p-vc2r"
  ],
  "details": "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\u0027t given via proxy_config) doesn\u0027t 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.",
  "id": "PYSEC-2021-59",
  "modified": "2021-03-23T16:47:00Z",
  "published": "2021-03-15T18:15:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/urllib3/urllib3/commits/main"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/urllib3/1.26.4/"
    },
    {
      "type": "FIX",
      "url": "https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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