pysec-2018-52
Vulnerability from pysec
Published
2018-07-30 16:29
Modified
2021-07-15 02:22
Details

A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage.

Impacted products
Name purl
cryptography pkg:pypi/cryptography
Aliases


To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "cryptography",
        "purl": "pkg:pypi/cryptography"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.9"
            },
            {
              "fixed": "2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9",
        "2.0",
        "2.0.1",
        "2.0.2",
        "2.0.3",
        "2.1",
        "2.1.1",
        "2.1.2",
        "2.1.3",
        "2.1.4",
        "2.2",
        "2.2.1",
        "2.2.2"
      ]
    }
  ],
  "aliases": [
    "CVE-2018-10903",
    "GHSA-fcf9-3qw3-gxmj"
  ],
  "details": "A flaw was found in python-cryptography versions between \u003e=1.9.0 and \u003c2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage.",
  "id": "PYSEC-2018-52",
  "modified": "2021-07-15T02:22:07.445715Z",
  "published": "2018-07-30T16:29:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/3720-1/"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2018:3600"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-fcf9-3qw3-gxmj"
    }
  ]
}


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