pysec-2021-19
Vulnerability from pysec
Published
2021-03-21 05:15
Modified
2021-03-30 18:47
Details

An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.

Aliases


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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "lxml",
        "purl": "pkg:pypi/lxml"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a5f9cb52079dc57477c460dbe6ba0f775e14a999"
            }
          ],
          "repo": "https://github.com/lxml/lxml",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.6.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9",
        "0.9.1",
        "0.9.2",
        "1.0.beta",
        "1.0",
        "1.0.1",
        "1.0.2",
        "1.0.3",
        "1.0.4",
        "1.1alpha",
        "1.1beta",
        "1.1",
        "1.1.1",
        "1.1.2",
        "1.2",
        "1.2.1",
        "1.3beta",
        "1.3",
        "1.3.1",
        "1.3.2",
        "1.3.3",
        "1.3.4",
        "1.3.5",
        "1.3.6",
        "2.0alpha1",
        "2.0alpha2",
        "2.0alpha3",
        "2.0alpha4",
        "2.0alpha5",
        "2.0alpha6",
        "2.0beta1",
        "2.0beta2",
        "2.0",
        "2.0.1",
        "2.0.2",
        "2.0.3",
        "2.0.4",
        "2.0.5",
        "2.0.6",
        "2.0.7",
        "2.0.8",
        "2.0.9",
        "2.0.10",
        "2.0.11",
        "2.1alpha1",
        "2.1beta1",
        "2.1beta2",
        "2.1beta3",
        "2.1",
        "2.1.1",
        "2.1.2",
        "2.1.3",
        "2.1.4",
        "2.1.5",
        "2.2alpha1",
        "2.2beta1",
        "2.2beta2",
        "2.2beta3",
        "2.2beta4",
        "2.2",
        "2.2.1",
        "2.2.2",
        "2.2.3",
        "2.2.4",
        "2.2.5",
        "2.2.6",
        "2.2.7",
        "2.2.8",
        "2.3alpha1",
        "2.3alpha2",
        "2.3beta1",
        "2.3",
        "2.3.1",
        "2.3.2",
        "2.3.3",
        "2.3.4",
        "2.3.5",
        "2.3.6",
        "3.0",
        "3.0.1",
        "3.0.2",
        "3.1beta1",
        "3.1.0",
        "3.1.1",
        "3.1.2",
        "3.2.0",
        "3.2.1",
        "3.2.2",
        "3.2.3",
        "3.2.4",
        "3.2.5",
        "3.3.0beta1",
        "3.3.0beta2",
        "3.3.0beta3",
        "3.3.0beta4",
        "3.3.0beta5",
        "3.3.0",
        "3.3.1",
        "3.3.2",
        "3.3.3",
        "3.3.4",
        "3.3.5",
        "3.3.6",
        "3.4.0",
        "3.4.1",
        "3.4.2",
        "3.4.3",
        "3.4.4",
        "3.5.0b1",
        "3.5.0",
        "3.6.0",
        "3.6.1",
        "3.6.2",
        "3.6.3",
        "3.6.4",
        "3.7.0",
        "3.7.1",
        "3.7.2",
        "3.7.3",
        "3.8.0",
        "4.0.0",
        "4.1.0",
        "4.1.1",
        "4.2.0",
        "4.2.1",
        "4.2.2",
        "4.2.3",
        "4.2.4",
        "4.2.5",
        "4.2.6",
        "4.3.0",
        "4.3.1",
        "4.3.2",
        "4.3.3",
        "4.3.4",
        "4.3.5",
        "4.4.0",
        "4.4.1",
        "4.4.2",
        "4.4.3",
        "4.5.0",
        "4.5.1",
        "4.5.2",
        "4.6.0",
        "4.6.1",
        "4.6.2"
      ]
    }
  ],
  "aliases": [
    "CVE-2021-28957",
    "GHSA-jq4v-f5q6-mjqq"
  ],
  "details": "An XSS vulnerability was discovered in python-lxml\u0027s clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.",
  "id": "PYSEC-2021-19",
  "modified": "2021-03-30T18:47:00Z",
  "published": "2021-03-21T05:15:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://bugs.launchpad.net/lxml/+bug/1888153"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lxml/lxml/pull/316/commits/10ec1b4e9f93713513a3264ed6158af22492f270"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00031.html"
    },
    {
      "type": "FIX",
      "url": "https://github.com/lxml/lxml/commit/a5f9cb52079dc57477c460dbe6ba0f775e14a999"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.debian.org/security/2021/dsa-4880"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-jq4v-f5q6-mjqq"
    }
  ]
}


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