gsd-2020-6817
Vulnerability from gsd
Modified
2023-12-13 01:21
Details
bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={'a': ['style']}).
Aliases
Aliases
CVE-2020-6817


To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-6817",
    "id": "GSD-2020-6817",
    "references": [
      "https://www.suse.com/security/cve/CVE-2020-6817.html",
      "https://advisories.mageia.org/CVE-2020-6817.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-6817"
      ],
      "details": "bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={\u0027a\u0027: [\u0027style\u0027]}).",
      "id": "GSD-2020-6817",
      "modified": "2023-12-13T01:21:54.784364Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@mozilla.org",
        "ID": "CVE-2020-6817",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Mozilla Bleach",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_value": "3.1.4"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Mozilla"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={\u0027a\u0027: [\u0027style\u0027]})."
          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "regular expression denial-of-service (ReDoS) in BleachSanitizerFilter.sanitize_css gauntlet regular expression "
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm",
            "refsource": "MISC",
            "url": "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm"
          },
          {
            "name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633",
            "refsource": "MISC",
            "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633"
          }
        ]
      },
      "source": {
        "discovery": "UNKNOWN"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c3.1.4",
          "affected_versions": "All versions before 3.1.4",
          "cwe_ids": [
            "CWE-1035",
            "CWE-937"
          ],
          "date": "2021-08-23",
          "description": "### Impact\n\n`bleach.clean` behavior parsing style attributes could result in a regular expression denial of service .\n\nCalls to ``bleach.clean`` with an allowed tag with an allowed ``style`` attribute are vulnerable to ReDoS. For example, ``bleach.clean(..., attributes={\u0027a\u0027: \u0027style\u0027 Workarounds\n\n* do not allowlist the style attribute in `bleach.clean` calls\n\n* limit input string length\n\n### References\n\n* https://bugzilla.mozilla.org/show_bug.cgi?id=1623633\n* https://www.regular-expressions.info/redos.html\n* https://blog.r2c.dev/posts/finding-python-redos-bugs-at-scale-using-dlint-and-r2c/\n* https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6817\n\n### Credits\n\n* Reported by schwag09 of r2c\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Open an issue at https://github.com/mozilla/bleach/issues\n* Email us at security@mozilla.org",
          "fixed_versions": [
            "3.1.4"
          ],
          "identifier": "GMS-2020-698",
          "identifiers": [
            "GHSA-vqhp-cxgc-6wmm",
            "GMS-2020-698",
            "CVE-2020-6817"
          ],
          "not_impacted": "All versions starting from 3.1.4",
          "package_slug": "pypi/bleach",
          "pubdate": "2020-03-30",
          "solution": "Upgrade to version 3.1.4 or above.",
          "title": "regular expression denial-of-service  in Bleach",
          "urls": [
            "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm",
            "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633",
            "https://github.com/mozilla/bleach/releases/tag/v3.1.4",
            "https://nvd.nist.gov/vuln/detail/CVE-2020-6817",
            "https://snyk.io/vuln/SNYK-PYTHON-BLEACH-561754",
            "https://github.com/advisories/GHSA-vqhp-cxgc-6wmm"
          ],
          "uuid": "55a10afd-a2bb-4082-b092-81d2505527e3"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "3.1.4",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security@mozilla.org",
          "ID": "CVE-2020-6817"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={\u0027a\u0027: [\u0027style\u0027]})."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-1333"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm",
              "refsource": "MISC",
              "tags": [
                "Vendor Advisory"
              ],
              "url": "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm"
            },
            {
              "name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633",
              "refsource": "MISC",
              "tags": [
                "Exploit",
                "Issue Tracking"
              ],
              "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2023-02-28T14:46Z",
      "publishedDate": "2023-02-16T22:15Z"
    }
  }
}


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