pysec - pysec-2020-340

pysec-2020-340

Vulnerability from pysec

Published

2020-03-30 19:45

Modified

2022-01-05 02:16

Details

In Mozilla Bleach before 3.1.4, bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS).

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "bleach",
        "purl": "pkg:pypi/bleach"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1",
        "0.1.1",
        "0.1.2",
        "0.2",
        "0.2.1",
        "0.2.2",
        "0.3",
        "0.3.1",
        "0.3.3",
        "0.3.4",
        "0.5.0",
        "0.5.1",
        "1.0.0",
        "1.0.1",
        "1.0.2",
        "1.0.3",
        "1.0.4",
        "1.1.0",
        "1.1.1",
        "1.1.2",
        "1.1.3",
        "1.1.4",
        "1.1.5",
        "1.2",
        "1.2.1",
        "1.2.2",
        "1.4",
        "1.4.1",
        "1.4.2",
        "1.4.3",
        "1.5.0",
        "2.0.0",
        "2.1",
        "2.1.1",
        "2.1.2",
        "2.1.3",
        "2.1.4",
        "3.0.0",
        "3.0.1",
        "3.0.2",
        "3.1.0",
        "3.1.1",
        "3.1.2",
        "3.1.3"
      ]
    }
  ],
  "aliases": [
    "CVE-2020-6817",
    "GHSA-vqhp-cxgc-6wmm",
    "SNYK-PYTHON-BLEACH-561754"
  ],
  "details": "In Mozilla Bleach before 3.1.4, `bleach.clean` behavior parsing style attributes could result in a regular expression denial of service (ReDoS).",
  "id": "PYSEC-2020-340",
  "modified": "2022-01-05T02:16:12.945364Z",
  "published": "2020-03-30T19:45:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm"
    },
    {
      "type": "ARTICLE",
      "url": "https://blog.r2c.dev/posts/finding-python-redos-bugs-at-scale-using-dlint-and-r2c/"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mozilla/bleach/releases/tag/v3.1.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://snyk.io/vuln/SNYK-PYTHON-BLEACH-561754"
    }
  ]
}

cve-2020-6817

Vulnerability from cvelistv5

Published

2023-02-16 00:00

Modified

2024-08-04 09:11

Severity ?

Summary

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']}).

References

▼	URL	Tags
	https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm
	https://bugzilla.mozilla.org/show_bug.cgi?id=1623633

Impacted products

▼	Vendor	Product
	Mozilla	Mozilla Bleach

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T09:11:05.144Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Mozilla Bleach",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "3.1.4",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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]})."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "regular expression denial-of-service (ReDoS) in BleachSanitizerFilter.sanitize_css gauntlet regular expression ",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-02-16T00:00:00",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm"
        },
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2020-6817",
    "datePublished": "2023-02-16T00:00:00",
    "dateReserved": "2020-01-10T00:00:00",
    "dateUpdated": "2024-08-04T09:11:05.144Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

ghsa-vqhp-cxgc-6wmm

Vulnerability from github

Published

2020-03-30 19:45

Modified

2024-09-06 15:46

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Summary

regular expression denial-of-service (ReDoS) in Bleach

Details

Impact

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']}).

Patches

3.1.4

Workarounds

do not whitelist the style attribute in bleach.clean calls
limit input string length

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1623633
https://www.regular-expressions.info/redos.html
https://blog.r2c.dev/posts/finding-python-redos-bugs-at-scale-using-dlint-and-r2c/
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6817

Credits

Reported by schwag09 of r2c

For more information

If you have any questions or comments about this advisory:

Open an issue at https://github.com/mozilla/bleach/issues
Email us at security@mozilla.org

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "bleach"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-6817"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333",
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-03-27T19:58:38Z",
    "nvd_published_at": "2023-02-16T22:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\n`bleach.clean` behavior parsing style attributes could result in a regular expression denial of service (ReDoS).\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]})``.\n\n### Patches\n\n3.1.4\n\n### Workarounds\n\n* do not whitelist 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",
  "id": "GHSA-vqhp-cxgc-6wmm",
  "modified": "2024-09-06T15:46:14Z",
  "published": "2020-03-30T19:45:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-6817"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623633"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mozilla/bleach"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mozilla/bleach/releases/tag/v3.1.4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/bleach/PYSEC-2020-340.yaml"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-PYTHON-BLEACH-561754"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "regular expression denial-of-service (ReDoS) in Bleach"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

pysec-2020-340

Vulnerability from pysec

cve-2020-6817

Vulnerability from cvelistv5

ghsa-vqhp-cxgc-6wmm

Vulnerability from github

Impact

Patches

Workarounds

References

Credits

For more information

Tags

Sightings

Nomenclature