pysec - pysec-2020-28

pysec-2020-28

Vulnerability from pysec

Published

2020-03-24 22:15

Modified

2021-03-30 23:15

Details

In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.

Impacted products

Name	purl
bleach	pkg:pypi/bleach

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "bleach",
        "purl": "pkg:pypi/bleach"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.2"
            }
          ],
          "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"
      ]
    }
  ],
  "aliases": [
    "CVE-2020-6816",
    "GHSA-m6xf-fq7q-8743"
  ],
  "details": "In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.",
  "id": "PYSEC-2020-28",
  "modified": "2021-03-30T23:15:00Z",
  "published": "2020-03-24T22:15:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743"
    },
    {
      "type": "ARTICLE",
      "url": "https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5/"
    },
    {
      "type": "ADVISORY",
      "url": "https://advisory.checkmarx.net/advisory/CX-2020-4277"
    }
  ]
}

ghsa-m6xf-fq7q-8743

Vulnerability from github

Published

2020-03-24 15:06

Modified

2024-09-12 20:49

Severity ?

6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Summary

Bleach vulnerable to mutation XSS via whitelisted math or svg and raw tag

Details

Impact

A mutation XSS affects users calling bleach.clean with all of:

the svg or math in the allowed/whitelisted tags
an RCDATA tag (see below) in the allowed/whitelisted tags
the keyword argument strip=False

Patches

Users are encouraged to upgrade to bleach v3.1.2 or greater.

Workarounds

modify bleach.clean calls to use strip=True, or not whitelist math or svg tags and one or more of the following tags:

script noscript style noframes xmp noembed iframe

A strong Content-Security-Policy without unsafe-inline and unsafe-eval script-srcs) will also help mitigate the risk.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1621692
https://cure53.de/fp170.pdf
https://nvd.nist.gov/vuln/detail/CVE-2020-6816
https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach

Credits

Reported by Yaniv Nizry from the CxSCA AppSec group at Checkmarx

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": "3.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-6816"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-03-23T22:25:38Z",
    "nvd_published_at": "2020-03-24T22:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nA [mutation XSS](https://cure53.de/fp170.pdf) affects users calling `bleach.clean` with all of:\n\n* the `svg` or `math` in the allowed/whitelisted tags\n* an RCDATA tag (see below) in the allowed/whitelisted tags\n* the keyword argument `strip=False`\n\n### Patches\n\nUsers are encouraged to upgrade to bleach v3.1.2 or greater.\n\n### Workarounds\n\n* modify `bleach.clean` calls to use `strip=True`, or not whitelist `math` or `svg` tags and one or more of the following tags:\n\n```\nscript\nnoscript\nstyle\nnoframes\nxmp\nnoembed\niframe\n```\n\n* A strong [Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP) without `unsafe-inline` and `unsafe-eval` [`script-src`s](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src)) will also help mitigate the risk.\n\n### References\n\n* https://bugzilla.mozilla.org/show_bug.cgi?id=1621692\n* https://cure53.de/fp170.pdf\n* https://nvd.nist.gov/vuln/detail/CVE-2020-6816\n* https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach\n\n### Credits\n\n* Reported by [Yaniv Nizry](https://twitter.com/ynizry) from the CxSCA AppSec group at Checkmarx\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Open an issue at [https://github.com/mozilla/bleach/issues](https://github.com/mozilla/bleach/issues)\n* Email us at [security@mozilla.org](mailto:security@mozilla.org)",
  "id": "GHSA-m6xf-fq7q-8743",
  "modified": "2024-09-12T20:49:31Z",
  "published": "2020-03-24T15:06:32Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-6816"
    },
    {
      "type": "WEB",
      "url": "https://advisory.checkmarx.net/advisory/CX-2020-4277"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mozilla/bleach"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mozilla/bleach/releases/tag/v3.1.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/bleach/PYSEC-2020-28.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5"
    },
    {
      "type": "WEB",
      "url": "https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Bleach vulnerable to mutation XSS via whitelisted math or svg and raw tag"
}

CVE-2020-6816 (GCVE-0-2020-6816)

Vulnerability from cvelistv5

Published

2020-03-24 21:15

Modified

2024-08-04 09:11

Severity ?

CWE

mutation XSS

Summary

In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.

References

URL

Tags

	https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743	x_refsource_MISC
	https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5/	vendor-advisory, x_refsource_FEDORA
	https://advisory.checkmarx.net/advisory/CX-2020-4277	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	n/a	Mozilla Bleach	Version: <=3.11

Show details on NVD website

JSON

To clipboard

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          },
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            ],
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}

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.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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-2020-28

Vulnerability from pysec

ghsa-m6xf-fq7q-8743

Vulnerability from github

Impact

Patches

Workarounds

References

Credits

For more information

CVE-2020-6816 (GCVE-0-2020-6816)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature