csaf_certbund - WID-SEC-W-2024-3505

WID-SEC-W-2024-3505

Vulnerability from csaf_certbund

Published

2024-11-19 23:00

Modified

2024-11-19 23:00

Summary

lxml: Schwachstelle ermöglicht Cross-Site Scripting

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung

lxml ist ein XML-Toolkit für Python, das die C-Bibliotheken libxml2 und libxslt verwendet.

Angriff

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in lxml ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.

Betroffene Betriebssysteme

- Sonstiges - UNIX - Windows

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "lxml ist ein XML-Toolkit f\u00fcr Python, das die C-Bibliotheken libxml2 und libxslt verwendet.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in lxml ausnutzen, um einen Cross-Site Scripting Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Sonstiges\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2024-3505 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2024/wid-sec-w-2024-3505.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2024-3505 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2024-3505"
      },
      {
        "category": "external",
        "summary": "Github Advisory Database vom 2024-11-19",
        "url": "https://github.com/advisories/GHSA-5jfw-gq64-q45f"
      }
    ],
    "source_lang": "en-US",
    "title": "lxml: Schwachstelle erm\u00f6glicht Cross-Site Scripting",
    "tracking": {
      "current_release_date": "2024-11-19T23:00:00.000+00:00",
      "generator": {
        "date": "2024-11-20T10:12:43.869+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.8"
        }
      },
      "id": "WID-SEC-W-2024-3505",
      "initial_release_date": "2024-11-19T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2024-11-19T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c0.4.0",
                "product": {
                  "name": "Open Source lxml \u003c0.4.0",
                  "product_id": "T039310"
                }
              },
              {
                "category": "product_version",
                "name": "0.4.0",
                "product": {
                  "name": "Open Source lxml 0.4.0",
                  "product_id": "T039310-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:lxml:lxml:0.4.0"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "lxml"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2024-52595",
      "notes": [
        {
          "category": "description",
          "text": "In lxml existiert eine Cross-Site Scripting Schwachstelle. HTML und Script-Eingaben werden in HTML Parser nicht ordnungsgem\u00e4\u00df \u00fcberpr\u00fcft, bevor sie an den Benutzer zur\u00fcckgegeben werden. Ein entfernter, anonymer Angreifer kann durch Ausnutzung dieser Schwachstelle beliebigen HTML- und Script-Code durch den Browser des Benutzers im Kontext der betroffenen Seite ausf\u00fchren."
        }
      ],
      "product_status": {
        "known_affected": [
          "T039310"
        ]
      },
      "release_date": "2024-11-19T23:00:00.000+00:00",
      "title": "CVE-2024-52595"
    }
  ]
}

cve-2024-52595

Vulnerability from cvelistv5

Published

2024-11-19 21:27

Modified

2024-11-20 15:19

Severity ?

7.7 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H

Summary

lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.0, the HTML Parser in lxml does not properly handle context-switching for special HTML tags such as `<svg>`, `<math>` and `<noscript>`. This behavior deviates from how web browsers parse and interpret such tags. Specifically, content in CSS comments is ignored by lxml_html_clean but may be interpreted differently by web browsers, enabling malicious scripts to bypass the cleaning process. This vulnerability could lead to Cross-Site Scripting (XSS) attacks, compromising the security of users relying on lxml_html_clean in default configuration for sanitizing untrusted HTML content. Users employing the HTML cleaner in a security-sensitive context should upgrade to lxml 0.4.0, which addresses this issue. As a temporary mitigation, users can configure lxml_html_clean with the following settings to prevent the exploitation of this vulnerability. Via `remove_tags`, one may specify tags to remove - their content is moved to their parents' tags. Via `kill_tags`, one may specify tags to be removed completely. Via `allow_tags`, one may restrict the set of permissible tags, excluding context-switching tags like `<svg>`, `<math>` and `<noscript>`.

References

▼	URL	Tags
	https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-5jfw-gq64-q45f	x_refsource_CONFIRM
	https://github.com/fedora-python/lxml_html_clean/pull/19	x_refsource_MISC
	https://github.com/fedora-python/lxml_html_clean/commit/c5d816f86eb3707d72a8ecf5f3823e0daa1b3808	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	fedora-python	lxml_html_clean	Version: < 0.4.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-52595",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-11-20T15:18:41.666822Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-11-20T15:19:10.677Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "lxml_html_clean",
          "vendor": "fedora-python",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.4.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.0, the HTML Parser in lxml does not properly handle context-switching for special HTML tags such as `\u003csvg\u003e`, `\u003cmath\u003e` and `\u003cnoscript\u003e`. This behavior deviates from how web browsers parse and interpret such tags. Specifically, content in CSS comments is ignored by lxml_html_clean but may be interpreted differently by web browsers, enabling malicious scripts to bypass the cleaning process. This vulnerability could lead to Cross-Site Scripting (XSS) attacks, compromising the security of users relying on lxml_html_clean in default configuration for sanitizing untrusted HTML content. Users employing the HTML cleaner in a security-sensitive context should upgrade to lxml 0.4.0, which addresses this issue. As a temporary mitigation, users can configure lxml_html_clean with the following settings to prevent the exploitation of this vulnerability. Via `remove_tags`, one may specify tags to remove - their content is moved to their parents\u0027 tags. Via `kill_tags`, one may specify tags to be removed completely. Via `allow_tags`, one may restrict the set of permissible tags, excluding context-switching tags like `\u003csvg\u003e`, `\u003cmath\u003e` and `\u003cnoscript\u003e`."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-83",
              "description": "CWE-83: Improper Neutralization of Script in Attributes in a Web Page",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-184",
              "description": "CWE-184: Incomplete List of Disallowed Inputs",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-11-19T21:27:08.871Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-5jfw-gq64-q45f",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-5jfw-gq64-q45f"
        },
        {
          "name": "https://github.com/fedora-python/lxml_html_clean/pull/19",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/fedora-python/lxml_html_clean/pull/19"
        },
        {
          "name": "https://github.com/fedora-python/lxml_html_clean/commit/c5d816f86eb3707d72a8ecf5f3823e0daa1b3808",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/fedora-python/lxml_html_clean/commit/c5d816f86eb3707d72a8ecf5f3823e0daa1b3808"
        }
      ],
      "source": {
        "advisory": "GHSA-5jfw-gq64-q45f",
        "discovery": "UNKNOWN"
      },
      "title": "HTML Cleaner allows crafted scripts in special contexts like svg or math to pass through"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-52595",
    "datePublished": "2024-11-19T21:27:08.871Z",
    "dateReserved": "2024-11-14T15:05:46.768Z",
    "dateUpdated": "2024-11-20T15:19:10.677Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

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