Vulnerability-Lookup

CVE-2024-45047 (GCVE-0-2024-45047)

Vulnerability from cvelistv5 – Published: 2024-08-30 16:55 – Updated: 2024-08-30 18:11

Title

Potential mXSS vulnerability due to improper HTML escaping in svelte

Summary

svelte performance oriented web framework. A potential mXSS vulnerability exists in Svelte for versions up to but not including 4.2.19. Svelte improperly escapes HTML on server-side rendering. The assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks, and a type of the XSS is known as mXSS (mutation XSS). More specifically, this can occur when injecting malicious content into an attribute within a `noscript` tag. This issue has been addressed in release version 4.2.19. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Severity ?

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

URL

Tags

https://github.com/sveltejs/svelte/security/advis…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	sveltejs	svelte	Affected: < 4.2.19

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2024-45047

Vulnerability from fkie_nvd - Published: 2024-08-30 17:15 - Updated: 2024-09-25 19:06

Severity ?

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/sveltejs/svelte/security/advisories/GHSA-8266-84wp-wv5c	Exploit, Third Party Advisory

Impacted products

	Vendor	Product	Version
	svelte	svelte	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:svelte:svelte:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "99EE1DD2-1E41-4D09-A826-589B242D34BE",
              "versionEndExcluding": "4.2.19",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "svelte performance oriented web framework. A potential mXSS vulnerability exists in Svelte for versions up to but not including 4.2.19. Svelte improperly escapes HTML on server-side rendering. The assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks, and a type of the XSS is known as mXSS (mutation XSS). More specifically, this can occur when injecting malicious content into an attribute within a `noscript` tag. This issue has been addressed in release version 4.2.19. Users are advised to upgrade. There are no known workarounds for this vulnerability."
    },
    {
      "lang": "es",
      "value": "Svelte es un framework web orientado al rendimiento. Existe una vulnerabilidad potencial mXSS en Svelte para las versiones hasta la 4.2.19, pero no incluida. Svelte escapa incorrectamente el HTML en la representaci\u00f3n del lado del servidor. Se supone que los atributos siempre permanecer\u00e1n como tales, pero en algunas situaciones el \u00e1rbol DOM final representado en los navegadores es diferente de lo que Svelte espera en la representaci\u00f3n del lado del servidor. Esto se puede aprovechar para realizar ataques XSS, y un tipo de XSS se conoce como mXSS (XSS de mutaci\u00f3n). M\u00e1s espec\u00edficamente, esto puede ocurrir cuando se inyecta contenido malicioso en un atributo dentro de una etiqueta `noscript`. Este problema se ha solucionado en la versi\u00f3n de lanzamiento 4.2.19. Se recomienda a los usuarios que actualicen. No existen workarounds para esta vulnerabilidad."
    }
  ],
  "id": "CVE-2024-45047",
  "lastModified": "2024-09-25T19:06:47.717",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-08-30T17:15:15.377",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/sveltejs/svelte/security/advisories/GHSA-8266-84wp-wv5c"
    }
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  "vulnStatus": "Analyzed",
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    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-8266-84WP-WV5C

Vulnerability from github – Published: 2024-08-30 16:49 – Updated: 2024-08-30 20:01

Summary

Svelte has a potential mXSS vulnerability due to improper HTML escaping

Details

Summary

A potential XSS vulnerability exists in Svelte for versions prior to 4.2.19.

Details

Svelte improperly escapes HTML on server-side rendering. It converts strings according to the following rules:

If the string is an attribute value:
- " -> "
- & -> &
- Other characters -> No conversion
Otherwise:
- < -> <
- & -> &
- Other characters -> No conversion

The assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks. More specifically, this can occur when injecting malicious content into an attribute within a <noscript> tag.

PoC

A vulnerable page (+page.svelte):

<script>
import { page } from "$app/stores"

// user input
let href = $page.url.searchParams.get("href") ?? "https://example.com";
</script>

<noscript>
  <a href={href}>test</a>
</noscript>

If a user accesses the following URL,

http://localhost:4173/?href=</noscript><script>alert(123)</script>

then, alert(123) will be executed.

Impact

XSS, when using an attribute within a noscript tag

Severity ?

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

5.1 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "svelte"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.19"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-45047"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-08-30T16:49:10Z",
    "nvd_published_at": "2024-08-30T17:15:15Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nA potential XSS vulnerability exists in Svelte for versions prior to 4.2.19.\n\n### Details\n\nSvelte improperly escapes HTML on server-side rendering. It converts strings according to the following rules:\n\n- If the string is an attribute value:\n    - `\"` -\u003e `\u0026quot;`\n    - `\u0026` -\u003e `\u0026amp;`\n    - Other characters -\u003e No conversion\n- Otherwise:\n    - `\u003c` -\u003e `\u0026lt;`\n    - `\u0026` -\u003e `\u0026amp;`\n    - Other characters -\u003e No conversion\n\nThe assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks. More specifically, this can occur when injecting malicious content into an attribute within a `\u003cnoscript\u003e` tag.\n\n### PoC\n\nA vulnerable page (`+page.svelte`):\n```html\n\u003cscript\u003e\nimport { page } from \"$app/stores\"\n\n// user input\nlet href = $page.url.searchParams.get(\"href\") ?? \"https://example.com\";\n\u003c/script\u003e\n\n\u003cnoscript\u003e\n  \u003ca href={href}\u003etest\u003c/a\u003e\n\u003c/noscript\u003e\n```\n\nIf a user accesses the following URL,\n```\nhttp://localhost:4173/?href=\u003c/noscript\u003e\u003cscript\u003ealert(123)\u003c/script\u003e\n```\nthen, `alert(123)` will be executed.\n\n### Impact\n\nXSS, when using an attribute within a noscript tag",
  "id": "GHSA-8266-84wp-wv5c",
  "modified": "2024-08-30T20:01:23Z",
  "published": "2024-08-30T16:49:10Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/svelte/security/advisories/GHSA-8266-84wp-wv5c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-45047"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sveltejs/svelte/commit/83e96e044deb5ecbae2af361ae9e31d3e1ac43a3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sveltejs/svelte"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Svelte has a potential mXSS vulnerability due to improper HTML escaping"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2024-45047 (GCVE-0-2024-45047)

FKIE_CVE-2024-45047

GHSA-8266-84WP-WV5C

Summary

Details

PoC

Impact

Tags

Sightings

Nomenclature