Vulnerability-Lookup

GHSA-2HFJ-CXW7-G45P

Vulnerability from github – Published: 2021-12-14 21:48 – Updated: 2022-01-04 18:54

Summary

Unsafe inline XSS in pasting DOM element into chat

Details

Impact

Inline scripts are executed when Javascript is parsed via a paste action.

Open https://watch.owncast.online/
Copy and then paste <img src=null onerror=alert('hello')> into the chat field.
An alert should pop up.

Patches

    ⋮ 13 │    // Content security policy
    ⋮ 14 │    csp := []string{
    ⋮ 15 │        "script-src 'self' 'sha256-2HPCfJIJHnY0NrRDPTOdC7AOSJIcQyNxzUuut3TsYRY='",
    ⋮ 16 │        "worker-src 'self' blob:", // No single quotes around blob:
    ⋮ 17 │    }

Will be patched in 0.0.9 by blocking unsafe-inline Content Security Policy and specifying the script-src. The worker-src is required to be set to blob for the video player.

For more information

If you have any questions or comments about this advisory: * Open an issue in owncast/owncast * Email us at gabek@real-ity.com

Severity

8.2 (High)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/owncast/owncast"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-39183"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-12-14T20:16:10Z",
    "nvd_published_at": "2021-12-14T20:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nInline scripts are executed when Javascript is parsed via a paste action.\n\n1. Open https://watch.owncast.online/\n2. Copy and then paste `\u003cimg src=null onerror=alert(\u0027hello\u0027)\u003e` into the\nchat field.\n3. An alert should pop up.\n\n### Patches\n```\n    \u22ee 13 \u2502    // Content security policy\n    \u22ee 14 \u2502    csp := []string{\n    \u22ee 15 \u2502        \"script-src \u0027self\u0027 \u0027sha256-2HPCfJIJHnY0NrRDPTOdC7AOSJIcQyNxzUuut3TsYRY=\u0027\",\n    \u22ee 16 \u2502        \"worker-src \u0027self\u0027 blob:\", // No single quotes around blob:\n    \u22ee 17 \u2502    }\n```\n\nWill be patched in 0.0.9 by blocking `unsafe-inline` Content Security Policy and specifying the `script-src`.  The `worker-src` is required to be set to `blob` for the video player.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [owncast/owncast](https://github.com/owncast/owncast/issues)\n* Email us at [gabek@real-ity.com](mailto:gabek@real-ity.com)\n",
  "id": "GHSA-2hfj-cxw7-g45p",
  "modified": "2022-01-04T18:54:05Z",
  "published": "2021-12-14T21:48:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/owncast/owncast/security/advisories/GHSA-2hfj-cxw7-g45p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-39183"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/owncast/owncast"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Unsafe inline XSS in pasting DOM element into chat"
}

CVE-2021-39183 (GCVE-0-2021-39183)

Vulnerability from cvelistv5 – Published: 2021-12-14 20:05 – Updated: 2024-08-04 01:58

Title

Unsafe inline XSS Owncast

Summary

Owncast is an open source, self-hosted live video streaming and chat server. In affected versions inline scripts are executed when Javascript is parsed via a paste action. This issue is patched in 0.0.9 by blocking unsafe-inline Content Security Policy and specifying the script-src. The worker-src is required to be set to blob for the video player.

Severity

8.2 (High)


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

CWE

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

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/owncast/owncast/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
owncast	owncast	Affected: < 0.0.9

Show details on NVD website

JSON

To clipboard

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            "url": "https://github.com/owncast/owncast/security/advisories/GHSA-2hfj-cxw7-g45p"
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        }
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      "references": [
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Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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