GHSA-67C6-Q4J4-HCCG

Vulnerability from github – Published: 2023-08-16 21:02 – Updated: 2023-08-16 21:02
VLAI
Summary
Flarum vulnerable to LFI and Blind SSRF via Avatar upload
Details

Impact

The Flarum forum software is affected by a vulnerability that allows an attacker to conduct a Blind SSRF attack or disclose any file on the server, even with a basic user account on any Flarum forum. By uploading a file containing a URL and spoofing the MIME type, an attacker can manipulate the application to execute unintended actions. The vulnerability is due to the behavior of the intervention/image package, which attempts to interpret the supplied file contents as a URL, which then fetches its contents. This allows an attacker to exploit the vulnerability to perform SSRF attacks, disclose local file contents, or conduct a blind oracle attack.

Patches

This has been patched in Flarum v1.8.

Workarounds

As a temporary workaround for the SSRF aspect of the vulnerability, one can disable PHP's allow_url_fopen which will prevent the fetching of external files via URLs.

Credits

Adam Kues - Assetnote

Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "flarum/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "flarum/framework"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-40033"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918",
      "CWE-98"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-08-16T21:02:52Z",
    "nvd_published_at": "2023-08-16T21:15:09Z",
    "severity": "HIGH"
  },
  "details": "## Impact\nThe Flarum forum software is affected by a vulnerability that allows an attacker to conduct a Blind SSRF attack or disclose any file on the server, even with a basic user account on any Flarum forum. By uploading a file containing a URL and spoofing the MIME type, an attacker can manipulate the application to execute unintended actions. The vulnerability is due to the behavior of the `intervention/image` package, which attempts to interpret the supplied file contents as a URL, which then fetches its contents. This allows an attacker to exploit the vulnerability to perform SSRF attacks, disclose local file contents, or conduct a blind oracle attack.\n\n### Patches\nThis has been patched in Flarum **v1.8**.\n\n## Workarounds\nAs a temporary workaround for the SSRF aspect of the vulnerability, one can disable PHP\u0027s `allow_url_fopen` which will prevent the fetching of external files via URLs.\n\n### Credits\nAdam Kues - [Assetnote](https://assetnote.io/)\n",
  "id": "GHSA-67c6-q4j4-hccg",
  "modified": "2023-08-16T21:02:52Z",
  "published": "2023-08-16T21:02:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-40033"
    },
    {
      "type": "WEB",
      "url": "https://github.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/flarum/framework"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Flarum vulnerable to LFI and Blind SSRF via Avatar upload"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.