github - ghsa-qm58-cvvm-c5qr

GHSA-QM58-CVVM-C5QR

Vulnerability from github – Published: 2021-06-15 15:51 – Updated: 2022-08-11 00:02

Summary

elFinder unsafe upload filtering leading to remote code execution

Details

Impact

Before elFinder 2.1.58, the upload filter did not disallow the upload of .phar files. As several Linux distributions are now shipping Apache configured in a way it will process these files as PHP scripts, attackers could gain arbitrary code execution on the server hosting the PHP connector (even in minimal configuration).

Patches

The issue has been addressed with https://github.com/Studio-42/elFinder/commit/75ea92decc16a5daf7f618f85dc621d1b534b5e1, associating .phar files to the right MIME type. Unless explicitly allowed in the configuration, such files cannot be uploaded anymore. This patch is part of the last release of elFinder, 2.1.58.

Workarounds

If you can't update to 2.1.58, make sure your connector is not exposed without authentication.

Important tips

Server-side scripts can often be created as text files. Currently, elFinder has an appropriate MIME type set for file extensions that are generally runnable on a web server.

However, the server has various settings. In some cases, the executable file may be judged as "text/plain". Therefore, elFinder installers should understand the extensions that can be executed on the web server where elFinder is installed, and check if there are any missing items in the elFinder settings.

The elFinder PHP connector has an option "additionalMimeMap" that specifies the MIME type for each extension. See #3295(comment) for more information.

References

https://snyk.io/vuln/composer:studio-42%2Felfinder
https://github.com/Studio-42/elFinder/issues/3295
Further technical details will be disclosed on https://blog.sonarsource.com/tag/security after some time.

For more information

If you have any questions or comments about this advisory, you can contact: - The original reporters, by sending an email to support [at] snyk.io or vulnerability.research [at] sonarsource.com; - The maintainers, by opening an issue on this repository.

Severity ?

8.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "studio-42/elfinder"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.58"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-23394"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-434"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-06-14T22:14:26Z",
    "nvd_published_at": "2021-06-13T11:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nBefore elFinder 2.1.58, the upload filter did not disallow the upload of `.phar` files. As several Linux distributions are now shipping Apache configured in a way it will process these files as PHP scripts, attackers could gain arbitrary code execution on the server hosting the PHP connector (even in minimal configuration).\n\n### Patches\n\nThe issue has been addressed with https://github.com/Studio-42/elFinder/commit/75ea92decc16a5daf7f618f85dc621d1b534b5e1, associating `.phar` files to the right MIME type. Unless explicitly allowed in the configuration, such files cannot be uploaded anymore. This patch is part of the last release of elFinder, 2.1.58.\n\n### Workarounds\n\nIf you can\u0027t update to 2.1.58, make sure your connector is not exposed without authentication.\n\n### Important tips\n\nServer-side scripts can often be created as text files. Currently, elFinder has an appropriate MIME type set for file extensions that are generally runnable on a web server.\n\nHowever, the server has various settings. In some cases, the executable file may be judged as \"text/plain\". Therefore, elFinder installers should understand the extensions that can be executed on the web server where elFinder is installed, and check if there are any missing items in the elFinder settings.\n\nThe elFinder PHP connector has an option \"additionalMimeMap\" that specifies the MIME type for each extension. See [#3295(comment)](https://github.com/Studio-42/elFinder/issues/3295#issuecomment-853042139) for more information.\n\n### References\n\n- https://snyk.io/vuln/composer:studio-42%2Felfinder\n- https://github.com/Studio-42/elFinder/issues/3295\n- Further technical details will be disclosed on https://blog.sonarsource.com/tag/security after some time.\n\n### For more information\n\nIf you have any questions or comments about this advisory, you can contact:\n- The original reporters, by sending an email to  support [at] snyk.io or vulnerability.research [at] sonarsource.com;\n- The maintainers, by opening an issue on this repository.",
  "id": "GHSA-qm58-cvvm-c5qr",
  "modified": "2022-08-11T00:02:52Z",
  "published": "2021-06-15T15:51:02Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Studio-42/elFinder/security/advisories/GHSA-qm58-cvvm-c5qr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23394"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Studio-42/elFinder/issues/3295"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Studio-42/elFinder/commit/75ea92decc16a5daf7f618f85dc621d1b534b5e1"
    },
    {
      "type": "WEB",
      "url": "https://blog.sonarsource.com/elfinder-case-study-of-web-file-manager-vulnerabilities"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Studio-42/elFinder"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-PHP-STUDIO42ELFINDER-1290554"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "elFinder unsafe upload filtering leading to remote code execution"
}

CVE-2021-23394 (GCVE-0-2021-23394)

Vulnerability from cvelistv5 – Published: 2021-06-13 11:05 – Updated: 2024-09-16 22:30

Summary

The package studio-42/elfinder before 2.1.58 are vulnerable to Remote Code Execution (RCE) via execution of PHP code in a .phar file. NOTE: This only applies if the server parses .phar files as PHP.

Severity ?

8.1 (High)


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

CWE

Remote Code Execution (RCE)

Assigner

snyk

References

URL

Tags

	https://snyk.io/vuln/SNYK-PHP-STUDIO42ELFINDER-1290554	x_refsource_MISC
	https://github.com/Studio-42/elFinder	x_refsource_MISC
	https://github.com/Studio-42/elFinder/issues/3295	x_refsource_MISC
	https://github.com/Studio-42/elFinder/commit/75ea…	x_refsource_MISC
	https://blog.sonarsource.com/elfinder-case-study-…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	n/a	studio-42/elfinder	Affected: unspecified , < 2.1.58 (custom)

Credits

Ashok Chand

Show details on NVD website

JSON

To clipboard

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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

GHSA-QM58-CVVM-C5QR

Impact

Patches

Workarounds

Important tips

References

For more information

CVE-2021-23394 (GCVE-0-2021-23394)

Tags

Sightings

Nomenclature