github - ghsa-vhm8-wwrf-3gcw

GHSA-VHM8-WWRF-3GCW

Vulnerability from github – Published: 2023-03-13 20:52 – Updated: 2023-03-13 20:52

Summary

Path Traversal Vulnerability in `LESS` Parser allows reading of sensitive server files

Details

Impact

If an admin account has already been compromised by an attacker, the LESS parser can be exploited to read sensitive files on the server through the use of path traversal techniques.

An attacker can achieve this by providing an absolute path to a sensitive file in the custom LESS setting, which the LESS parser will then read. For example, an attacker could use the following code to read the contents of the /etc/passwd file:

@import (inline) '/etc/passwd';

.test {
  content: data-uri('/etc/passwd');
}

Patches

The vulnerability has been addressed in version 1.7. Users should upgrade to this version to mitigate the vulnerability.

Workarounds

Users can mitigate the vulnerability by ensuring that their admin accounts are secured with strong passwords and other best practices for account security. Additionally, users can limit the exposure of sensitive files on the server by implementing appropriate file permissions and access controls.

Severity ?

6.5 (Medium)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "flarum/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.7.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-27577"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-03-13T20:52:11Z",
    "nvd_published_at": "2023-03-10T21:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nIf an admin account has already been compromised by an attacker, the `LESS` parser can be exploited to read sensitive files on the server through the use of path traversal techniques.\n\nAn attacker can achieve this by providing an absolute path to a sensitive file in the custom `LESS` setting, which the `LESS` parser will then read. For example, an attacker could use the following code to read the contents of the `/etc/passwd` file:\n\n```less\n@import (inline) \u0027/etc/passwd\u0027;\n\n.test {\n  content: data-uri(\u0027/etc/passwd\u0027);\n}\n```\n\n### Patches\nThe vulnerability has been addressed in version `1.7`. Users should upgrade to this version to mitigate the vulnerability.\n\n### Workarounds\nUsers can mitigate the vulnerability by ensuring that their admin accounts are secured with strong passwords and other best practices for account security. Additionally, users can limit the exposure of sensitive files on the server by implementing appropriate file permissions and access controls.\n",
  "id": "GHSA-vhm8-wwrf-3gcw",
  "modified": "2023-03-13T20:52:11Z",
  "published": "2023-03-13T20:52:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/flarum/framework/security/advisories/GHSA-vhm8-wwrf-3gcw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-27577"
    },
    {
      "type": "WEB",
      "url": "https://github.com/flarum/framework/commit/1761660c98ea5a3e9665fb8e6041d1f2ee62a444"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/flarum/flarum-core"
    },
    {
      "type": "WEB",
      "url": "https://github.com/flarum/flarum-core/releases/tag/v1.7.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Path Traversal Vulnerability in `LESS` Parser allows reading of sensitive server files"
}

CVE-2023-27577 (GCVE-0-2023-27577)

Vulnerability from cvelistv5 – Published: 2023-03-10 20:56 – Updated: 2025-02-25 14:58

Title

Path Traversal Vulnerability in `LESS` Parser allows reading of sensitive server files in flarum

Summary

flarum is a forum software package for building communities. In versions prior to 1.7.0 an admin account which has already been compromised by an attacker may use a vulnerability in the `LESS` parser which can be exploited to read sensitive files on the server through the use of path traversal techniques. An attacker can achieve this by providing an absolute path to a sensitive file in the custom `LESS` setting, which the `LESS` parser will then read. For example, an attacker could use the following code to read the contents of the `/etc/passwd` file on a linux machine. The scope of what files are vulnerable will depend on the permissions given to the running flarum process. The vulnerability has been addressed in version `1.7`. Users should upgrade to this version to mitigate the vulnerability. Users unable to upgrade may mitigate the vulnerability by ensuring that their admin accounts are secured with strong passwords and follow other best practices for account security. Additionally, users can limit the exposure of sensitive files on the server by implementing appropriate file permissions and access controls at the operating system level.

Severity ?

6.6 (Medium)


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

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/flarum/framework/security/advi…	x_refsource_CONFIRM
	https://github.com/flarum/framework/commit/176166…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	flarum	framework	Affected: < 1.7.0

Show details on NVD website