GHSA-C3H4-9GC2-F7H4

Vulnerability from github – Published: 2024-07-29 16:44 – Updated: 2024-07-29 16:44
VLAI?
Summary
tgstation-server's DreamMaker environment files outside the deployment directory can be compiled and ran by insufficiently permissioned users
Details

Impact

What kind of vulnerability is it? Who is impacted?

Low permission users using the "Set .dme Path" privilege could potentially set malicious .dme files existing on the host machine to be compiled and executed.

These .dme files could be uploaded via tgstation-server (requiring a separate, isolated privilege) or some other means.

A server configured to execute in BYOND's trusted security level (requiring a third separate, isolated privilege OR being set by another user) could lead to this escalating into remote code execution via BYOND's shell() proc.

The ability to execute this kind of attack is a known side effect of having privileged TGS users, but normally requires multiple privileges with known weaknesses. This vector is not intentional as it does not require control over the where deployment code is sourced from and may not require remote write access to an instance's Configuration directory.

Patches

Has the problem been patched? What versions should users upgrade to?

This problem is patched by pull request #1835 and fixed in versions 6.8.0 and above.

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

Do not give un-trusted users the Deployment permission to set a .dme path on instances.

Severity ?
8.4 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:H
7.3 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:H/SC:H/SI:L/SA:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Tgstation.Server.Api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "6.8.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Tgstation.Server.Host"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "6.8.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-41799"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-07-29T16:44:15Z",
    "nvd_published_at": "2024-07-29T15:15:16Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nLow permission users using the \"Set .dme Path\" privilege could potentially set malicious .dme files existing on the host machine to be compiled and executed. \n\nThese .dme files could be uploaded via tgstation-server (requiring a separate, isolated privilege) or some other means.\n\nA server configured to execute in BYOND\u0027s trusted security level (requiring a third separate, isolated privilege OR being set by another user) could lead to this escalating into remote code execution via BYOND\u0027s shell() proc.\n\nThe ability to execute this kind of attack is a known side effect of having privileged TGS users, but normally requires multiple privileges with known weaknesses. This vector is not intentional as it does not require control over the where deployment code is sourced from and _may_ not require remote write access to an instance\u0027s `Configuration` directory.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nThis problem is patched by pull request #1835 and fixed in versions 6.8.0 and above.\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nDo not give un-trusted users the Deployment permission to set a .dme path on instances.\n",
  "id": "GHSA-c3h4-9gc2-f7h4",
  "modified": "2024-07-29T16:44:15Z",
  "published": "2024-07-29T16:44:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tgstation/tgstation-server/security/advisories/GHSA-c3h4-9gc2-f7h4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-41799"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tgstation/tgstation-server/pull/1835"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tgstation/tgstation-server/commit/374852fe5ae306415eb5aafb2d16b06897d7afe4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tgstation/tgstation-server"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:H/SC:H/SI:L/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "tgstation-server\u0027s DreamMaker environment files outside the deployment directory can be compiled and ran by insufficiently permissioned users"
}


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  • 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.