CVE-2024-34707: Nautobot Nautobot's BANNER_* Configuration Can Be Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-r2hr-4v48-fjv3",
  "modified" : "2024-05-14T20:04:15Z",
  "published" : "2024-05-13T19:59:26Z",
  "aliases" : [ "CVE-2024-34707" ],
  "summary" : "Nautobot's BANNER_* configuration can be used to inject arbitrary HTML content into Nautobot pages",
  "details" : "### Impact\n\nA Nautobot user with admin privileges can modify the `BANNER_TOP`, `BANNER_BOTTOM`, and `BANNER_LOGIN` configuration settings via the `/admin/constance/config/` endpoint. Normally these settings are used to provide custom banner text at the top and bottom of all Nautobot web pages (or specifically on the login page in the case of `BANNER_LOGIN`) but it was reported that an admin user can make use of these settings to inject arbitrary HTML, potentially exposing Nautobot users to security issues such as cross-site scripting (stored XSS).\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nPatches will be released as part of Nautobot 1.6.22 and 2.2.4.\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nAs [described in the Nautobot documentation](https://docs.nautobot.com/projects/core/en/stable/user-guide/administration/configuration/optional-settings/#administratively-configurable-settings), these settings are only configurable through the admin UI of Nautobot if they are *not* explicitly set to some non-empty value in the `nautobot_config.py` or equivalent Nautobot configuration file. Therefore, adding the following configuration to said file completely mitigates this vulnerability in both Nautobot 1.x and 2.x:\n\n```python\nBANNER_LOGIN = \" \"\nBANNER_TOP = \" \"\nBANNER_BOTTOM = \" \"\n```\n\nor alternately (Nautobot 2.x only), if those variables are not defined explicitly in your configuration file, setting the following environment variables for the Nautobot user account serves the same purpose:\n\n```shell\nNAUTOBOT_BANNER_LOGIN=\" \"\nNAUTOBOT_BANNER_TOP=\" \"\nNAUTOBOT_BANNER_BOTTOM=\" \"\n```\n\nLimiting all users who do not need elevated privileges to non-admin access (`is_superuser: False` and `is_staff: False`) is a partial mitigation as well.\n\n\n### References\n\n- https://github.com/nautobot/nautobot/pull/5697\n- https://github.com/nautobot/nautobot/pull/5698",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:H/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "nautobot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.6.22"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "nautobot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.2.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/nautobot/nautobot/security/advisories/GHSA-r2hr-4v48-fjv3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-34707"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nautobot/nautobot/pull/5697"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nautobot/nautobot/pull/5698"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nautobot/nautobot/commit/4f0a66bd6307bfe0e0acb899233e0d4ad516f51c"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nautobot/nautobot/commit/f640aedc69c848d3d1be57f0300fc40033ff6423"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/nautobot/nautobot"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-05-13T19:59:26Z",
    "nvd_published_at" : "2024-05-14T15:39:30Z"
  }
}