GHSA-6H3F-43G6-3HQH

Vulnerability from github – Published: 2026-08-05 15:32 – Updated: 2026-08-05 15:32
VLAI
Details

Fledge's backup-restore upload handler, upload_backup() (python/fledge/services/core/api/backup_restore.py), takes the first extracted tar member's filename (tar_file_names[0]) and builds a shell command via string formatting: cmd = "cp {} {}".format(source, backup_path); ret_code = os.system(cmd). The only pre-check on the filename is a prefix/suffix match (startswith(backup_prefix), endswith(valid_extensions)), which a name such as fledge_backup_$(id>/tmp/pwn).db satisfies while still injecting a shell command substitution. Because os.system() invokes a shell and no quoting (shlex.quote, list-form subprocess) is applied, an admin uploading a crafted backup archive achieves arbitrary OS command execution.

Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-71284"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-05T13:24:53Z",
    "severity": "HIGH"
  },
  "details": "Fledge\u0027s backup-restore upload handler, upload_backup() (python/fledge/services/core/api/backup_restore.py), takes the first extracted tar member\u0027s filename (tar_file_names[0]) and builds a shell command via string formatting: `cmd = \"cp {} {}\".format(source, backup_path); ret_code = os.system(cmd)`. The only pre-check on the filename is a prefix/suffix match (startswith(backup_prefix), endswith(valid_extensions)), which a name such as `fledge_backup_$(id\u003e/tmp/pwn).db` satisfies while still injecting a shell command substitution. Because os.system() invokes a shell and no quoting (shlex.quote, list-form subprocess) is applied, an admin uploading a crafted backup archive achieves arbitrary OS command execution.",
  "id": "GHSA-6h3f-43g6-3hqh",
  "modified": "2026-08-05T15:32:21Z",
  "published": "2026-08-05T15:32:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71284"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fledge-iot/fledge"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fledge-iot/fledge/blob/main/python/fledge/services/core/api/backup_restore.py"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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