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_$(id>/tmp/pwn).db` satisfies while still injecting a shell command substitution. Because os.system() invokes a shell and no quoting (shlex.quote, list-form subprocess) is applied, an admin uploading a crafted backup archive achieves arbitrary OS command execution.
Metrics
Affected Vendors & Products
References
History
Wed, 05 Aug 2026 16:30:00 +0000
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ssvc
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Wed, 05 Aug 2026 13:15:00 +0000
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| Description | Fledge's backup-restore upload handler, upload_backup() (python/fledge/services/core/api/backup_restore.py), takes the first extracted tar member's filename (tar_file_names[0]) and builds a shell command via string formatting: `cmd = "cp {} {}".format(source, backup_path); ret_code = os.system(cmd)`. The only pre-check on the filename is a prefix/suffix match (startswith(backup_prefix), endswith(valid_extensions)), which a name such as `fledge_backup_$(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. | |
| Title | Fledge IoT Gateway Backup Restore OS Command Injection via Tar Member Filename | |
| Weaknesses | CWE-78 | |
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cvssV3_1
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Status: PUBLISHED
Assigner: TuranSec
Published:
Updated: 2026-08-05T15:52:42.370Z
Reserved: 2026-08-05T12:23:34.968Z
Link: CVE-2026-71284
Updated: 2026-08-05T15:52:38.812Z
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OpenCVE Enrichment
Updated: 2026-08-05T15:15:05Z