29 lines
997 B
YAML
29 lines
997 B
YAML
cve: POSTCUT-002
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alias: Upload validator TOCTOU — image swap between validate and move
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cwe_primary: CWE-367
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cwe_acceptable: [CWE-367, CWE-362, CWE-22, CWE-434]
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target_file: source.py
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vuln_lines: [25, 26, 34, 35, 36, 37]
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severity: high
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vuln_class: toctou_race
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exploit_pattern_regex: '(toctou|race\s*condition|time[- ]of[- ]check|swap|replace.*file|symlink|inotify)'
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must_mention_any:
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- toctou
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- race condition
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- time-of-check
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- validate then move
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- swap file
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- symlink
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- between validation
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- between check
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- attacker replaces
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points: 30
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memorization_resistant: true
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notes: |
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Synthetic — novel pattern. Validate then move pattern with no atomic
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handle: attacker can replace the file at tmp_path between validate_image()
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(passes — real image) and shutil.move() (now moves the attacker's payload
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e.g. a PHP shell). Symlink swap or inotify-timed replacement works.
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X-Sendfile note hints that arbitrary content gets served regardless of
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extension — broader impact.
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