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GHSA-vqmv-47xg-9wpr
No affected components available
Summary
Using pty.spawn, which is a built-in python library function to execute arbitrary commands on the host system.
Details
The attack payload executes in the following steps:
First, the attacker craft the payload by calling to pty.spawn function in the __reduce__ method. Then the victim attempts to use picklescan to scan the pickle file for issues and sees this -
----------- SCAN SUMMARY -----------
Scanned files: 1
Infected files: 0
Dangerous globals: 0
The victim proceeds to load the pickle file and execute attacker-injected arbitrary code.
PoC
class PtyExploit:
def __reduce__(self):
return (pty.spawn, (["/bin/sh", "-c", "id; exit"],))
Impact
Who is impacted? Any organization or individual relying on picklescan to detect malicious pickle files inside PyTorch models. What is the impact? Attackers can embed malicious code in pickle file that remains undetected but executes when the pickle file is loaded. Supply Chain Attack: Attackers can distribute infected pickle files across ML models, APIs, or saved Python objects.
Collaborators
https://github.com/ajohnston9 https://github.com/geo-lit
The vulnerability can be exploited over the network without needing physical access. 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.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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