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GHSA-4v7v-gqf9-ww2g
vyperImpact
When we pass a multi-dimensional array (like [[1, 2], [3, 4]]) as an argument to internal/external functions we get incorrect output. This is due to a stack management issue, because it was assumed that the size of each subtype of an array/struct is 32, which is not always correct.
Example code:
@internal
def test_input(arr: int128[2][1], i: int128) -> (int128[2][1], int128):
return arr, i
@external
def test_values(arr: int128[2][1], i: int128) -> (int128[2][1], int128):
return self.test_input(arr, i)
Please see #2183 for further information
Patches
This problem was fixed in #2184, and released as a part of v0.2.6.
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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.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
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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