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GHSA-2r3x-4mrv-mcxf
vyperImpact
When performing a function call inside a tuple or as an argument inside another function call, there is a memory corruption issue that occurs because of an incorrect pointer to the the tip of the stack.
Example code:
@internal
def _foo(a: uint256, b: uint256, c: uint256) -> (uint256, uint256, uint256, uint256, uint256):
return 1, a, b, c, 5
@internal
def _foo2() -> uint256:
a: uint256[10] = [6,7,8,9,10,11,12,13,15,16]
return 4
@external
def foo() -> (uint256, uint256, uint256, uint256, uint256):
return self._foo(2, 3, self._foo2())
Please see #2186 for further information
Patches
This problem was fixed in #2186, 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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