Summary
Using the create_from_blueprint builtin can result in a double eval vulnerability when raw_args=True and the args argument has side-effects.
A contract search was performed and no vulnerable contracts were found in production. In particular, the raw_args variant of create_from_blueprint was not found to be used in production.
Details
It can be seen that the _build_create_IR function of the create_from_blueprint builtin doesn't cache the mentioned args argument to the stack: https://github.com/vyperlang/vyper/blob/cedf7087e68e67c7bfbd47ae95dcb16b81ad2e02/vyper/builtins/functions.py#L1847
As such, it can be evaluated multiple times (instead of retrieving the value from the stack).
PoC
The vulnerability is demonstrated in the following boa test:
src1 = """
c: uint256
"""
deployer = """
created_address: public(address)
deployed: public(uint256)
@external
def get() -> Bytes[32]:
self.deployed += 1
return b''
@external
def create_(target: address):
self.created_address = create_from_blueprint(target, raw_call(self, method_id("get()"), max_outsize=32), raw_args=True, code_offset=3)
"""
Factory = b.loads_partial(src1)
c = Factory.deploy_as_blueprint()
c2 = b.loads(deployer, b'')
c2.create_(c)
c2.deployed()The output of c2.deployed() is 2 although create_ was called only once and the value was initialized to 0.
Impact
No vulnerable production contracts were found. Additionally, double evaluation of side-effects should be easily discoverable in client tests. As such, the impact is low.
References
Summary
Using the
create_from_blueprintbuiltin can result in a double eval vulnerability whenraw_args=Trueand theargsargument has side-effects.A contract search was performed and no vulnerable contracts were found in production. In particular, the
raw_argsvariant ofcreate_from_blueprintwas not found to be used in production.Details
It can be seen that the
_build_create_IRfunction of thecreate_from_blueprintbuiltin doesn't cache the mentionedargsargument to the stack: https://github.com/vyperlang/vyper/blob/cedf7087e68e67c7bfbd47ae95dcb16b81ad2e02/vyper/builtins/functions.py#L1847As such, it can be evaluated multiple times (instead of retrieving the value from the stack).
PoC
The vulnerability is demonstrated in the following
boatest:The output of
c2.deployed()is2althoughcreate_was called only once and the value was initialized to0.Impact
No vulnerable production contracts were found. Additionally, double evaluation of side-effects should be easily discoverable in client tests. As such, the impact is
low.References