Vulnerability Information
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Vulnerability Title
Vyper's `concat()` builtin may elide side-effects for zero-length arguments
Vulnerability Description
Vyper is the Pythonic Programming Language for the Ethereum Virtual Machine. In versions up to and including 0.4.2rc1, `concat()` may skip evaluation of side effects when the length of an argument is zero. This is due to a fastpath in the implementation which skips evaluation of argument expressions when their length is zero. In practice, it would be very unusual in user code to construct zero-length bytestrings using an expression with side-effects, since zero-length bytestrings are typically constructed with the empty literal `b""`; the only way to construct an empty bytestring which has side effects would be with the ternary operator introduced in v0.3.8, e.g. `b"" if self.do_some_side_effect() else b""`. The fix is available in pull request 4644 and expected to be part of the 0.4.2 release. As a workaround, don't have side effects in expressions which construct zero-length bytestrings.
CVSS Information
N/A
Vulnerability Type
不充分的控制流管理
Vulnerability Title
Vyper 安全漏洞
Vulnerability Description
Vyper是vyperlang开源的一个 EVM 的 Pythonic 智能合约语言。 Vyper 0.4.2rc1及之前版本存在安全漏洞，该漏洞源于concat可能跳过副作用评估，当参数长度为零时。
CVSS Information
N/A
Vulnerability Type
N/A