CVE-2022-29255

HIGH7.5EPSS 0.30%

Multiple evaluation of contract address in call in vyper

發布日:2022/6/6修改日:2024/11/19
也稱為:GHSA-4v9q-cgpw-cf38PYSEC-2022-43053

描述

### Impact when a calling an external contract with no return value, the contract address could be evaluated twice. this is usually only an efficiency problem, but if evaluation of the contract address has side effects, it could result in double evaluation of the side effects. in the following example, `Foo(msg.sender).bar()` is the contract address for the following call (to `.foo()`), and could get evaluated twice ```vyper interface Foo: def foo(): nonpayable def bar() -> address: nonpayable @external def do_stuff(): Foo(Foo(msg.sender).bar()).foo() ``` ### Patches 6b4d8ff185de071252feaa1c319712b2d6577f8d ### Workarounds assign contract addresses to variables. the above example would change to ```vyper @external def do_stuff(): t: Foo = Foo(msg.sender).bar() t.foo() ``` ### References ### For more information

受影響套件(2)

  • PyPI/vyperfrom 0, < 0.3.4
  • PyPI/vyperfrom 0, < 6b4d8ff185de071252feaa1c319712b2d6577f8d | from 0, < 0.3.4

CVSS 分數

來源版本嚴重程度向量
osvCVSS 4.0—CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
osvCVSS 3.1HIGH7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

參考連結(5)