GHSA-3p37-3636-q8wv

Опубликовано: 12 мая 2023

Источник: github

Github: Прошло ревью

CVSS4: 8.7

CVSS3: 7.5

Описание

Vyper vulnerable to OOB DynArray access when array is on both LHS and RHS of an assignment

Impact

during codegen, the length word of a dynarray is written before the data, which can result in OOB array access in the case where the dynarray is on both the lhs and rhs of an assignment. here is a minimal example producing the issue:

a:DynArray[uint256,3] @external def test() -> DynArray[uint256,3]: self.a = [1,2,3] self.a = empty(DynArray[uint256,3]) self.a = [self.a[0],self.a[1],self.a[2]] return self.a # return [1,2,3]

and here is an example demonstrating the issue can cause data corruption across call frames:

@external def test() -> DynArray[uint256,3]: self.a() return self.b() # return [1,2,3] @internal def a(): a: uint256 = 0 b: uint256 = 1 c: uint256 = 2 d: uint256 = 3 @internal def b() -> DynArray[uint256,3]: a: DynArray[uint256,3] = empty(DynArray[uint256,3]) a = [a[0],a[1],a[2]] return a

examples involving append and pop:

@internal def foo(): c: DynArray[uint256, 1] = [] c.append(c[0])

@internal def foo(): c: DynArray[uint256, 1] = [1] c[0] = c.pop()

the expected behavior in all of the above cases is to revert due to oob array access.

Patches

patched in 4f8289a81206f767df1900ac48f485d90fc87edb

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

References

Are there any links users can visit to find out more?

Ссылки

Пакеты

Наименование

vyper

pip

Затронутые версииВерсия исправления

< 0.3.8

0.3.8

EPSS

Процентиль: 43%

0.00206

Низкий

8.7 High

CVSS4

7.5 High

CVSS3

CVE ID

CVE-2023-31146

Дефекты

CWE-787

Связанные уязвимости

CVE-2023-31146

CVSS3: 7.5

nvd

больше 2 лет назад

Vyper is a Pythonic smart contract language for the Ethereum virtual machine. Prior to version 0.3.8, during codegen, the length word of a dynarray is written before the data, which can result in out-of-bounds array access in the case where the dynarray is on both the lhs and rhs of an assignment. The issue can cause data corruption across call frames. The expected behavior is to revert due to out-of-bounds array access. Version 0.3.8 contains a patch for this issue.

EPSS

Процентиль: 43%

0.00206

Низкий

8.7 High

CVSS4

7.5 High

CVSS3

CVE ID

CVE-2023-31146

Дефекты

CWE-787