CVE-2023-42460

_abi_decode input not validated in complex expressions in Vyper

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

Vyper is a Pythonic Smart Contract Language for the EVM. The `_abi_decode()` function does not validate input when it is nested in an expression. Uses of `_abi_decode()` can be constructed which allow for bounds checking to be bypassed resulting in incorrect results. This issue has not yet been fixed, but a fix is expected in release `0.3.10`. Users are advised to reference pull request #3626.

Vyper es un Pythonic Smart Contract Language para EVM. La función `_abi_decode()` no valida la entrada cuando está anidada en una expresión. Se pueden crear usos de `_abi_decode()` que permitan omitir la verificación de los límites, lo que generará resultados incorrectos. Este problema aún no se ha solucionado, pero se espera que se solucione en la versión `0.3.10`. Se recomienda a los usuarios que hagan referencia al pull request #3626.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-09-08 CVE Reserved
2023-09-26 CVE Published
2024-09-24 CVE Updated
2024-09-24 First Exploit
2024-10-28 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-682: Incorrect Calculation

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://github.com/vyperlang/vyper/security/advisories/GHSA-cx2q-hfxr-rj97	2024-09-24

URL	Date	SRC
https://github.com/vyperlang/vyper/pull/3626	2023-09-29

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Vyperlang Search vendor "Vyperlang"		Vyper Search vendor "Vyperlang" for product "Vyper"				>= 0.3.4 < 0.3.10 Search vendor "Vyperlang" for product "Vyper" and version " >= 0.3.4 < 0.3.10"		python		Affected