CVE-2024-32646 vyper performs double eval of the slice args when buffer from adhoc locations

2024-04-2517:21:59

CWE-20

GitHub_M

www.cve.org

vyper

double eval

vulnerability

slice builtin

adhoc locations

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS

Percentile

9.0%

JSON

Vyper is a pythonic Smart Contract Language for the Ethereum virtual machine. In versions 0.3.10 and prior, using the slice builtin can result in a double eval vulnerability when the buffer argument is either msg.data, self.code or <address>.code and either the start or length arguments have side-effects. It can be easily triggered only with the versions <0.3.4 as 0.3.4 introduced the unique symbol fence. 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. As of time of publication, no fixed versions are available.

CNA Affected

[
  {
    "vendor": "vyperlang",
    "product": "vyper",
    "versions": [
      {
        "version": "<= 0.3.10",
        "status": "affected"
      }
    ]
  }
]