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cvelistGitHub_MCVELIST:CVE-2024-24560
HistoryFeb 02, 2024 - 4:19 p.m.

CVE-2024-24560 Vyper external calls can overflow return data to return input buffer

2024-02-0216:19:45
CWE-119
GitHub_M
www.cve.org
1
cve-2024-24560
vyper
pythonic smart contract language
ethereum virtual machine
buffer overflow
abiv2
data validation

3.7 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

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

5.6 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

17.0%

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. When calls to external contracts are made, we write the input buffer starting at byte 28, and allocate the return buffer to start at byte 0 (overlapping with the input buffer). When checking RETURNDATASIZE for dynamic types, the size is compared only to the minimum allowed size for that type, and not to the returned value’s length. As a result, malformed return data can cause the contract to mistake data from the input buffer for returndata. When the called contract returns invalid ABIv2 encoded data, the calling contract can read different invalid data (from the dirty buffer) than the called contract returned.

CNA Affected

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

3.7 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

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

5.6 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

17.0%

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