Vulnerability-Lookup

CVE-2024-24564 (GCVE-0-2024-24564)

Vulnerability from cvelistv5 – Published: 2024-02-26 20:16 – Updated: 2024-10-25 20:33

Title

Vyper extract32 can ready dirty memory

Summary

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. When using the built-in `extract32(b, start)`, if the `start` index provided has for side effect to update `b`, the byte array to extract `32` bytes from, it could be that some dirty memory is read and returned by `extract32`. This vulnerability is fixed in 0.4.0.

Severity

3.7 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-08-09 16:54 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/vyperlang/vyper/security/advis…	x_refsource_CONFIRM
https://github.com/vyperlang/vyper/commit/3d9c537…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
vyperlang	vyper	Affected: < 0.4.0	guessed
vyperlang	vyper	Affected: 0 , < 0.4.0 (custom) cpe:2.3:a:vyperlang:vyper::::::::

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2024-24564

Vulnerability from fkie_nvd - Published: 2024-02-26 20:19 - Updated: 2026-06-17 07:14

Severity

3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/vyperlang/vyper/commit/3d9c537142fb99b2672f21e2057f5f202cde194f	Patch
security-advisories@github.com	https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx	Exploit, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	vyperlang	vyper	*

JSON

To clipboard

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              "matchCriteriaId": "CEC5BCE2-DB5C-49EB-A302-F11E4E02F9BD",
              "versionEndExcluding": "0.4.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. When using the built-in `extract32(b, start)`, if the `start` index provided has for side effect to update `b`, the byte array to extract `32` bytes from, it could be that some dirty memory is read and returned by `extract32`. This vulnerability is fixed in 0.4.0."
    },
    {
      "lang": "es",
      "value": "Vyper es un lenguaje de contrato inteligente pit\u00f3nico para la m\u00e1quina virtual ethereum. Cuando se utiliza el `extract32(b, start)` integrado, si el \u00edndice `start` proporcionado tiene como efecto secundario actualizar `b`, la matriz de bytes de la que extraer `32` bytes, podr\u00eda ser que \"extract32\" lea y devuelva algo de memoria sucia. Esta vulnerabilidad afecta a la versi\u00f3n 0.3.10 y versiones anteriores."
    }
  ],
  "id": "CVE-2024-24564",
  "lastModified": "2026-06-17T07:14:36.980",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 3.7,
          "baseSeverity": "LOW",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-24564",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-08-09T16:54:00.551575Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-02-26T20:19:05.627",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/vyperlang/vyper/commit/3d9c537142fb99b2672f21e2057f5f202cde194f"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-4HWQ-4CPM-8VMX

Vulnerability from github – Published: 2024-02-26 20:11 – Updated: 2025-01-21 17:54

Summary

Vyper's `extract32` can ready dirty memory

Details

Summary

When using the built-in extract32(b, start), if the start index provided has for side effect to update b, the byte array to extract 32 bytes from, it could be that some dirty memory is read and returned by extract32.

As of v0.4.0 (specifically, commit https://github.com/vyperlang/vyper/commit/3d9c537142fb99b2672f21e2057f5f202cde194f), the compiler will panic instead of generating bytecode.

Details

Before evaluating start, the function Extract32.build_IR caches only:

The pointer in memory/storage to b: https://github.com/vyperlang/vyper/blob/10564dcc37756f3d3684b7a91fd8f4325a38c4d8/vyper/builtins/functions.py#L916-L918
The length of b: https://github.com/vyperlang/vyper/blob/10564dcc37756f3d3684b7a91fd8f4325a38c4d8/vyper/builtins/functions.py#L920-L922

but do not cache the actual content of b. This means that if the evaluation of start changes b's content and length, an outdated length will be used with the new content when extracting 32 bytes from b.

PoC

Calling the function foo of the following contract returns b'uuuuuuuuuuuuuuuuuuuuuuuuuuu\x00\x00789' meaning that extract32 accessed some dirty memory.

var:Bytes[96]

@internal
def bar() -> uint256:
    self.var = b'uuuuuuuuuuuuuuuuuuuuuuuuuuuuuu'
    self.var = b''
    return 3

@external
def foo() -> bytes32:
    self.var = b'abcdefghijklmnopqrstuvwxyz123456789'
    return extract32(self.var, self.bar(), output_type=bytes32)
    # returns b'uuuuuuuuuuuuuuuuuuuuuuuuuuu\x00\x00789'

Impact

For contracts that are affected, it means that calling extract32 returns dirty memory bytes instead of some expected output.

Severity

3.7 (Low)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.3.10"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "vyper"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-24564"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-02-26T20:11:35Z",
    "nvd_published_at": "2024-02-26T20:19:05Z",
    "severity": "LOW"
  },
  "details": "### Summary\n\nWhen using the built-in `extract32(b, start)`, if the `start` index provided has for side effect to update `b`, the byte array to extract `32` bytes from, it could be that some dirty memory is read and returned by `extract32`.\n\nAs of v0.4.0 (specifically, commit https://github.com/vyperlang/vyper/commit/3d9c537142fb99b2672f21e2057f5f202cde194f), the compiler will panic instead of generating bytecode.\n\n### Details\n\nBefore evaluating `start`, the function `Extract32.build_IR` caches only:\n\n- The pointer in memory/storage to `b`: https://github.com/vyperlang/vyper/blob/10564dcc37756f3d3684b7a91fd8f4325a38c4d8/vyper/builtins/functions.py#L916-L918\n- The length of `b`: https://github.com/vyperlang/vyper/blob/10564dcc37756f3d3684b7a91fd8f4325a38c4d8/vyper/builtins/functions.py#L920-L922\n\nbut do not cache the actual content of `b`. This means that if the evaluation of `start` changes `b`\u0027s content and length, an outdated length will be used with the new content when extracting 32 bytes from `b`.\n\n### PoC\n\nCalling the function `foo` of the following contract returns `b\u0027uuuuuuuuuuuuuuuuuuuuuuuuuuu\\x00\\x00789\u0027` meaning that `extract32` accessed some dirty memory.\n\n```Vyper\nvar:Bytes[96]\n\n@internal\ndef bar() -\u003e uint256:\n    self.var = b\u0027uuuuuuuuuuuuuuuuuuuuuuuuuuuuuu\u0027\n    self.var = b\u0027\u0027\n    return 3\n\n@external\ndef foo() -\u003e bytes32:\n    self.var = b\u0027abcdefghijklmnopqrstuvwxyz123456789\u0027\n    return extract32(self.var, self.bar(), output_type=bytes32)\n    # returns b\u0027uuuuuuuuuuuuuuuuuuuuuuuuuuu\\x00\\x00789\u0027\n```\n\n### Impact\n\nFor contracts that are affected, it means that calling `extract32` returns dirty memory bytes instead of some expected output.",
  "id": "GHSA-4hwq-4cpm-8vmx",
  "modified": "2025-01-21T17:54:09Z",
  "published": "2024-02-26T20:11:35Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-24564"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vyperlang/vyper/commit/3d9c537142fb99b2672f21e2057f5f202cde194f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2024-205.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vyperlang/vyper"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vyperlang/vyper/blob/10564dcc37756f3d3684b7a91fd8f4325a38c4d8/vyper/builtins/functions.py#L916-L918"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vyperlang/vyper/blob/10564dcc37756f3d3684b7a91fd8f4325a38c4d8/vyper/builtins/functions.py#L920-L922"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Vyper\u0027s `extract32` can ready dirty memory"
}

GSD-2024-24564

Vulnerability from gsd - Updated: 2024-01-26 06:02

Details

Aliases

CVE-2024-24564

JSON

To clipboard

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2024-24564"
      ],
      "details": "Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. When using the built-in `extract32(b, start)`, if the `start` index provided has for side effect to update `b`, the byte array to extract `32` bytes from, it could be that some dirty memory is read and returned by `extract32`. This vulnerability affects 0.3.10 and earlier versions.",
      "id": "GSD-2024-24564",
      "modified": "2024-01-26T06:02:26.105218Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2024-24564",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "vyper",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "\u003c= 0.3.10"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "vyperlang"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. When using the built-in `extract32(b, start)`, if the `start` index provided has for side effect to update `b`, the byte array to extract `32` bytes from, it could be that some dirty memory is read and returned by `extract32`. This vulnerability affects 0.3.10 and earlier versions."
          }
        ]
      },
      "impact": {
        "cvss": [
          {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "cweId": "CWE-125",
                "lang": "eng",
                "value": "CWE-125: Out-of-bounds Read"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx",
            "refsource": "MISC",
            "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-4hwq-4cpm-8vmx",
        "discovery": "UNKNOWN"
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. When using the built-in `extract32(b, start)`, if the `start` index provided has for side effect to update `b`, the byte array to extract `32` bytes from, it could be that some dirty memory is read and returned by `extract32`. This vulnerability affects 0.3.10 and earlier versions."
          }
        ],
        "id": "CVE-2024-24564",
        "lastModified": "2024-02-26T22:10:40.463",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 3.7,
                "baseSeverity": "LOW",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 1.4,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2024-02-26T20:19:05.627",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-125"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}

PYSEC-2024-205

Vulnerability from pysec - Published: 2024-02-26 20:19 - Updated: 2025-01-19 19:19

Details

Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. When using the built-in extract32(b, start), if the start index provided has for side effect to update b, the byte array to extract 32 bytes from, it could be that some dirty memory is read and returned by extract32. This vulnerability is fixed in 0.4.0.

Severity

5.3 (Medium)


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

Impacted products

Name	purl
vyper	pkg:pypi/vyper

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "vyper",
        "purl": "pkg:pypi/vyper"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3d9c537142fb99b2672f21e2057f5f202cde194f"
            }
          ],
          "repo": "https://github.com/vyperlang/vyper",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0b1",
        "0.1.0b10",
        "0.1.0b11",
        "0.1.0b12",
        "0.1.0b13",
        "0.1.0b14",
        "0.1.0b15",
        "0.1.0b16",
        "0.1.0b17",
        "0.1.0b2",
        "0.1.0b3",
        "0.1.0b4",
        "0.1.0b5",
        "0.1.0b6",
        "0.1.0b7",
        "0.1.0b8",
        "0.1.0b9",
        "0.2.1",
        "0.2.10",
        "0.2.11",
        "0.2.12",
        "0.2.13",
        "0.2.14",
        "0.2.15",
        "0.2.16",
        "0.2.2",
        "0.2.3",
        "0.2.4",
        "0.2.5",
        "0.2.6",
        "0.2.7",
        "0.2.8",
        "0.2.9",
        "0.3.0",
        "0.3.1",
        "0.3.10",
        "0.3.10rc1",
        "0.3.10rc2",
        "0.3.10rc3",
        "0.3.10rc4",
        "0.3.10rc5",
        "0.3.2",
        "0.3.3",
        "0.3.4",
        "0.3.5",
        "0.3.6",
        "0.3.7",
        "0.3.8",
        "0.3.9",
        "0.4.0b1",
        "0.4.0b2",
        "0.4.0b3",
        "0.4.0b4",
        "0.4.0b5",
        "0.4.0b6",
        "0.4.0rc1",
        "0.4.0rc2",
        "0.4.0rc3",
        "0.4.0rc4",
        "0.4.0rc5",
        "0.4.0rc6"
      ]
    }
  ],
  "aliases": [
    "CVE-2024-24564",
    "GHSA-4hwq-4cpm-8vmx"
  ],
  "details": "Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. When using the built-in `extract32(b, start)`, if the `start` index provided has for side effect to update `b`, the byte array to extract `32` bytes from, it could be that some dirty memory is read and returned by `extract32`. This vulnerability is fixed in 0.4.0.",
  "id": "PYSEC-2024-205",
  "modified": "2025-01-19T19:19:01.519824+00:00",
  "published": "2024-02-26T20:19:05+00:00",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vyperlang/vyper/commit/3d9c537142fb99b2672f21e2057f5f202cde194f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-4hwq-4cpm-8vmx"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2024-24564 (GCVE-0-2024-24564)

FKIE_CVE-2024-24564

GHSA-4HWQ-4CPM-8VMX

Summary

Details

PoC

Impact

GSD-2024-24564

PYSEC-2024-205

Tags

Sightings

Nomenclature

Related by attack behaviour