pysec - pysec-2022-196

PYSEC-2022-196

Vulnerability from pysec - Published: 2022-04-04 18:15 - Updated: 2022-05-17 23:28

Details

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with "\x00" because there is no comparison of the length. A patch is available and expected to be part of the 0.3.2 release. There are currently no known workarounds.

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": "2c73f8352635c0a433423a5b94740de1a118e508"
            }
          ],
          "repo": "https://github.com/vyperlang/vyper",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.2"
            }
          ],
          "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"
      ]
    }
  ],
  "aliases": [
    "CVE-2022-24787",
    "GHSA-7vrm-3jc8-5wwm"
  ],
  "details": "Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with `\"\\x00\"` because there is no comparison of the length. A patch is available and expected to be part of the 0.3.2 release. There are currently no known workarounds.",
  "id": "PYSEC-2022-196",
  "modified": "2022-05-17T23:28:35.497395Z",
  "published": "2022-04-04T18:15:00Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-7vrm-3jc8-5wwm"
    }
  ]
}

CVE-2022-24787 (GCVE-0-2022-24787)

Vulnerability from cvelistv5 – Published: 2022-04-04 17:35 – Updated: 2025-04-23 18:41

Summary

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with `"\x00"` because there is no comparison of the length. A patch is available and expected to be part of the 0.3.2 release. There are currently no known workarounds.

Severity ?

7.5 (High)


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

CWE

CWE-697 - Incorrect Comparison

Assigner

GitHub_M

References

URL

Tags

	https://github.com/vyperlang/vyper/security/advis…	x_refsource_CONFIRM
	https://github.com/vyperlang/vyper/commit/2c73f83…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	vyperlang	vyper	Affected: <= 0.3.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "providerMetadata": {
          "dateUpdated": "2024-08-03T04:20:50.553Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-7vrm-3jc8-5wwm"
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            ],
            "url": "https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508"
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        ],
        "title": "CVE Program Container"
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        "metrics": [
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                "id": "CVE-2022-24787",
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      "metrics": [
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}

GHSA-7VRM-3JC8-5WWM

Vulnerability from github – Published: 2022-04-04 21:40 – Updated: 2022-04-06 17:39

Summary

Incorrect Comparison in Vyper

Details

Impact

bytestrings can have dirty bytes in them, resulting in the word-for-word comparison to give incorrect results, e.g.

b1: Bytes[32] = b"abcdef"
b1 = slice(b1, 0, 1)
b2: Bytes[32] = b"abcdef"
t: bool = b1 == b2  # incorrectly evaluates to True

even without dirty nonzero bytes, because there is no comparison of the length, two bytestrings can compare to equal if one ends with "\x00".

b1: Bytes[32] = b"abc\0"
b2: Bytes[32] = b"abc"
t: bool = b1 == b2  # incorrectly evaluates to True

Patches

fixed in https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508

Severity ?

7.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "vyper"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-697"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-04-04T21:40:45Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nbytestrings can have dirty bytes in them, resulting in the word-for-word comparison to give incorrect results, e.g.\n```vyper\nb1: Bytes[32] = b\"abcdef\"\nb1 = slice(b1, 0, 1)\nb2: Bytes[32] = b\"abcdef\"\nt: bool = b1 == b2  # incorrectly evaluates to True\n```\neven without dirty nonzero bytes, because there is no comparison of the length, two bytestrings can compare to equal if one ends with `\"\\x00\"`.\n```vyper\nb1: Bytes[32] = b\"abc\\0\"\nb2: Bytes[32] = b\"abc\"\nt: bool = b1 == b2  # incorrectly evaluates to True\n```\n\n### Patches\nfixed in https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508",
  "id": "GHSA-7vrm-3jc8-5wwm",
  "modified": "2022-04-06T17:39:02Z",
  "published": "2022-04-04T21:40:45Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-7vrm-3jc8-5wwm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2022-196.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vyperlang/vyper"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Incorrect Comparison in Vyper"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

PYSEC-2022-196

CVE-2022-24787 (GCVE-0-2022-24787)

GHSA-7VRM-3JC8-5WWM

Impact

Patches

Tags

Sightings

Nomenclature