{"id":"GHSA-6r8q-pfpv-7cgj","summary":"Vyper vulnerable to integer overflow in loop","details":"### Impact\n\nDue to missing overflow check for loop variables, by assigning the iterator of a loop to a variable, it is possible to overflow the type of the latter.\n\nIn the following example, calling `test` returns `354`, meaning that the variable `a` did store `354` a value out of bound for the type `uint8`.\n\n```Vyper\n@external\ndef test() -\u003e uint16:\n    x:uint8 = 255\n    a:uint8 = 0\n    for i in range(x, x+100):\n        a = i\n    return convert(a,uint16)\n```\n\nThe issue seems to happen only in loops of type `for i in range(a, a + N)` as in loops of type `for i in range(start, stop)` and `for i in range(stop)`, the compiler is able to raise a `TypeMismatch` when trying to overflow the variable.\n\nthanks to @trocher for reporting\n\n### Patches\n\npatched in 3de1415ee77a9244eb04bdb695e249d3ec9ed868\n\n### Workarounds\n\n ","aliases":["CVE-2023-32058","PYSEC-2023-78"],"modified":"2024-11-19T16:46:47.757796Z","published":"2023-05-12T20:21:35Z","database_specific":{"cwe_ids":["CWE-190"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2023-05-12T20:21:35Z","nvd_published_at":"2023-05-11T21:15:10Z"},"references":[{"type":"WEB","url":"https://github.com/vyperlang/vyper/security/advisories/GHSA-6r8q-pfpv-7cgj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-32058"},{"type":"WEB","url":"https://github.com/vyperlang/vyper/commit/3de1415ee77a9244eb04bdb695e249d3ec9ed868"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-78.yaml"},{"type":"PACKAGE","url":"https://github.com/vyperlang/vyper"}],"affected":[{"package":{"name":"vyper","ecosystem":"PyPI","purl":"pkg:pypi/vyper"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.8"}]}],"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","0.3.2","0.3.3","0.3.4","0.3.5","0.3.6","0.3.7"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/05/GHSA-6r8q-pfpv-7cgj/GHSA-6r8q-pfpv-7cgj.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}