{"id":"BIT-aspnet-core-2020-1045","summary":"Microsoft ASP.NET Core Security Feature Bypass Vulnerability","details":"\u003cp\u003eA security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.\u003c/p\u003e\n\u003cp\u003eThe ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded.\u003c/p\u003e\n\u003cp\u003eThe security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.\u003c/p\u003e","aliases":["CVE-2020-1045","GHSA-hxrm-9w7p-39cc"],"modified":"2026-09-08T08:45:36.243894483Z","published":"2024-03-06T10:54:08.693Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2020:3699"},{"type":"ADVISORY","url":"https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.8/3.1.8.md#changes-in-318"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LN2FUVBSVPGK7AU3NMLO3YR6CGONQPB/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ASICXQXS4M7MTAF6SGQMCLCA63DLCUT3/"},{"type":"ADVISORY","url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045"},{"type":"ADVISORY","url":"https://security.snyk.io/vuln/SNYK-RHEL8-DOTNET-1439600"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-1045"}],"affected":[{"package":{"name":"aspnet-core","ecosystem":"Bitnami","purl":"pkg:bitnami/aspnet-core"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.1.0"},{"fixed":"3.1.8"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/aspnet-core/BIT-aspnet-core-2020-1045.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}],"schema_version":"1.9.0"}