{"id":"GHSA-hgwp-4vp4-qmm2","summary":"Local Privilege Escalation in cloudflared","details":"In `cloudflared` versions \u003c 2020.8.1 (corresponding to 0.0.0-20200820025921-9323844ea773 on pkg.go.dev) on Windows, if an administrator has started `cloudflared` and set it to read configuration files from a certain directory, an unprivileged user can exploit a misconfiguration in order to escalate privileges and execute system-level commands. The misconfiguration was due to the way that `cloudflared` reads its configuration file. One of the locations that `cloudflared` reads from (C:\\etc\\) is not a secure by default directory due to the fact that Windows does not enforce access controls on this directory without further controls applied. A malformed config.yaml file can be written by any user. Upon reading this config, `cloudflared` would output an error message to a log file defined in the malformed config. The user-controlled log file location could be set to a specific location that Windows will execute when any user logs in.","aliases":["CVE-2020-24356","GO-2022-0845"],"modified":"2026-09-10T03:49:14.744293855Z","published":"2021-05-24T16:56:35Z","database_specific":{"nvd_published_at":"2020-10-02T15:15:00Z","cwe_ids":["CWE-427"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2021-05-24T16:52:03Z"},"references":[{"type":"WEB","url":"https://github.com/cloudflare/cloudflared/security/advisories/GHSA-hgwp-4vp4-qmm2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-24356"},{"type":"WEB","url":"https://github.com/cloudflare/cloudflared/commit/9323844ea773b1444460fa09295ab8c01a88d97e"},{"type":"PACKAGE","url":"https://github.com/cloudflare/cloudflared"}],"affected":[{"package":{"name":"github.com/cloudflare/cloudflared","ecosystem":"Go","purl":"pkg:golang/github.com/cloudflare/cloudflared"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.0-20200820025921-9323844ea773"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-hgwp-4vp4-qmm2/GHSA-hgwp-4vp4-qmm2.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}