{"api_version":"1","generated_at":"2026-04-23T11:35:06+00:00","cve":"CVE-2019-18684","urls":{"html":"https://cve.report/CVE-2019-18684","api":"https://cve.report/api/cve/CVE-2019-18684.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2019-18684","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-18684"},"summary":{"title":"CVE-2019-18684","description":"** DISPUTED ** Sudo through 1.8.29 allows local users to escalate to root if they have write access to file descriptor 3 of the sudo process. This occurs because of a race condition between determining a uid, and the setresuid and openat system calls. The attacker can write \"ALL ALL=(ALL) NOPASSWD:ALL\" to /proc/#####/fd/3 at a time when Sudo is prompting for a password. NOTE: This has been disputed due to the way Linux /proc works. It has been argued that writing to /proc/#####/fd/3 would only be viable if you had permission to write to /etc/sudoers. Even with write permission to /proc/#####/fd/3, it would not help you write to /etc/sudoers.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2019-11-04 16:15:00","updated_at":"2023-11-07 03:06:00"},"problem_types":["CWE-362"],"metrics":[],"references":[{"url":"https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbd","name":"https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbd","refsource":"MISC","tags":["Exploit","Third Party Advisory"],"title":"Write to /etc/sudoers using file descriptor 3 on sudo's process while asking for a pass · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-18684","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-18684","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2019","cve_id":"18684","vulnerable":"1","versionEndIncluding":"1.8.29","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"sudo_project","cpe5":"sudo","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2019-18684","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"** DISPUTED ** Sudo through 1.8.29 allows local users to escalate to root if they have write access to file descriptor 3 of the sudo process. This occurs because of a race condition between determining a uid, and the setresuid and openat system calls. The attacker can write \"ALL ALL=(ALL) NOPASSWD:ALL\" to /proc/#####/fd/3 at a time when Sudo is prompting for a password. NOTE: This has been disputed due to the way Linux /proc works. It has been argued that writing to /proc/#####/fd/3 would only be viable if you had permission to write to /etc/sudoers. Even with write permission to /proc/#####/fd/3, it would not help you write to /etc/sudoers."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbd","refsource":"MISC","name":"https://gist.github.com/oxagast/51171aa161074188a11d96cbef884bbd"}]}},"nvd":{"publishedDate":"2019-11-04 16:15:00","lastModifiedDate":"2023-11-07 03:06:00","problem_types":["CWE-362"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":7,"baseSeverity":"HIGH"},"exploitabilityScore":1,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:L/AC:M/Au:N/C:C/I:C/A:C","accessVector":"LOCAL","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"COMPLETE","integrityImpact":"COMPLETE","availabilityImpact":"COMPLETE","baseScore":6.9},"severity":"MEDIUM","exploitabilityScore":3.4,"impactScore":10,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:sudo_project:sudo:*:*:*:*:*:*:*:*","versionEndIncluding":"1.8.29","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2019","CveId":"18684","Ordinal":"159160","Title":"CVE-2019-18684","CVE":"CVE-2019-18684","Year":"2019"},"notes":[{"CveYear":"2019","CveId":"18684","Ordinal":"1","NoteData":"** DISPUTED ** Sudo through 1.8.29 allows local users to escalate to root if they have write access to file descriptor 3 of the sudo process. This occurs because of a race condition between determining a uid, and the setresuid and openat system calls. The attacker can write \"ALL ALL=(ALL) NOPASSWD:ALL\" to /proc/#####/fd/3 at a time when Sudo is prompting for a password. NOTE: This has been disputed due to the way Linux /proc works. It has been argued that writing to /proc/#####/fd/3 would only be viable if you had permission to write to /etc/sudoers. Even with write permission to /proc/#####/fd/3, it would not help you write to /etc/sudoers.","Type":"Description","Title":null},{"CveYear":"2019","CveId":"18684","Ordinal":"2","NoteData":"2019-11-04","Type":"Other","Title":"Published"},{"CveYear":"2019","CveId":"18684","Ordinal":"3","NoteData":"2019-11-07","Type":"Other","Title":"Modified"}]}}}