{"id":"UBUNTU-CVE-2021-23239","details":"The sudoedit personality of Sudo before 1.9.5 may allow a local unprivileged user to perform arbitrary directory-existence tests by winning a sudo_edit.c race condition in replacing a user-controlled directory by a symlink to an arbitrary path.","modified":"2026-02-04T03:46:27.811256Z","published":"2021-01-12T09:15:00Z","related":["USN-4705-1"],"upstream":["CVE-2021-23239"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-23239"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2021/01/11/2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4705-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-23239"}],"affected":[{"package":{"name":"sudo","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/sudo@1.8.9p5-1ubuntu1.5+esm8?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.6p3-0ubuntu3","1.8.8-2ubuntu1","1.8.8-2ubuntu2","1.8.9p4-1ubuntu1","1.8.9p4-1ubuntu2","1.8.9p5-1ubuntu1","1.8.9p5-1ubuntu1.1","1.8.9p5-1ubuntu1.2","1.8.9p5-1ubuntu1.3","1.8.9p5-1ubuntu1.4","1.8.9p5-1ubuntu1.5+esm1","1.8.9p5-1ubuntu1.5+esm2","1.8.9p5-1ubuntu1.5+esm3","1.8.9p5-1ubuntu1.5+esm5","1.8.9p5-1ubuntu1.5+esm6","1.8.9p5-1ubuntu1.5+esm7","1.8.9p5-1ubuntu1.5+esm8"],"ecosystem_specific":{"binaries":[{"binary_name":"sudo","binary_version":"1.8.9p5-1ubuntu1.5+esm8"},{"binary_name":"sudo-ldap","binary_version":"1.8.9p5-1ubuntu1.5+esm8"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23239.json"}},{"package":{"name":"sudo","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/sudo@1.8.16-0ubuntu1.10?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.16-0ubuntu1.10"}]}],"versions":["1.8.12-1ubuntu3","1.8.16-0ubuntu1","1.8.16-0ubuntu1.1","1.8.16-0ubuntu1.2","1.8.16-0ubuntu1.3","1.8.16-0ubuntu1.4","1.8.16-0ubuntu1.5","1.8.16-0ubuntu1.6","1.8.16-0ubuntu1.7","1.8.16-0ubuntu1.8","1.8.16-0ubuntu1.9"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"sudo","binary_version":"1.8.16-0ubuntu1.10"},{"binary_name":"sudo-ldap","binary_version":"1.8.16-0ubuntu1.10"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23239.json"}},{"package":{"name":"sudo","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/sudo@1.8.21p2-3ubuntu1.4?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.21p2-3ubuntu1.4"}]}],"versions":["1.8.20p2-1ubuntu1","1.8.21p2-2ubuntu1","1.8.21p2-3ubuntu1","1.8.21p2-3ubuntu1.1","1.8.21p2-3ubuntu1.2","1.8.21p2-3ubuntu1.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"sudo","binary_version":"1.8.21p2-3ubuntu1.4"},{"binary_name":"sudo-ldap","binary_version":"1.8.21p2-3ubuntu1.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23239.json"}},{"package":{"name":"sudo","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/sudo@1.8.31-1ubuntu1.2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.31-1ubuntu1.2"}]}],"versions":["1.8.27-1ubuntu4","1.8.29-1ubuntu1","1.8.31-1ubuntu1","1.8.31-1ubuntu1.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"sudo","binary_version":"1.8.31-1ubuntu1.2"},{"binary_name":"sudo-ldap","binary_version":"1.8.31-1ubuntu1.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-23239.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"},{"type":"Ubuntu","score":"low"}]}