{"id":"UBUNTU-CVE-2018-15919","details":"Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. NOTE: the discoverer states 'We understand that the OpenSSH developers do not want to treat such a username enumeration (or \"oracle\") as a vulnerability.'","modified":"2026-03-13T17:52:25.175969Z","published":"2018-08-28T08:29:00Z","upstream":["CVE-2018-15919"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-15919"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2018/08/27/2"},{"type":"REPORT","url":"http://seclists.org/oss-sec/2018/q3/180"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-15919"}],"affected":[{"package":{"name":"openssh","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.13+esm2?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:6.2p2-6","1:6.2p2-6ubuntu1","1:6.4p1-1","1:6.4p1-2","1:6.5p1-1","1:6.5p1-2","1:6.5p1-3","1:6.5p1-4","1:6.5p1-6","1:6.6p1-1","1:6.6p1-2","1:6.6p1-2ubuntu1","1:6.6p1-2ubuntu2","1:6.6p1-2ubuntu2.2","1:6.6p1-2ubuntu2.3","1:6.6p1-2ubuntu2.4","1:6.6p1-2ubuntu2.6","1:6.6p1-2ubuntu2.7","1:6.6p1-2ubuntu2.8","1:6.6p1-2ubuntu2.10","1:6.6p1-2ubuntu2.11","1:6.6p1-2ubuntu2.12","1:6.6p1-2ubuntu2.13","1:6.6p1-2ubuntu2.13+esm1","1:6.6p1-2ubuntu2.13+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1:6.6p1-2ubuntu2.13+esm2","binary_name":"openssh-client"},{"binary_version":"1:6.6p1-2ubuntu2.13+esm2","binary_name":"openssh-server"},{"binary_version":"1:6.6p1-2ubuntu2.13+esm2","binary_name":"openssh-sftp-server"},{"binary_version":"1:6.6p1-2ubuntu2.13+esm2","binary_name":"ssh"},{"binary_version":"1:6.6p1-2ubuntu2.13+esm2","binary_name":"ssh-askpass-gnome"},{"binary_version":"1:6.6p1-2ubuntu2.13+esm2","binary_name":"ssh-krb5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-15919.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.10+esm7?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:6.9p1-2","1:6.9p1-3","1:7.1p1-1","1:7.1p1-3","1:7.1p1-4","1:7.1p1-6","1:7.1p2-1","1:7.1p2-2","1:7.2p1-1","1:7.2p2-1","1:7.2p2-2","1:7.2p2-3","1:7.2p2-4","1:7.2p2-4ubuntu1","1:7.2p2-4ubuntu2.1","1:7.2p2-4ubuntu2.2","1:7.2p2-4ubuntu2.4","1:7.2p2-4ubuntu2.5","1:7.2p2-4ubuntu2.6","1:7.2p2-4ubuntu2.7","1:7.2p2-4ubuntu2.8","1:7.2p2-4ubuntu2.10","1:7.2p2-4ubuntu2.10+esm1","1:7.2p2-4ubuntu2.10+esm2","1:7.2p2-4ubuntu2.10+esm3","1:7.2p2-4ubuntu2.10+esm4","1:7.2p2-4ubuntu2.10+esm5","1:7.2p2-4ubuntu2.10+esm6","1:7.2p2-4ubuntu2.10+esm7"],"ecosystem_specific":{"binaries":[{"binary_version":"1:7.2p2-4ubuntu2.10+esm7","binary_name":"openssh-client"},{"binary_version":"1:7.2p2-4ubuntu2.10+esm7","binary_name":"openssh-client-ssh1"},{"binary_version":"1:7.2p2-4ubuntu2.10+esm7","binary_name":"openssh-server"},{"binary_version":"1:7.2p2-4ubuntu2.10+esm7","binary_name":"openssh-sftp-server"},{"binary_version":"1:7.2p2-4ubuntu2.10+esm7","binary_name":"ssh"},{"binary_version":"1:7.2p2-4ubuntu2.10+esm7","binary_name":"ssh-askpass-gnome"},{"binary_version":"1:7.2p2-4ubuntu2.10+esm7","binary_name":"ssh-krb5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-15919.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:7.6p1-4ubuntu0.7+esm4?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:7.5p1-10","1:7.6p1-4","1:7.6p1-4ubuntu0.1","1:7.6p1-4ubuntu0.2","1:7.6p1-4ubuntu0.3","1:7.6p1-4ubuntu0.5","1:7.6p1-4ubuntu0.6","1:7.6p1-4ubuntu0.7","1:7.6p1-4ubuntu0.7+esm1","1:7.6p1-4ubuntu0.7+esm2","1:7.6p1-4ubuntu0.7+esm3","1:7.6p1-4ubuntu0.7+esm4"],"ecosystem_specific":{"binaries":[{"binary_version":"1:7.6p1-4ubuntu0.7+esm4","binary_name":"openssh-client"},{"binary_version":"1:7.6p1-4ubuntu0.7+esm4","binary_name":"openssh-server"},{"binary_version":"1:7.6p1-4ubuntu0.7+esm4","binary_name":"openssh-sftp-server"},{"binary_version":"1:7.6p1-4ubuntu0.7+esm4","binary_name":"ssh"},{"binary_version":"1:7.6p1-4ubuntu0.7+esm4","binary_name":"ssh-askpass-gnome"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-15919.json"}},{"package":{"name":"openssh-ssh1","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-10?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:7.5p1-8","1:7.5p1-9","1:7.5p1-9build1","1:7.5p1-10"],"ecosystem_specific":{"binaries":[{"binary_version":"1:7.5p1-10","binary_name":"openssh-client-ssh1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-15919.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:8.2p1-4ubuntu0.13+esm1?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versio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