{"id":"UBUNTU-CVE-2018-15599","details":"The recv_msg_userauth_request function in svr-auth.c in Dropbear through 2018.76 is prone to a user enumeration vulnerability because username validity affects how fields in SSH_MSG_USERAUTH messages are handled, a similar issue to CVE-2018-15473 in an unrelated codebase.","modified":"2025-10-24T04:47:10Z","published":"2018-08-21T01:29:00Z","upstream":["CVE-2018-15599"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-15599"},{"type":"REPORT","url":"http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.html"},{"type":"REPORT","url":"http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.html"},{"type":"REPORT","url":"https://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-15599"}],"affected":[{"package":{"name":"dropbear","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/dropbear@2016.72-1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2014.65-1ubuntu2","2015.68-1","2015.70-1","2015.71-1","2016.72-1"],"ecosystem_specific":{"binaries":[{"binary_version":"2016.72-1","binary_name":"dropbear"},{"binary_name":"dropbear-bin","binary_version":"2016.72-1"},{"binary_name":"dropbear-initramfs","binary_version":"2016.72-1"},{"binary_name":"dropbear-run","binary_version":"2016.72-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-15599.json"}},{"package":{"name":"dropbear","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/dropbear@2017.75-3ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2017.75-2","2017.75-3build1","2017.75-3ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"dropbear","binary_version":"2017.75-3ubuntu0.1~esm1"},{"binary_name":"dropbear-bin","binary_version":"2017.75-3ubuntu0.1~esm1"},{"binary_name":"dropbear-initramfs","binary_version":"2017.75-3ubuntu0.1~esm1"},{"binary_name":"dropbear-run","binary_version":"2017.75-3ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-15599.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"type":"Ubuntu","score":"low"}]}