{"id":"UBUNTU-CVE-2017-15906","details":"The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly prevent write operations in readonly mode, which allows attackers to create zero-length files.","modified":"2026-01-30T02:24:43.039488Z","published":"2017-10-25T00:00:00Z","related":["USN-3538-1"],"upstream":["CVE-2017-15906"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2017-15906"},{"type":"REPORT","url":"https://www.openssh.com/txt/release-7.6"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3538-1"},{"type":"REPORT","url":"https://xorl.wordpress.com/2017/11/13/openssh-sftp-server-remote-security-vulnerability/"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2017-15906"}],"affected":[{"package":{"name":"openssh","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.10?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:6.6p1-2ubuntu2.10"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"openssh-client","binary_version":"1:6.6p1-2ubuntu2.10"},{"binary_name":"openssh-server","binary_version":"1:6.6p1-2ubuntu2.10"},{"binary_name":"openssh-sftp-server","binary_version":"1:6.6p1-2ubuntu2.10"},{"binary_name":"ssh","binary_version":"1:6.6p1-2ubuntu2.10"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:6.6p1-2ubuntu2.10"},{"binary_name":"ssh-krb5","binary_version":"1:6.6p1-2ubuntu2.10"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-15906.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.4?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.2p2-4ubuntu2.4"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"openssh-client","binary_version":"1:7.2p2-4ubuntu2.4"},{"binary_name":"openssh-client-ssh1","binary_version":"1:7.2p2-4ubuntu2.4"},{"binary_name":"openssh-server","binary_version":"1:7.2p2-4ubuntu2.4"},{"binary_name":"openssh-sftp-server","binary_version":"1:7.2p2-4ubuntu2.4"},{"binary_name":"ssh","binary_version":"1:7.2p2-4ubuntu2.4"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:7.2p2-4ubuntu2.4"},{"binary_name":"ssh-krb5","binary_version":"1:7.2p2-4ubuntu2.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-15906.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:7.6p1-4?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.6p1-4"}]}],"versions":["1:7.5p1-10"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"openssh-client","binary_version":"1:7.6p1-4"},{"binary_name":"openssh-server","binary_version":"1:7.6p1-4"},{"binary_name":"openssh-sftp-server","binary_version":"1:7.6p1-4"},{"binary_name":"ssh","binary_version":"1:7.6p1-4"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:7.6p1-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-15906.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"low"}]}