{"id":"UBUNTU-CVE-2018-20685","details":"In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.","modified":"2026-01-30T00:50:25.511238Z","published":"2019-01-10T00:00:00Z","related":["USN-3885-1"],"upstream":["CVE-2018-20685"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20685"},{"type":"REPORT","url":"https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt"},{"type":"REPORT","url":"https://lists.mindrot.org/pipermail/openssh-unix-dev/2019-January/037459.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3885-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-20685"}],"affected":[{"package":{"name":"openssh","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.12?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:6.6p1-2ubuntu2.12"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client","binary_version":"1:6.6p1-2ubuntu2.12"},{"binary_name":"openssh-server","binary_version":"1:6.6p1-2ubuntu2.12"},{"binary_name":"openssh-sftp-server","binary_version":"1:6.6p1-2ubuntu2.12"},{"binary_name":"ssh","binary_version":"1:6.6p1-2ubuntu2.12"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:6.6p1-2ubuntu2.12"},{"binary_name":"ssh-krb5","binary_version":"1:6.6p1-2ubuntu2.12"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20685.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.7?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.2p2-4ubuntu2.7"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client","binary_version":"1:7.2p2-4ubuntu2.7"},{"binary_name":"openssh-client-ssh1","binary_version":"1:7.2p2-4ubuntu2.7"},{"binary_name":"openssh-server","binary_version":"1:7.2p2-4ubuntu2.7"},{"binary_name":"openssh-sftp-server","binary_version":"1:7.2p2-4ubuntu2.7"},{"binary_name":"ssh","binary_version":"1:7.2p2-4ubuntu2.7"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:7.2p2-4ubuntu2.7"},{"binary_name":"ssh-krb5","binary_version":"1:7.2p2-4ubuntu2.7"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20685.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:Pro:FIPS:16.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.fips.2.8.1?arch=source&distro=fips-updates/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.2p2-4ubuntu2.fips.2.8.1"}]}],"versions":["1:7.2p2-4ubuntu2.fips.2.2.3","1:7.2p2-4ubuntu2.fips.2.4.1","1:7.2p2-4ubuntu2.fips.2.4.2"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client","binary_version":"1:7.2p2-4ubuntu2.fips.2.8.1"},{"binary_name":"openssh-client-hmac","binary_version":"1:7.2p2-4ubuntu2.fips.2.8.1"},{"binary_name":"openssh-client-ssh1","binary_version":"1:7.2p2-4ubuntu2.fips.2.8.1"},{"binary_name":"openssh-server","binary_version":"1:7.2p2-4ubuntu2.fips.2.8.1"},{"binary_name":"openssh-server-hmac","binary_version":"1:7.2p2-4ubuntu2.fips.2.8.1"},{"binary_name":"openssh-sftp-server","binary_version":"1:7.2p2-4ubuntu2.fips.2.8.1"},{"binary_name":"ssh","binary_version":"1:7.2p2-4ubuntu2.fips.2.8.1"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:7.2p2-4ubuntu2.fips.2.8.1"},{"binary_name":"ssh-krb5","binary_version":"1:7.2p2-4ubuntu2.fips.2.8.1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20685.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:Pro:FIPS:16.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.fips.2.10.1?arch=source&distro=fips/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.2p2-4ubuntu2.fips.2.10.1"}]}],"versions":["1:7.2p2-4ubuntu2.fips.2.2","1:7.2p2-4ubuntu2.fips.2.2.1"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.1"},{"binary_name":"openssh-client-hmac","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.1"},{"binary_name":"openssh-client-ssh1","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.1"},{"binary_name":"openssh-server","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.1"},{"binary_name":"openssh-server-hmac","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.1"},{"binary_name":"openssh-sftp-server","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.1"},{"binary_name":"ssh","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.1"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.1"},{"binary_name":"ssh-krb5","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20685.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:7.6p1-4ubuntu0.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.6p1-4ubuntu0.2"}]}],"versions":["1:7.5p1-10","1:7.6p1-4","1:7.6p1-4ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client","binary_version":"1:7.6p1-4ubuntu0.2"},{"binary_name":"openssh-server","binary_version":"1:7.6p1-4ubuntu0.2"},{"binary_name":"openssh-sftp-server","binary_version":"1:7.6p1-4ubuntu0.2"},{"binary_name":"ssh","binary_version":"1:7.6p1-4ubuntu0.2"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:7.6p1-4ubuntu0.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20685.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_name":"openssh-client-ssh1","binary_version":"1:7.5p1-10"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20685.json"}},{"package":{"name":"openssh-ssh1","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-11build1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:7.5p1-11build1"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client-ssh1","binary_version":"1:7.5p1-11build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20685.json"}},{"package":{"name":"openssh-ssh1","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-13?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:7.5p1-12","1:7.5p1-12build1","1:7.5p1-13"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client-ssh1","binary_version":"1:7.5p1-13"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20685.json"}},{"package":{"name":"openssh-ssh1","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-16?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:7.5p1-14","1:7.5p1-15","1:7.5p1-15build1","1:7.5p1-16"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client-ssh1","binary_version":"1:7.5p1-16"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20685.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}