{"id":"UBUNTU-CVE-2018-20679","details":"An issue was discovered in BusyBox before 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP server, client, and relay) allows a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to verification in udhcp_get_option() in networking/udhcp/common.c that 4-byte options are indeed 4 bytes.","modified":"2026-02-04T03:04:49.185794Z","published":"2019-01-09T00:00:00Z","related":["USN-3935-1"],"upstream":["CVE-2018-20679"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20679"},{"type":"REPORT","url":"https://busybox.net/news.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3935-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-20679"}],"affected":[{"package":{"name":"busybox","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/busybox@1:1.21.0-1ubuntu1.4?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.21.0-1ubuntu1.4"}]}],"versions":["1:1.20.0-8.1ubuntu1","1:1.20.0-9ubuntu1","1:1.20.0-9ubuntu2","1:1.21.0-1ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1:1.21.0-1ubuntu1.4","binary_name":"busybox"},{"binary_version":"1:1.21.0-1ubuntu1.4","binary_name":"busybox-initramfs"},{"binary_version":"1:1.21.0-1ubuntu1.4","binary_name":"busybox-static"},{"binary_version":"1:1.21.0-1ubuntu1.4","binary_name":"busybox-syslogd"},{"binary_version":"1:1.21.0-1ubuntu1.4","binary_name":"udhcpc"},{"binary_version":"1:1.21.0-1ubuntu1.4","binary_name":"udhcpd"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20679.json"}},{"package":{"name":"busybox","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/busybox@1:1.22.0-15ubuntu1.4?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.22.0-15ubuntu1.4"}]}],"versions":["1:1.22.0-15ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1:1.22.0-15ubuntu1.4","binary_name":"busybox"},{"binary_version":"1:1.22.0-15ubuntu1.4","binary_name":"busybox-initramfs"},{"binary_version":"1:1.22.0-15ubuntu1.4","binary_name":"busybox-static"},{"binary_version":"1:1.22.0-15ubuntu1.4","binary_name":"busybox-syslogd"},{"binary_version":"1:1.22.0-15ubuntu1.4","binary_name":"udhcpc"},{"binary_version":"1:1.22.0-15ubuntu1.4","binary_name":"udhcpd"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20679.json"}},{"package":{"name":"busybox","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/busybox@1:1.27.2-2ubuntu3.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.27.2-2ubuntu3.2"}]}],"versions":["1:1.22.0-19ubuntu2","1:1.27.2-1ubuntu3","1:1.27.2-1ubuntu4","1:1.27.2-2ubuntu2","1:1.27.2-2ubuntu3","1:1.27.2-2ubuntu3.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1:1.27.2-2ubuntu3.2","binary_name":"busybox"},{"binary_version":"1:1.27.2-2ubuntu3.2","binary_name":"busybox-initramfs"},{"binary_version":"1:1.27.2-2ubuntu3.2","binary_name":"busybox-static"},{"binary_version":"1:1.27.2-2ubuntu3.2","binary_name":"busybox-syslogd"},{"binary_version":"1:1.27.2-2ubuntu3.2","binary_name":"udhcpc"},{"binary_version":"1:1.27.2-2ubuntu3.2","binary_name":"udhcpd"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20679.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:H/I:N/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"low"}]}