{"id":"UBUNTU-CVE-2021-38185","details":"GNU cpio through 2.13 allows attackers to execute arbitrary code via a crafted pattern file, because of a dstring.c ds_fgetstr integer overflow that triggers an out-of-bounds heap write. NOTE: it is unclear whether there are common cases where the pattern file, associated with the -E option, is untrusted data.","modified":"2026-02-04T04:31:08.546880Z","published":"2021-08-08T00:15:00Z","related":["USN-5064-1","USN-5064-2","USN-5064-3"],"upstream":["CVE-2021-38185"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-38185"},{"type":"REPORT","url":"https://github.com/fangqyi/cpiopwn"},{"type":"REPORT","url":"https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00000.html"},{"type":"REPORT","url":"https://lists.gnu.org/archive/html/bug-cpio/2021-08/msg00002.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5064-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5064-2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5064-3"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-38185"}],"affected":[{"package":{"name":"cpio","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/cpio@2.11+dfsg-1ubuntu1.2+esm2?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.11+dfsg-1ubuntu1.2+esm2"}]}],"versions":["2.11+dfsg-1ubuntu1","2.11+dfsg-1ubuntu1.1","2.11+dfsg-1ubuntu1.2","2.11+dfsg-1ubuntu1.2+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"cpio","binary_version":"2.11+dfsg-1ubuntu1.2+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-38185.json"}},{"package":{"name":"cpio","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/cpio@2.11+dfsg-5ubuntu1.1+esm1?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.11+dfsg-5ubuntu1.1+esm1"}]}],"versions":["2.11+dfsg-4.1ubuntu1","2.11+dfsg-5ubuntu1","2.11+dfsg-5ubuntu1.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"cpio","binary_version":"2.11+dfsg-5ubuntu1.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-38185.json"}},{"package":{"name":"cpio","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/cpio@2.12+dfsg-6ubuntu0.18.04.4?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.12+dfsg-6ubuntu0.18.04.4"}]}],"versions":["2.11+dfsg-6","2.12+dfsg-6","2.12+dfsg-6ubuntu0.18.04.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"2.12+dfsg-6ubuntu0.18.04.4","binary_name":"cpio"},{"binary_version":"2.12+dfsg-6ubuntu0.18.04.4","binary_name":"cpio-win32"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-38185.json"}},{"package":{"name":"cpio","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/cpio@2.13+dfsg-2ubuntu0.3?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.13+dfsg-2ubuntu0.3"}]}],"versions":["2.12+dfsg-9","2.12+dfsg-9ubuntu1","2.13+dfsg-1","2.13+dfsg-2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"cpio","binary_version":"2.13+dfsg-2ubuntu0.3"},{"binary_name":"cpio-win32","binary_version":"2.13+dfsg-2ubuntu0.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-38185.json"}},{"package":{"name":"cpio","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/cpio@2.13+dfsg-4ubuntu4?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.13+dfsg-4ubuntu4"}]}],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"cpio","binary_version":"2.13+dfsg-4ubuntu4"},{"binary_name":"cpio-win32","binary_version":"2.13+dfsg-4ubuntu4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-38185.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}