{"id":"UBUNTU-CVE-2024-3094","details":"Malicious code was discovered in the upstream tarballs of xz, starting with version 5.6.0. Through a series of complex obfuscations, the liblzma build process extracts a prebuilt object file from a disguised test file existing in the source code, which is then used to modify specific functions in the liblzma code. This results in a modified liblzma library that can be used by any software linked against this library, intercepting and modifying the data interaction with this library.","modified":"2025-07-16T07:47:12.020393Z","published":"2024-03-29T17:15:00Z","withdrawn":"2025-07-18T16:56:17Z","upstream":["CVE-2024-3094"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2024-3094"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2024/03/29/4"},{"type":"REPORT","url":"https://discourse.ubuntu.com/t/xz-liblzma-security-update/43714"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2024-3094"}],"affected":[{"package":{"name":"xz-utils","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/xz-utils@5.2.4-1ubuntu1.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.2.4-1ubuntu1.1"}]}],"versions":["5.2.4-1","5.2.4-1ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"liblzma-dev","binary_version":"5.2.4-1ubuntu1.1"},{"binary_name":"liblzma-doc","binary_version":"5.2.4-1ubuntu1.1"},{"binary_name":"liblzma5","binary_version":"5.2.4-1ubuntu1.1"},{"binary_name":"liblzma5-dbgsym","binary_version":"5.2.4-1ubuntu1.1"},{"binary_name":"xz-utils","binary_version":"5.2.4-1ubuntu1.1"},{"binary_name":"xz-utils-dbgsym","binary_version":"5.2.4-1ubuntu1.1"},{"binary_name":"xzdec","binary_version":"5.2.4-1ubuntu1.1"},{"binary_name":"xzdec-dbgsym","binary_version":"5.2.4-1ubuntu1.1"}],"priority_reason":"Results in a backdoor in sshd"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-3094.json"}},{"package":{"name":"xz-utils","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/xz-utils@5.2.5-2ubuntu1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.2.5-2ubuntu1"}]}],"versions":["5.2.5-2","5.2.5-2build1","5.2.5-2build2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"liblzma-dev","binary_version":"5.2.5-2ubuntu1"},{"binary_name":"liblzma-doc","binary_version":"5.2.5-2ubuntu1"},{"binary_version":"5.2.5-2ubuntu1","binary_name":"liblzma5"},{"binary_name":"liblzma5-dbgsym","binary_version":"5.2.5-2ubuntu1"},{"binary_name":"xz-utils","binary_version":"5.2.5-2ubuntu1"},{"binary_name":"xz-utils-dbgsym","binary_version":"5.2.5-2ubuntu1"},{"binary_name":"xzdec","binary_version":"5.2.5-2ubuntu1"},{"binary_name":"xzdec-dbgsym","binary_version":"5.2.5-2ubuntu1"}],"priority_reason":"Results in a backdoor in sshd"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-3094.json"}},{"package":{"name":"xz-utils","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/xz-utils@5.4.5-0.3?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.5-0.3"}]}],"versions":["5.4.1-0.2","5.4.4-0.1","5.4.5-0.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"liblzma-dev","binary_version":"5.4.5-0.3"},{"binary_name":"liblzma-doc","binary_version":"5.4.5-0.3"},{"binary_name":"liblzma5","binary_version":"5.4.5-0.3"},{"binary_name":"liblzma5-dbgsym","binary_version":"5.4.5-0.3"},{"binary_version":"5.4.5-0.3","binary_name":"xz-utils"},{"binary_name":"xz-utils-dbgsym","binary_version":"5.4.5-0.3"},{"binary_version":"5.4.5-0.3","binary_name":"xzdec"},{"binary_name":"xzdec-dbgsym","binary_version":"5.4.5-0.3"}],"priority_reason":"Results in a backdoor in sshd"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-3094.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},{"type":"Ubuntu","score":"critical"}]}