{"id":"USN-7542-1","summary":"krb5 vulnerability","details":"It was discovered that Kerberos allowed the usage of weak cryptographic\nstandards. An attacker could possibly use this issue to expose sensitive\ninformation.\n\nThis update introduces the allow_rc4 and allow_des3 configuration options,\nand disables the usage of RC4 and 3DES ciphers by default. Users are\nadvised to discontinue their usage and upgrade to stronger encryption\nprotocols. If the use of the insecure RC4 and 3DES algorithms is necessary,\nthey can be enabled with the aforementioned configuration options.","modified":"2026-02-10T04:48:59Z","published":"2025-05-28T14:41:26Z","related":["UBUNTU-CVE-2025-3576"],"upstream":["CVE-2025-3576","UBUNTU-CVE-2025-3576"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7542-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-3576"}],"affected":[{"package":{"name":"krb5","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/krb5@1.12+dfsg-2ubuntu5.4+esm7?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12+dfsg-2ubuntu5.4+esm7"}]}],"versions":["1.10.1+dfsg-6.1ubuntu1","1.11.3+dfsg-3ubuntu2","1.12+dfsg-2ubuntu1","1.12+dfsg-2ubuntu2","1.12+dfsg-2ubuntu3","1.12+dfsg-2ubuntu4","1.12+dfsg-2ubuntu4.2","1.12+dfsg-2ubuntu5","1.12+dfsg-2ubuntu5.1","1.12+dfsg-2ubuntu5.2","1.12+dfsg-2ubuntu5.3","1.12+dfsg-2ubuntu5.4","1.12+dfsg-2ubuntu5.4+esm1","1.12+dfsg-2ubuntu5.4+esm2","1.12+dfsg-2ubuntu5.4+esm3","1.12+dfsg-2ubuntu5.4+esm4","1.12+dfsg-2ubuntu5.4+esm5","1.12+dfsg-2ubuntu5.4+esm6"],"ecosystem_specific":{"binaries":[{"binary_name":"krb5-admin-server","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"krb5-gss-samples","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"krb5-kdc","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"krb5-kdc-ldap","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"krb5-locales","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"krb5-multidev","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"krb5-otp","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"krb5-pkinit","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"krb5-user","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libgssapi-krb5-2","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libgssrpc4","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libk5crypto3","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkadm5clnt-mit9","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkadm5srv-mit8","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkadm5srv-mit9","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkdb5-7","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkrad-dev","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkrad0","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkrb5-3","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkrb5-dev","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"},{"binary_name":"libkrb5support0","binary_version":"1.12+dfsg-2ubuntu5.4+esm7"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-3576","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:14.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7542-1.json"}},{"package":{"name":"krb5","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/krb5@1.13.2+dfsg-5ubuntu2.2+esm7?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.2+dfsg-5ubuntu2.2+esm7"}]}],"versions":["1.13.2+dfsg-2","1.13.2+dfsg-3","1.13.2+dfsg-4","1.13.2+dfsg-5","1.13.2+dfsg-5ubuntu1","1.13.2+dfsg-5ubuntu2","1.13.2+dfsg-5ubuntu2.1","1.13.2+dfsg-5ubuntu2.1+esm1","1.13.2+dfsg-5ubuntu2.2","1.13.2+dfsg-5ubuntu2.2+esm3","1.13.2+dfsg-5ubuntu2.2+esm4","1.13.2+dfsg-5ubuntu2.2+esm5","1.13.2+dfsg-5ubuntu2.2+esm6"],"ecosystem_specific":{"binaries":[{"binary_name":"krb5-admin-server","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-gss-samples","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-k5tls","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-kdc","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-kdc-ldap","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-locales","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-multidev","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-otp","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-pkinit","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"krb5-user","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libgssapi-krb5-2","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libgssrpc4","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libk5crypto3","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkadm5clnt-mit9","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkadm5srv-mit9","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkdb5-8","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkrad-dev","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkrad0","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkrb5-3","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkrb5-dev","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"},{"binary_name":"libkrb5support0","binary_version":"1.13.2+dfsg-5ubuntu2.2+esm7"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-3576","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7542-1.json"}},{"package":{"name":"krb5","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/krb5@1.16-2ubuntu0.4+esm5?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.16-2ubuntu0.4+esm5"}]}],"versions":["1.15.1-2","1.16-2","1.16-2build1","1.16-2ubuntu0.1","1.16-2ubuntu0.1+esm1","1.16-2ubuntu0.2","1.16-2ubuntu0.3","1.16-2ubuntu0.4","1.16-2ubuntu0.4+esm1","1.16-2ubuntu0.4+esm2","1.16-2ubuntu0.4+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"krb5-admin-server","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"krb5-gss-samples","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"krb5-k5tls","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"krb5-kdc","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"krb5-kdc-ldap","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"krb5-kpropd","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"krb5-locales","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"krb5-multidev","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"krb5-otp","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"krb5-pkinit","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"krb5-user","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libgssapi-krb5-2","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libgssrpc4","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libk5crypto3","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libkadm5clnt-mit11","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libkadm5srv-mit11","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libkdb5-9","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libkrad-dev","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libkrad0","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libkrb5-3","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libkrb5-dev","binary_version":"1.16-2ubuntu0.4+esm5"},{"binary_name":"libkrb5support0","binary_version":"1.16-2ubuntu0.4+esm5"}],"availability":"Available with Ubuntu Pro (Infra-only): 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