{"id":"UBUNTU-CVE-2015-2694","details":"The kdcpreauth modules in MIT Kerberos 5 (aka krb5) 1.12.x and 1.13.x before 1.13.2 do not properly track whether a client's request has been validated, which allows remote attackers to bypass an intended preauthentication requirement by providing (1) zero bytes of data or (2) an arbitrary realm name, related to plugins/preauth/otp/main.c and plugins/preauth/pkinit/pkinit_srv.c.","modified":"2026-04-22T10:05:23.704464Z","published":"2015-05-25T00:00:00Z","related":["USN-2810-1"],"upstream":["CVE-2015-2694"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-2694"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-2810-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2015-2694"}],"affected":[{"package":{"name":"krb5","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/krb5@1.12+dfsg-2ubuntu5.2?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12+dfsg-2ubuntu5.2"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"krb5-admin-server","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"krb5-gss-samples","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"krb5-kdc","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"krb5-kdc-ldap","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"krb5-locales","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"krb5-multidev","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"krb5-otp","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"krb5-pkinit","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"krb5-user","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"libgssapi-krb5-2","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"libgssrpc4","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"libk5crypto3","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"libkadm5clnt-mit9","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"libkadm5srv-mit8","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"libkadm5srv-mit9","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"libkdb5-7","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"libkrad0","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"libkrb5-3","binary_version":"1.12+dfsg-2ubuntu5.2"},{"binary_name":"libkrb5support0","binary_version":"1.12+dfsg-2ubuntu5.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2015/UBUNTU-CVE-2015-2694.json"}}],"schema_version":"1.7.5","severity":[{"type":"Ubuntu","score":"medium"}]}