The checkrpcsecauth function in kadmin/server/kadmrpcsvc.c in kadmind in MIT Kerberos 5 (aka krb5) through 1.11.5, 1.12.x through 1.12.2, and 1.13.x before 1.13.1 allows remote authenticated users to bypass a kadmin/* authorization check and obtain administrative access by leveraging access to a two-component principal with an initial "kadmind" substring, as demonstrated by a "ka/x" principal.
{
"availability": "No subscription required",
"binaries": [
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "krb5-admin-server"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "krb5-gss-samples"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "krb5-kdc"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "krb5-kdc-ldap"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "krb5-locales"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "krb5-multidev"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "krb5-otp"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "krb5-pkinit"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "krb5-user"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libgssapi-krb5-2"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libgssrpc4"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libk5crypto3"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libkadm5clnt-mit9"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libkadm5srv-mit8"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libkadm5srv-mit9"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libkdb5-7"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libkrad-dev"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libkrad0"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libkrb5-3"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libkrb5-dev"
},
{
"binary_version": "1.12+dfsg-2ubuntu5.1",
"binary_name": "libkrb5support0"
}
]
}