Code: setup_server_realm(krb5_principal sprinc)
{
    krb5_error_code     kret;
     kdc_realm_t         *newrealm;
 
     kret = 0;
     if (kdc_numrealms > 1) {
         if (!(newrealm = find_realm_data(sprinc->realm.data,
                                          (krb5_ui_4) sprinc->realm.length)))
            kret = ENOENT;
        else
            kdc_active_realm = newrealm;
    }
    else
        kdc_active_realm = kdc_realmlist[0];
    return(kret);
}

Vulnerability Type: DoS 
CWE ID: 
Summary: An unspecified third-party database module for the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.10.x allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted request, a different vulnerability than CVE-2013-1418.
Commit Message: Multi-realm KDC null deref [CVE-2013-1418]

If a KDC serves multiple realms, certain requests can cause
setup_server_realm() to dereference a null pointer, crashing the KDC.

CVSSv2: AV:N/AC:M/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C

A related but more minor vulnerability requires authentication to
exploit, and is only present if a third-party KDC database module can
dereference a null pointer under certain conditions.

(back ported from commit 5d2d9a1abe46a2c1a8614d4672d08d9d30a5f8bf)

ticket: 7757 (new)
version_fixed: 1.10.7
status: resolved