IT Baseline Protection Manual - The Information Warfare Site

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Threats Catalogue Deliberate Acts Remarks ____________________________________________________________________ ......................................... T 3.9 Improper IT system administration Improper IT system administration can jeopardises the security of the system if it results in circumvention of or failure to observe IT security measures. Improper administration exists, for example, if network access points (daemon processes) which are not necessary for the regular operation of the IT system or which represent a particularly large threat due to their error-proneness are created or not disabled. Under no circumstances should access accounts be used when working on the system which possess more privileges than are absolutely necessary for the work, as this raises the danger of loss or damage due to viruses and Trojan horses unnecessarily. It is extremely rare that standard installations of operating systems or system programs have all the features of a secure installation. Inappropriate modifications to specific security requirements can pose a considerable risk here. Special care must be taken with systems which, if poorly administrated, could affect the protection of other systems (e.g. firewalls). Every modification of security settings and extension of access rights constitutes a potential threat to overall security. Examples In addition to the instances mentioned under T 3.8 Improper use of the IT system, the System Administrator may create threats due to the incorrect installation of new or existing software. Other instances of incorrect management are: failure to use auditing functions or to analyse existing log files, granting of overgenerous access rights, failure to review access rights at regular intervals, multiple assignment of the same log-in name or UID, and failure to use the available security tools, e.g. failure to use a shadow file for passwords under UNIX. The older a password is, the less effective it becomes. The reason for this is that the probability of a successful attack increases steadily over time. Special care must be taken over the administration of a firewall system as the protection of many other systems depends on it. ____________________________________________________________________ ......................................... IT-Baseline Protection Manual: Oktober 2000 Insecure network access Unnecessary access rights Improper modifications Inadequate logging Ageing of passwords
Threats Catalogue Deliberate Acts Remarks ____________________________________________________________________ ......................................... T 3.10 Incorrect export of file systems under UNIX Exported disks can be mounted from any computer whose name is specified in files /etc/exports or /etc/dfs/dfstab. The user of such a computer can assume any UID and GID. As long as directories have not been exported with the option root=, UID 0 (root) constitutes an exception which, on access to an NFS server, is normally mapped to a different UID (e.g. to the UID of the user nobody or anonymous). Hence only files which belong to root can be protected. There are no adequate protective measures available in protected environments for the use of the NFS protocols for the export of file systems or the distribution of system files using NIS. Such use therefore constitutes a threat to the integrity of the systems. ____________________________________________________________________ ......................................... IT-Baseline Protection Manual: Oktober 2000
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