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NEW QUESTION: 1
If an operating system permits shared resources such as memory to be used sequentially by multiple users/application or subjects without a refresh of the objects/memory area, what security problem is MOST likely to exist?
A. Disclosure of residual data.
B. Unauthorized obtaining of a privileged execution state.
C. Data leakage through covert channels.
D. Denial of service through a deadly embrace.
Answer: A
Explanation:
Allowing objects to be used sequentially by multiple users without a refresh of the
objects can lead to disclosure of residual data. It is important that steps be taken to eliminate the
chance for the disclosure of residual data.
Object reuse refers to the allocation or reallocation of system resources to a user or, more
appropriately, to an application or process. Applications and services on a computer system may
create or use objects in memory and in storage to perform programmatic functions. In some
cases, it is necessary to share these resources between various system applications. However,
some objects may be employed by an application to perform privileged tasks on behalf of an
authorized user or upstream application. If object usage is not controlled or the data in those
objects is not erased after use, they may become available to unauthorized users or processes.
Disclosure of residual data and Unauthorized obtaining of a privileged execution state are both a
problem with shared memory and resources. Not clearing the heap/stack can result in residual
data and may also allow the user to step on somebody's session if the security token/identify was
maintained in that space. This is generally more malicious and intentional than accidental though.
The MOST common issue would be Disclosure of residual data.
The following answers are incorrect:
Unauthorized obtaining of a privileged execution state. Is incorrect because this is not a problem
with Object Reuse.
Data leakage through covert channels. Is incorrect because it is not the best answer. A covert
channel is a communication path. Data leakage would not be a problem created by Object Reuse.
In computer security, a covert channel is a type of computer security attack that creates a
capability to transfer information objects between processes that are not supposed to be allowed to communicate by the computer security policy. The term, originated in 1973 by Lampson is defined as "(channels) not intended for information transfer at all, such as the service program's effect on system load." to distinguish it from Legitimate channels that are subjected to access controls by COMPUSEC. Denial of service through a deadly embrace. Is incorrect because it is only a detractor.
References: Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third Edition ((ISC)2 Press) (Kindle Locations 4174-4179). Auerbach Publications. Kindle Edition. and https://www.fas.org/irp/nsa/rainbow/tg018.htm and http://en.wikipedia.org/wiki/Covert_channel
NEW QUESTION: 2
What organization within IBM provides pre-sales Technical Support to both IBM and Business partners areas such as configuration support and technical Q&A.
A. Techline
B. ATS
C. Lab services
D. Compete Center
Answer: A
NEW QUESTION: 3
Which of the following statements about the file system planning of the N8500 clustered NAS storage systems are correct? (Select two)
A. A file system has at most 10 levels of directories.
B. Afile system has at most 10 million files.
C. A file system has at most 10,000 directories.
D. A directory has at most 10,000 files.
Answer: A,D