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NEW QUESTION: 1

A. Option C
B. Option B
C. Option A
D. Option D
Answer: C

NEW QUESTION: 2
Given the code fragment:

What change should you make to apply good coding practices to this fragment?
A. Rethrow SQLException.
B. Add nested try-with-resources statements for the statement and Resulset declarations.
C. Add the statement and Resulset declarations to the cry-with-resources statement.
D. Add a finally clause after the catch clause.
Answer: D
Explanation:
The finally block always executes when the try block exits. This ensures that the finally block is executed even if an unexpected exception occurs. But finally is useful for more than just exception handling - it allows the programmer to avoid having cleanup code accidentally bypassed by a return, continue, or break. Putting cleanup code in a finally block is always a good practice, even when no exceptions are anticipated.

NEW QUESTION: 3
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. Data leakage through covert channels.
B. Unauthorized obtaining of a privileged execution state.
C. Disclosure of residual data.
D. Denial of service through a deadly embrace.
Answer: C
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