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NEW QUESTION: 1
What would you call an attack where an attacker can influence the state of the resource between check and use?
This attack can happen with shared resources such as files, memory, or even variables in multithreaded programs. This can cause the software to perform invalid actions when the resource is in an unexpected state. The steps followed by this attack are usually the following: the software checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.
A. Time of Use attack
B. Input checking attack
C. Time of Check attack
D. TOCTOU attack
Answer: D
Explanation:
The TOCTTOU acronym expands to "Time Of Check To Time Of Use". It is a type of File Access Race Condition.
The software checks the state of a resource before using that resource, but the resource's state
can change between the check and the use in a way that invalidates the results of the check. This
can cause the software to perform invalid actions when the resource is in an unexpected state.
This weakness can be security-relevant when an attacker can influence the state of the resource
between check and use. This can happen with shared resources such as files, memory, or even
variables in multithreaded programs.
See the reference below for more details and examples of how this attack could be carried out.
WHAT ARE RACE CONDITIONS:
A race condition or race hazard is the behavior of an electronic or software system where the
output is dependent on the sequence or timing of other uncontrollable events. It becomes a bug
when events do not happen in the order the programmer intended. The term originates with the
idea of two signals racing each other to influence the output first.
Race conditions can occur in electronics systems, especially logic circuits, and in computer
software, especially multithreaded or distributed programs.
Race conditions arise in software when an application depends on the sequence or timing of
processes or threads for it to operate properly. As with electronics, there are critical race
conditions that result in invalid execution and bugs as well as non-critical race-conditions that
result in unanticipated behavior. Critical race conditions often happen when the processes or
threads depend on some shared state. Operations upon shared states are critical sections that
must be mutually exclusive. Failure to obey this rule opens up the possibility of corrupting the
shared state.
Race conditions have a reputation of being difficult to reproduce and debug, since the end result is
nondeterministic and depends on the relative timing between interfering threads. Problems
occurring in production systems can therefore disappear when running in debug mode, when
additional logging is added, or when attaching a debugger, often referred to as a "Heisenbug". It is
therefore better to avoid race conditions by careful software design rather than attempting to fix
them afterwards.
The following answers are incorrect:
All of the other choices are incorrect and only bogus detractors
The following reference(s) were/was used to create this question:
http://cwe.mitre.org/data/definitions/367.html
and
https://www.owasp.org/index.php/File_Access_Race_Condition:_TOCTOU
and
http://en.wikipedia.org/wiki/Race_condition

NEW QUESTION: 2
Lisa, eine Administratorin, hat ein drahtloses 802.11n-Netzwerk eingerichtet. Benutzer mit 802.11n-Laptops haben berichtet, dass die Geschwindigkeit langsam ist. Nach dem Testen stellt Lisa fest, dass Benutzer maximal 802.11g-Geschwindigkeiten erreichen. Welche der folgenden Möglichkeiten würde MOST dieses Problem wahrscheinlich beheben?
A. Beschränken Sie die Clients auf 802.11g-kompatible Laptops
B. Verwenden Sie die 40-MHz-Kanäle im 2,4-GHz-Band
C. Aktivieren Sie die Isolation der Access Point-Antenne
D. Aktivieren Sie Wireless Multimedia (WMM) für QoS
Answer: D

NEW QUESTION: 3
Ein IS-Audit zeigt, dass die IT-Abteilung eines Unternehmens Abweichungen von seinen Sicherheitsstandards an ein internes IT-Risiko-Komitee meldet, an dem das IT-Management beteiligt ist. Welche der folgenden Fragen sollte das größte Anliegen des IS-Auditors sein?
A. Die Liste der Mitglieder des IT-Risikoausschusses enthält nicht das für die IT zuständige Vorstandsmitglied.
B. Das Sitzungsprotokoll des IT-Risikoausschusses wird nicht von allen Teilnehmern unterzeichnet.
C. Der Chief Information Officer (CIO) hat im vergangenen Jahr nicht an mehreren Sitzungen des IT-Risikoausschusses teilgenommen.
D. Das IT-Risiko-Komitee hat keine Berichtslinie zu einem Governance-Komitee außerhalb der IT.
Answer: D