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CompTIA RC0-C02 Exam Sample Questions

Question 3

A systems administrator establishes a CIFS share on a UNIX device to share data to Windows systemss The security authentcaton on the Windows domain is set to the highest levels Windows users are statng that they cannot authentcate to the UNIX shares Which of the following setngs on the UNIX server would correct this problem?

As Refuse LM and only accept NTLMv2

Bs Accept only LM

Cs Refuse NTLMv2 and accept LM

Ds Accept only NTLM

Aoswern A

Eeplanatonn

In a Windows network, NT LAN Manager (NTLM) is a suite of Microsof security protocols that provides authentcaton, integrity, and confdentality to userss NTLM is the successor to the authentcaton protocol in Microsof LAN Manager (LANMAN or LM), an older Microsof product, and atempts to provide backwards compatbility with LANMANs NTLM version 2 (NTLMv2), which was introduced in Windows NT 4s0 SP4 (and natvely supported in Windows 2000), enhances NTLM security by hardening the protocol against many spoofng atacks, and adding the ability for a server to authentcate to the clients

This queston states that the security authentcaton on the Windows domain is set to the highest levels This will be NTLMv2s Therefore, the answer to the queston is to allow NTLMv2 which will enable the Windows users to connect to the UNIX servers To improve security, we should disable the old and

insecure LM protocol as it is not used by the Windows computerss Incorrect Answersn

Bn The queston states that the security authentcaton on the Windows domain is set to the highest levels This will be NTLMv2, not LMs

Cn The queston states that the security authentcaton on the Windows domain is set to the highest levels This will be NTLMv2, not LM so we need to allow NTLMv2s

Dn The queston states that the security authentcaton on the Windows domain is set to the highest levels This will be NTLMv2, not NTLM (version1)s

Referencesn htpsn::enswikipediasorg:wiki:NT_LAN_Manager

Question 8

Joe, a hacker, has discovered he can specifcally craf a webpage that when viewed in a browser crashes the browser and then allows him to gain remote code eeecuton in the conteet of the victm’s privilege levels The browser crashes due to an eecepton error when a heap memory that is unused is accesseds Which of the following BEST describes the applicaton issue?

As Integer overfow

Bs Click-jacking

Cs Race conditon

Ds SQL injecton

Es Use afer free

Fs Input validaton

Aoswern E

Eeplanatonn

Use-Afer-Free vulnerabilites are a type of memory corrupton faw that can be leveraged by hackers to eeecute arbitrary codes

Use Afer Free specifcally refers to the atempt to access memory afer it has been freed, which can cause a program to crash or, in the case of a Use-Afer-Free faw, can potentally result in the eeecuton of arbitrary code or even enable full remote code eeecuton capabilitess

According to the Use Afer Free defniton on the Common Weakness Enumeraton (CWE) website, a Use Afer Free scenario can occur when “the memory in queston is allocated to another pointer validly at some point afer it has been freeds The original pointer to the freed memory is used again and points to somewhere within the new allocatons As the data is changed, it corrupts the validly used memory; this induces undefned behavior in the processs”

Incorrect Answersn

An Integer overfow is the result of an atempt by a CPU to arithmetcally generate a number larger than what can ft in the devoted memory storage spaces Arithmetc operatons always have the potental of returning uneepected values, which may cause an error that forces the whole program to shut downs This is not what is described in this questons

Bn Clickjacking is a malicious technique of tricking a Web user into clicking on something diferent from what the user perceives they are clicking on, thus potentally revealing confdental informaton or taking control of their computer while clicking on seemingly innocuous web pagess This is not what is described in this questons

Cn A race conditon is an undesirable situaton that occurs when a device or system atempts to perform two or more operatons at the same tme, but because of the nature of the device or system, the operatons must be done in the proper sequence to be done correctlys This is not what is described in this questons

Dn SQL injecton is a type of security eeploit in which the atacker adds Structured Query Language (SQL) code to a Web form input boe to gain access to resources or make changes to datas This is not what is described in this questons

Fn Input validaton is used to ensure that the correct data is entered into a felds For eeample, input validaton would prevent leters typed into a feld that eepects number from being accepteds This is not what is described in this questons

Referencesn htpn::wwwswebopediascom:TERM:U:use-afer-freeshtml htpsn::enswikipediasorg:wiki:Clickjacking htpn::searchstoragestechtargetscom:defniton:race-conditon

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Question 6

Afer being notfed of an issue with the online shopping cart, where customers are able to arbitrarily change the price of listed items, a programmer analyzes the following piece of code used by a web based shopping carts

SELECT ITEM FROM CART WHERE ITEMdADDSLASHES($USERINPUT);

The programmer found that every tme a user adds an item to the cart, a temporary fle is created on the web server :tmp directorys The temporary fle has a name which is generated by concatenatng the content of the $USERINPUT variable and a tmestamp in the form of MM-DD-YYYY, (esgs smartphone-12-28-2013stmp) containing the price of the item being purchaseds Which of the following is MOST likely being eeploited to manipulate the price of a shopping cart’s items?

As Input validaton

Bs SQL injecton

Cs TOCTOU

Ds Session hijacking

Aoswern C

Eeplanatonn

In this queston, TOCTOU is being eeploited to allow the user to modify the temp fle that contains the price of the items

In sofware development, tme of check to tme of use (TOCTOU) is a class of sofware bug caused by changes in a system between the checking of a conditon (such as a security credental) and the use of the results of that checks This is one eeample of a race conditons

A simple eeample is as followsn Consider a Web applicaton that allows a user to edit pages, and also allows administrators to lock pages to prevent editngs A user requests to edit a page, getng a form which can be used to alter its contents Before the user submits the form, an administrator locks the page, which should prevent editngs However, since editng has already begun, when the user submits the form, those edits (which have already been made) are accepteds When the user began editng, the appropriate authorizaton was checked, and the user was indeed allowed to edits However, the authorizaton was used later, at a tme when edits should no longer have been alloweds

TOCTOU race conditons are most common in Unie between operatons on the fle system, but can occur in other conteets, including local sockets and improper use of database transactonss

Incorrect Answersn

An Input validaton is used to ensure that the correct data is entered into a felds For eeample, input validaton would prevent leters typed into a feld that eepects number from being accepteds The eeploit in this queston is not an eeample of input validatons

Bn SQL injecton is a type of security eeploit in which the atacker adds Structured Query Language (SQL) code to a Web form input boe to gain access to resources or make changes to datas The eeploit in this queston is not an eeample of a SQL injecton atacks

Dn Session hijacking, also known as TCP session hijacking, is a method of taking over a Web user session by obtaining the session ID and masquerading as the authorized users The eeploit in this queston is not an eeample of session hijackings

Referencesn htpsn::enswikipediasorg:wiki:Time_of_check_to_tme_of_use

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Question 15

select id, frstname, lastname from authors User inputd frstnamed Hack;man

lastnamedJohnson

Which of the following types of atacks is the user atemptng?

As XML injecton

Bs Command injecton

Cs Cross-site scriptng

Ds SQL injecton

Aoswern D

Eeplanatonn

The code in the queston is SQL codes The atack is a SQL injecton atacks

SQL injecton is a code injecton technique, used to atack data-driven applicatons, in which malicious SQL statements are inserted into an entry feld for eeecuton (esgs to dump the database contents to the atacker)s SQL injecton must eeploit a security vulnerability in an applicaton’s sofware, for eeample, when user input is either incorrectly fltered for string literal escape characters embedded in SQL statements or user input is not strongly typed and uneepectedly eeecuteds SQL injecton is mostly known as an atack vector for websites but can be used to atack any type of SQL databases

Incorrect Answersn

An The code in the queston is not XML codes Therefore this is not an XML injecton atack so this answer is incorrects

Bn Command injecton is an atack in which the goal is eeecuton of arbitrary commands on the host operatng system via a vulnerable applicatons Command injecton atacks are possible when an applicaton passes unsafe user supplied data (forms, cookies, HTTP headers etcs) to a system shells The code in the queston is not the type of code you would use in a command injecton atacks

Cn Cross-site scriptng (XSS) is a type of computer security vulnerability typically found in Web applicatonss XSS enables atackers to inject client-side script into Web pages viewed by other userss The code in the queston is not the type of code you would use in an XSS atacks

Referencesn htpn::enswikipediasorg:wiki:SQL_injecton

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Question 3

A systems administrator establishes a CIFS share on a UNIX device to share data to Windows systemss The security authentcaton on the Windows domain is set to the highest levels Windows users are statng that they cannot authentcate to the UNIX shares Which of the following setngs on the UNIX server would correct this problem?

As Refuse LM and only accept NTLMv2

Bs Accept only LM

Cs Refuse NTLMv2 and accept LM

Ds Accept only NTLM

Aoswern A

Eeplanatonn

In a Windows network, NT LAN Manager (NTLM) is a suite of Microsof security protocols that provides authentcaton, integrity, and confdentality to userss NTLM is the successor to the authentcaton protocol in Microsof LAN Manager (LANMAN or LM), an older Microsof product, and atempts to provide backwards compatbility with LANMANs NTLM version 2 (NTLMv2), which was introduced in Windows NT 4s0 SP4 (and natvely supported in Windows 2000), enhances NTLM security by hardening the protocol against many spoofng atacks, and adding the ability for a server to authentcate to the clients

This queston states that the security authentcaton on the Windows domain is set to the highest levels This will be NTLMv2s Therefore, the answer to the queston is to allow NTLMv2 which will enable the Windows users to connect to the UNIX servers To improve security, we should disable the old and

insecure LM protocol as it is not used by the Windows computerss Incorrect Answersn

Bn The queston states that the security authentcaton on the Windows domain is set to the highest levels This will be NTLMv2, not LMs

Cn The queston states that the security authentcaton on the Windows domain is set to the highest levels This will be NTLMv2, not LM so we need to allow NTLMv2s

Dn The queston states that the security authentcaton on the Windows domain is set to the highest levels This will be NTLMv2, not NTLM (version1)s

Referencesn htpsn::enswikipediasorg:wiki:NT_LAN_Manager

Question 8

Joe, a hacker, has discovered he can specifcally craf a webpage that when viewed in a browser crashes the browser and then allows him to gain remote code eeecuton in the conteet of the victm’s privilege levels The browser crashes due to an eecepton error when a heap memory that is unused is accesseds Which of the following BEST describes the applicaton issue?

As Integer overfow

Bs Click-jacking

Cs Race conditon

Ds SQL injecton

Es Use afer free

Fs Input validaton

Aoswern E

Eeplanatonn

Use-Afer-Free vulnerabilites are a type of memory corrupton faw that can be leveraged by hackers to eeecute arbitrary codes

Use Afer Free specifcally refers to the atempt to access memory afer it has been freed, which can cause a program to crash or, in the case of a Use-Afer-Free faw, can potentally result in the eeecuton of arbitrary code or even enable full remote code eeecuton capabilitess

According to the Use Afer Free defniton on the Common Weakness Enumeraton (CWE) website, a Use Afer Free scenario can occur when “the memory in queston is allocated to another pointer validly at some point afer it has been freeds The original pointer to the freed memory is used again and points to somewhere within the new allocatons As the data is changed, it corrupts the validly used memory; this induces undefned behavior in the processs”

Incorrect Answersn

An Integer overfow is the result of an atempt by a CPU to arithmetcally generate a number larger than what can ft in the devoted memory storage spaces Arithmetc operatons always have the potental of returning uneepected values, which may cause an error that forces the whole program to shut downs This is not what is described in this questons

Bn Clickjacking is a malicious technique of tricking a Web user into clicking on something diferent from what the user perceives they are clicking on, thus potentally revealing confdental informaton or taking control of their computer while clicking on seemingly innocuous web pagess This is not what is described in this questons

Cn A race conditon is an undesirable situaton that occurs when a device or system atempts to perform two or more operatons at the same tme, but because of the nature of the device or system, the operatons must be done in the proper sequence to be done correctlys This is not what is described in this questons

Dn SQL injecton is a type of security eeploit in which the atacker adds Structured Query Language (SQL) code to a Web form input boe to gain access to resources or make changes to datas This is not what is described in this questons

Fn Input validaton is used to ensure that the correct data is entered into a felds For eeample, input validaton would prevent leters typed into a feld that eepects number from being accepteds This is not what is described in this questons

Referencesn htpn::wwwswebopediascom:TERM:U:use-afer-freeshtml htpsn::enswikipediasorg:wiki:Clickjacking htpn::searchstoragestechtargetscom:defniton:race-conditon