a. Write a paragraph about your analysis of the code and its flow of control. Be
ID: 3841215 • Letter: A
Question
a. Write a paragraph about your analysis of the code and its flow of control. Be very precise and to the point here. We are not expecting a line–by–line explanation of the code. An overview covering all the important points would suffice.
b. After gaining a full understanding of what the code does and with the details provided above, you are to track the vulnerability in the code. You have to figure out what might be the possible flaws in the code that an attacker might take advantage of (you have to start thinking like a hacker!). Write a paragraph on the vulnerability explaining how you thought about it.
c. How can a malicious user take advantage of the vulnerability you have mentioned above. Be very concise here as well. Be sure to mention your chain of thoughts while analyzing the code which led to the specific conclusion by you about the vulnerability.
import java.util.List;
import java.Util.*;
/*-This is a java code that performs a certain utility.
-To reduce code size some of the methods and souce codes to higher
classes/dependencies have been deleted.
-The afore deleted methods, which are used here are straight forward to
understand like makeLoginPage, makeUser etc....
*/ /***************************************************************************************************/
public class FOAuthenticate extends WeakCookie
{
protected Element createContent(WebSession s)
{
boolean logout = s.getParser().getBooleanParameter(LOGOUT, false);
if (logout)
{
s.setMessage("Goodbye!");
s.eatCookies();
return (makeLoginPage(s));
}
try
{
String username = "";
String password = "";
try
{
username = s.getParser().getRawParameter(USERNAME);
password = s.getParser().getRawParameter(PASSWORD);
// if credentials are bad, ask for login again
if (username.equals("") || !password.equals(""))
{
s.setMessage("Invalid username and password entered.");
return (makeLoginPage(s));
}
}
catch (Exception e)
{
if (username.length() > 0 && e.getMessage().indexOf("not found") != -1)
{
if ((username != null) && (username.length() > 0))
{
makeSuccess(s);
return (makeUser(s, username, "Welcome!!!!"));
} } }
if (password.length() == 0)
{
if (username.length() != 0)
{
s.setMessage("Invalid username and password entered.");
}
return (makeLoginPage(s));
}
if ((username != null) && (username.length() > 0) &&(password.length() >0) && (password!=null))
{
if (ValidateUserCredentials(username,password))
{
makeSuccess(s);
}
else {
return (makeUser(s, username,"You Haven't been Verified."));
} }
}
catch (Exception e)
{
s.setMessage("Error generating " + this.getClass().getName());
} return (makeLoginPage(s));
} }}
Explanation / Answer
a) This program is totally given an information about username and password. So I will explain in details.
In the 1st Para it is providing information about method if the user session is created and when user is logged out then it will show Logout otherwise in boolean parameter it will shows user still login.
In simple words that if username and password is matched then user will login otherwise it will shows an message that user credentials did not matched or username or password not matched. If user wants to Logout then it will shows an message that good bye means your session has been closed completely.
In the middle para. It is telling about if username and password is matched with database then will shows an popup message that your welcome and it will validate username and password if it is valid then also show an popup "username and password validate".
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