[x]
Posted via EE Mobile

Search, ask, and monitor your questions on the go with EE Mobile. Visit Experts Exchange from your mobile device and never be out of touch again.
Question
[x]
Attachment Details
[x]
The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

  • The Grade of the Solution
  • The Zone Rank of the Expert Providing the Solution
  • The Number of Author and Expert Comments
  • The Number of Experts Contributing
  • The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!
6.6

Buffer Overflow Bomb Phase 1

Asked by purewin in Assembly Programming Language, C Programming Language

Just wanted to make sure I'm starting in the right direction with this one. I would start off by replacing the call to smoke() from phase 0 with the address of fizz() correct?

Level 1: Sparkler (20 pts)

Within the file bufbomb there is also a function fizz() having the following C code:
void fizz(int val)
{
entry_check(1); /* Make sure entered this function properly */
if (val == cookie) {
printf("Fizz!: You called fizz(0x%x)\n", val);
validate(1);
}
else
printf("Misfire: You called fizz(0x%x)\n", val);
exit(0);
}
Similar to Level 0, your task is to get bufbomb to execute the code for fizz() rather than returning to test. In this case, however, you must make it appear to fizz() as if you have passed your cookie as its argument. You can do this by encoding your cookie in the appropriate place within your exploit string.
Note that the program wont really call fizz() it will simply execute its code. This has important implications for where on the stack you want to place your cookie.
[+][-]11/03/09 11:09 AM, ID: 25732337Accepted Solution

View this solution now by starting your 30-day free trial. Setting up your free trial is quick, easy, and secure. We will return you to this solution, unlocked, when you're done.

About this solution

Zones: Assembly Programming Language, C Programming Language
Sign Up Now!
Solution Provided By: purewin
Participating Experts: 0
Solution Grade: A
 
[+][-]11/03/09 01:17 PM, ID: 25733786Author Comment

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

Start your 30-day free trial to view this Author Comment or ask the Experts your question.

 
 
Loading Advertisement...
20091021-EE-VQP-81 - Hierarchy / EE_QW_3_20080625