![]() So the saved return address is 28 bytes after the end of the canary. Now on the Fusion VM, I can check what the value of the EIP register dmesg | tail -n1 ![]() Opening connection to fusion on port 20004: Done ![]() Now I need to figure out how far after the canary the saved return address is:Īndrew ~/fusion/level04 $. Print(f"Password so far: ")Īndrew ~/fusion/level04 $. I spotted a buffer overflow in the validate_credentials() function:īase64_decode(line, strlen(line), details, &output_len) Next, I’ll look for vulnerabilities to see if I can bypass that authentication. If you just click cancel on the dialog, you’ll get a “401 Unauthorized” message. So the first thing I did was open a browser and tried to connect to the Fusion VM over port 20004:Īs you can see, some basic authentication is required. Starting with the comments, we can see that this is an HTTP server based on an open source implementation called micro_httpd. Like the last level, I won’t go into great detail with all the source code since most of it doesn’t matter. 5 Creating a ROP Chain Source Code Analysis
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