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Buffer Overflow


  • Occurs when a program writes more data to a buffer than it can hold or writes data beyond the allocated buffer size.
  • Can lead to data corruption, program crashes, or execution of malicious code.

Vulnerable Applications

  • SLmail 5.5
  • Golden FTP Server 4.70
  • Ultra MiniHTTPd 1.2
  • CloudMe 1.11.2
  • Easy File Sharing Web Server 7.2

Practice Targets

  • These applications are susceptible to stack-based buffer overflow attacks.
  • Practicing on them helps understand and mitigate such vulnerabilities.


  • Data Corruption: Overwriting adjacent memory can corrupt data structures.
  • Program Crashes: Writing beyond buffer boundaries can cause the program to crash.
  • Malicious Code Execution: Attackers can exploit buffer overflow vulnerabilities to inject and execute arbitrary code.

Mitigation Techniques

  • Input Validation: Ensure input data doesn't exceed buffer limits.
  • Bounds Checking: Implement checks to prevent buffer overflow.
  • Use Secure Libraries: Utilize functions that handle buffers safely (e.g., strcpy_s instead of strcpy).
  • Code Reviews: Regularly review code for potential vulnerabilities.
  • Address Space Layout Randomization (ASLR): Randomize memory locations to make it harder for attackers to predict addresses for exploitation.