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Course 28 - Denial of Service and Elevation of Privilege | Episode 5: Input Manipulation and the Path to Elevation of Privilege
Published 1 month, 4 weeks ago
Description
In this lesson, you’ll learn about:
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- Elevation of Privilege (EoP), where attackers gain unauthorized access—ranging from executing limited commands to achieving full administrative or root control.
- The role of untrusted input:
- How attackers manipulate input to trick systems into treating data as executable code.
- Why input validation failures are a primary cause of privilege escalation.
- How parsers are exploited, focusing on three main categories:
- Length issues: Incorrect handling of input size leading to vulnerabilities like buffer overflows and unsafe deserialization.
- Token separation: Abuse of meta-characters (e.g., ;) to alter command execution flow.
- Encoding/decoding flaws: Injecting malicious characters during encoding transformations to bypass filters.
- Common attack vectors:
- Path traversal: Accessing restricted files using sequences like ../ (e.g., /etc/passwd).
- Command injection: Executing unintended system commands via interpreters like Bash or Python.
- Cross-Site Scripting (XSS): Injecting malicious scripts into web applications to run in users’ browsers.
- Interpreter and system behavior:
- How shells process subshells, environment variables, and execution order.
- Why these mechanisms can be abused to escalate privileges.
- Defensive strategies:
- Strict input validation: Allow only safe, expected characters (e.g., A–Z, 0–9).
- Defensive parsing: Treat all external input as untrusted by default.
- Privilege attenuation: Limit permissions so that even if exploited, damage is contained.
- Secure design principles, ensuring that:
- Input is never trusted without validation
- Parsers are hardened against manipulation
- Systems minimize the impact of successful attacks
You can listen and download our episodes for free on more than 10 different platforms:
https://linktr.ee/cybercode_academy