A Unicode Directory Traversal Attack primarily relies on which tactic?

A Unicode Directory Traversal Attack primarily relies on which tactic?

• A. It relies on standard ASCII path handling to access files.
• B. It leverages social engineering to gain credentials.
• C. It uses Unicode encoding to bypass normal path restrictions.
• D. It spoofing DNS responses.

Answer: (C)

A key idea here is how path validation and canonicalization can fail when Unicode is involved. In a Unicode Directory Traversal attack, the attacker exploits lax handling of path normalization by encoding traversal characters in Unicode. The server may decode or render these inputs in a way that reconstructs a path going up the directory tree, even though the raw input didn’t look like a traversal attempt. By using Unicode encodings of dots, slashes, or other path-separators, the attack can bypass straightforward checks that only look for ASCII patterns such as “..” or “/..”. This is why this option is the best choice: it directly targets how path restrictions are enforced, leveraging Unicode to slip past those safeguards and access files outside the intended directory. The other options don’t fit the tactic—social engineering isn’t about manipulating path resolution, and DNS spoofing is unrelated to local file access path checks. Relying on standard ASCII path handling would not explain the bypass the Unicode approach provides.

A key idea here is how path validation and canonicalization can fail when Unicode is involved. In a Unicode Directory Traversal attack, the attacker exploits lax handling of path normalization by encoding traversal characters in Unicode. The server may decode or render these inputs in a way that reconstructs a path going up the directory tree, even though the raw input didn’t look like a traversal attempt. By using Unicode encodings of dots, slashes, or other path-separators, the attack can bypass straightforward checks that only look for ASCII patterns such as “..” or “/..”.

This is why this option is the best choice: it directly targets how path restrictions are enforced, leveraging Unicode to slip past those safeguards and access files outside the intended directory. The other options don’t fit the tactic—social engineering isn’t about manipulating path resolution, and DNS spoofing is unrelated to local file access path checks. Relying on standard ASCII path handling would not explain the bypass the Unicode approach provides.