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php-type-juggling

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PHP type juggling and magic hash attacks — exploit loose comparison (==) with 0e-prefixed hash collisions and NULL returns to bypass authentication.

packages/decepticon/decepticon/skills/standard/exploit/web/php-type-juggling/SKILL.md

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# PHP Type Juggling and Magic Hash Attacks

> **Authorized-use only.** Only test systems you own or have explicit written permission to test. Unauthorized exploitation violates computer-fraud laws worldwide.

PHP is a loosely typed language. When comparing values with `==` (loose) rather than `===` (strict), PHP coerces types — a string beginning with `0e` followed only by digits is treated as scientific notation and equals `0`. An attacker who controls one side of a comparison can force equality with predictable hash outputs ("magic hashes"), bypass HMAC checks, or exploit NULL returns from type errors.

Affects PHP 5.x–7.x broadly; PHP 8.0+ fixed most numeric-string comparisons but edge cases remain.

## ATT&CK Mapping

| Technique | Notes |
|-----------|-------|
| T1190 | Exploit public-facing application — auth bypass via comparison flaw |
| T1606.001 | Forge web credentials — force authentication with crafted hash values |
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