Legacy Auth

An old authentication daemon was discovered running on an internal server. The sysadmin claims it's been there "since the early 2000s" and refuses to update it.

Your mission: Bypass the authentication and retrieve the flag.

Binary Information:

Filename: legacy-auth
Size:     11,856 bytes (12 KB)
MD5:      bb21db159e71c78f369678ea523782e5
SHA1:     41c25d9956149e73135ecb42944d42fad610e3b6
SHA256:   b60ca1e90b28e58b1e2af382f73716a79cf7e2f02b8f988db74003ee858a3a87

Verify integrity after download:

md5sum legacy-auth
sha1sum legacy-auth
sha256sum legacy-auth

Environment:
- Architecture: x86 (32-bit)
- Stack protector: Disabled
- NX: Disabled
- PIE: Disabled
- Symbols: Not stripped

Tip: Start by examining what functions exist in the binary...