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A simple compiler technique used by programmers is to add a terminator 'canary word' containing...

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A simple compiler technique used by programmers is to add a terminator 'canary word' containing four letters NULL (0x00), CR (0x0d), LF (0x0a) and EOF (0xff) so that most string operations are terminated. If the canary word has been altered when the function returns, and the program responds by emitting an intruder alert into syslog, and then halts what does it indicate?

A.

A buffer overflow attack has been attempted

B.

A buffer overflow attack has already occurred

C.

A firewall has been breached and this is logged

D.

An intrusion detection system has been triggered

E.

The system has crashed

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