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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/52452/info

Light Display Manager (LightDM) is prone to a local arbitrary-file-deletion vulnerability.

A local attacker can exploit this issue to delete arbitrary files with administrator privileges.

Light Display Manager (LightDM) 1.0.6 is vulnerable. Other versions may also be affected. 

/usr/sbin/guest-account has this cleanup:

# remove leftovers in /tmp
find /tmp -mindepth 1 -maxdepth 1 -uid "$UID" | xargs rm -rf || true

This runs with the cwd of the last logged in user. If the user creates a file "/tmp/x a", the file "a" gets removed from the last user's login.