Added unix-privesc-check

tools/unix-privesc-check.md

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+# unix-privesc-check
+
+Notes
+-------
+
+Help Text
+-------
+```
+unix-privesc-check v1.4 ( http://pentestmonkey.net/tools/unix-privesc-check )
+
+Usage: unix-privesc-check { standard | detailed }
+
+"standard" mode: Speed-optimised check of lots of security settings.
+
+"detailed" mode: Same as standard mode, but also checks perms of open file
+                 handles and called files (e.g. parsed from shell scripts,
+                 linked .so files).  This mode is slow and prone to false 
+                 positives but might help you find more subtle flaws in 3rd
+                 party programs.
+
+This script checks file permissions and other settings that could allow
+local users to escalate privileges.
+
+Use of this script is only permitted on systems which you have been granted
+legal permission to perform a security assessment of.  Apart from this 
+condition the GPL v2 applies.
+
+Search the output for the word 'WARNING'.  If you don't see it then this
+script didn't find any problems.
+
+```
+
+Example Usage
+-------
+
+Links
+-------
+