ldd arbitrary code execution
The ldd utility is more vulnerable than you think. It's frequently used by programmers and system administrators to determine the dynamic library dependencies of executables. Sounds pretty innocent, right? Wrong! In this article I am going to show you how to create an executable that runs arbitrary code if it's examined by ldd. I have also written a social engineering scenario on how you can get y
TCP Traceroute
Did you know you could traceroute over the TCP protocol? The regular traceroute usually uses either ICMP or UDP protocols. Unfortunately, firewalls and routers often block the ICMP protocol completely or disallow the ICMP echo requests (ping requests), and/or block various UDP ports. However, you'd rarely have firewalls and routers drop TCP protocol on port 80 because it's the web port. Check this
TCP Port Scanner in Bash
I just had this quick idea to write a tcp port scanner in bash. Bash supports a special /dev/tcp/host/port file that you can read/write. Writing to this special file makes bash open a tcp connection to host:port. If writing to the port succeeds, the port is open, else the port is closed. At first I wrote this quick script. for port in {1..65535}; do echo >/dev/tcp/google.com/$port && echo "port $p
A Proof That Unix Utility Sed Is Turing Complete
Many people are surprised to learn that sed, a seemingly simple text filtering program, is actually Turing complete. This realization prompts the question: how can a text processing utility achieve such computational power? The answer lies in sed's fundamental operations. Essentially, sed functions as a miniature assembly language, equipped with a comparison operation, branching capabilities, and
A Perl regex that matches composite numbers (and doesn't match prime numbers)
Take a look at this Perl regular expression: perl -lne '(1x$_) =~ /^(11+?)\1+$/ && print "$_ is composite"' This regular expression matches only the composite numbers (and doesn't match prime numbers). Can you figure out how it works? I'll give the explanation below but try to figure it out yourself. Here is what happens when you run it: $ perl -lne '(1x$_) =~ /^(11+?)\1+$/ && print "$_ is composi
Announcing perl1line.txt – A Collection of Handy Perl Scripts
The ultimate goal of the Perl One-Liners Explained article series was to release the perl1line.txt file. Last week I finished the series and today I am happy to announce perl1line.txt – a collection of handy Perl one-liner scripts. Perl1line.txt file contains over a hundred short Perl one-line scripts for various text processing tasks. These tasks include – changing file spacing, numbering lines,
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