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- Written by Michael Bann
FTP (300 points)
We found an ftp service, I'm sure there's some way to log on to it.
nc 54.175.183.202 12012
ftp_0319deb1c1c033af28613c57da686aa7
We're given a binary. Let's see what it is:
$ file ftp_0319deb1c1c033af28613c57da686aa7
ftp: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, BuildID[sha1]=43afbcd9f4e163f002970b9e69309ce0f1902324, stripped
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- Written by Michael Bann
I was sniffing some web traffic for a while, I think i finally got something interesting. Help me find flag through all these packets.
net_756d631588cb0a400cc16d1848a5f0fb.pcap
This was a 100 point challenge. Overall it was pretty fun. First thing to do with the pcap is strings it and look for an easy win. While we didn't get an easy win here, we did get a nice reference point:
$ strings net_756d631588cb0a400cc16d1848a5f0fb.pcap | grep -i flag
FLAG = 'flag{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx}'
print encode(FLAG, cnt=?)
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- Written by Michael Bann
Precision was an exploit challenge worth 100 points. We're given a binary, and a server that it's running on, and told to exploit it. Let's take a look at the binary.
$ file precision
precision: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=929fc6f283d6f6c3c039ee19bc846e927103ebcd, not stripped
As you can see, it's a 32-bit elf binary using shared libs. Also, it's not stripped, which is nice because it means that named symbols will still be present in the binary (to make reversing easier). Seeing as the goal here is to exploit it, let's take a look at the security controls baked in.
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- Written by Michael Bann
ones_and_zer0es (50 points)
eps1.1_ones-and-zer0es_c4368e65e1883044f3917485ec928173.mpeg
This was a warm-up "challenge". I'm including it as a writeup primarily because I have never posted previously about how to binary translate things like this. The file you download ends in .mpeg, but it's not an mpeg. In fact, the first thing I do with any challenge is to run the Linux "file" command on it.