Catch up on stories from the past week (and beyond) at the Slashdot story archive


Forgot your password?

Submission Sniff and decrypt BLE with Ubertooth->

mpeg4codec writes: Hot on the heels of Omri Iluz's BLE-sniffer-on-the-cheap, I decided to write up the BLE (Bluetooth Smart) sniffer I built on Ubertooth. My sniffer is highly robust, can capture data from connections, and is 100% open source.

I also discovered a major flaw in BLE's crypto that allows an attacker to crack its encryption key and decrypt data, 100% passively. I wrote a tool called crackle that will automatically decrypt encrypted BLE data captured by Ubertooth.

Link to Original Source

Comment Re:RTFA, everyone... (Score 1) 46

I built a BLE sniffer on Ubertooth which does capture traffic on BLE data channels. Also I wrote a tool that can crack the pairing protocol and decrypt the data.

It is more expensive than the sniffer in the article ($120) but very robust. I achieve the requisite frequency agility by handling timing in real-time on the microcontroller on the dongle.

Comment Re:What security does Bluetooth have? (Score 4, Informative) 46

Hi, I'm a Bluetooth Security researcher. My primary focus is on BLE for which I built a highly robust sniffer on the Ubertooth platform. I have experience in other aspects of Bluetooth.

TL;DR: Classic Bluetooth is very secure, BLE is secure under some circumstances. Even if you leave your Bluetooth on in discoverable mode, there isn't much an attacker can do to harm you barring bugs in your Bluetooth stack.

Bluetooth is a well-designed protocol stack that takes security seriously in its design. Implementation quality (and bugs therein) varies from stack to stack. It's always a good idea to disable Bluetooth if you aren't using it, as is the case with any other remotely accessible feature.

Classic Bluetooth has used Secure Simple Pairing (SSP) since 2.1 in 2007. This pairing mechanism is based on ECDH to provide perfect forward secrecy and is highly secure. There was one weakness discovered in the numeric entry pin mode in 2008 by Andrew Lindell. This mode is not commonly used in older devices and more recent devices do not implement it. It's effectively impossible for an attacker to sniff any data sent over Bluetooth with SSP.

BLE has major weaknesses in its pairing protocol that I spoke about at BlackHat USA 2013 and other venues. For the most recent video see my presentation at USENIX WOOT 13.

In BLE, a passive eavesdropper who is present during pairing can recover the secret key used to encrypt all communications. This effectively makes the security worthless. However, if the attacker is not present during pairing then the encryption is very effective. It uses AES-CCM and doesn't have any major flaws in the design. AES-CCM is used in WPA2-AES; it's well-established and has no major shortcomings.

Finally, some Bluetooth stack implementations have bugs. I've found remote bugs in one major vendor's stack.

Comment Re:No, they didn't (Score 1) 200

When Time Warner did the same thing on my connection, they actually returned the RCODE as NXDOMAIN (implying a failure) along with the A records for the advert page. Resolvers which properly/strictly adhere to the RFC would treat the lookup as a failure, which means that for spam purposes this probably wouldn't have caused an issue. My guess is that web browsers aren't quite as concerned with a strict interpretation of the standards, since they want the users to get to the web site they're looking for under even the strangest of circumstances.

In either case, it's still a shady move by the ISP. At least they provide opt-out, which I guess is better than nothing.

iPhone Root Password Hacked in Three Days 311

unPlugged-2.0 writes "An Australian developer blog writes that the iPhone root password has already been cracked. The story outlines the procedure but doesn't give the actual password. According to the story: 'The information came from an an official Apple iPhone restore image. The archive contains two .dmg disk images: a password encrypted system image and an unencrypted user image. By delving into the unencrypted image inquisitive hackers were able to discover that all iPhones ship with predefined passwords to the accounts 'mobile' and 'root', the last of which being the name of the privileged administration account on UNIX based systems.' Though interesting, it doesn't seem as though the password is good for anything. The article theorizes it may be left over from development work, or could have been included to create a 'false trail' for hackers."

You will lose an important tape file.