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Re: Default SSL Keys in Multiple Routers
From: Craig Heffner <cheffner () devttys0 com>
Date: Sun, 19 Dec 2010 13:03:23 -0500

From a security standpoint, it is. But it's easier and probably more cost
effective for the manufacturer.

Sometimes the key will be different between firmware versions, sometimes it
won't. Sometimes the same key will be used for two different models. It just
depends. Some models don't have hard coded keys, but most of the consumer
grade stuff (and even some of the low-end business stuff) does.

- Craig

On Sun, Dec 19, 2010 at 12:17 PM, Thor (Hammer of God) <thor () hammerofgod com
wrote:

 These manufacturers use the same key on each of their models?  That seems
ridiculous to me...
T
------------------------------
From: Craig Heffner
Sent: Sunday, December 19, 2010 5:56 AM
To: full-disclosure () lists grok org uk
Subject: [Full-disclosure] Default SSL Keys in Multiple Routers


Many routers that provide an HTTPS administrative interface use default or
hard-coded SSL keys that can be recovered by extracting the file system from
the device's firmware.

The LittleBlackBox project contains a database of over 2,000 (and growing)
private SSL keys that are correlated with their respective public
certificates, and hardware/firmware versions. While most of these
certificates are from DD-WRT firmware, there are also private keys from
other vendors including Cisco, Linksys, D-Link and Netgear.

Private keys can be recovered by supplying LittleBlackBox with the
corresponding public key. If the public key is not readily available,
LittleBlackBox can retrieve the public certificate from a pcap file, live
traffic capture, or by directly querying the target host.

LittleBlackBox can be downloaded from http://littleblackbox.googlecode.com
.

More information is available at
http://www.devttys0.com/2010/12/breaking-ssl-on-embedded-devices/.


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