Skip to main content

Google Public DNS Servers Hijacked on 16th March 2014

Google Public DNS Servers i.e., (which are running in Anycast mode)  was hijacked on 16th of March 2014 for the Internet users of Venezuela and Brazil for nearly 22 mins.

Google's Public DNS servers are used for "130 billion DNS queries on average (peaking at 150 billion) from more than 70 million unique IP addresses each day." This makes Google most popular Public DNS service in the Internet world.
It is suspected that Hackers exploited a well-know vulnerability in Border Gateway Protocol. There is no-way in BGP to check if particular IP address segment belongs to a particular ISP.
RPKI and BGPSEC are the solution of this flaw but these two protocols are still in initial phase and lot or works needs to be done on these protocols.

In this particular case, attack kept users from using the internet but no malicious activity has been traced till yet. No redirection of DNS traffic to rogue servers has been traced.
This lead to suspect that someone might have mis-configured the router which leads to an announcement of segment from AS7908 (BT AS number) instead of AS15169 (Google AS number).

This is not the first time that Google DNS Server was hijacked. Previously in 2010 also, it has been Hijacked and traffic was redirected to Romania & Austria.

We still don't know what exactly has happened. We are waiting for an official announcement from Google (if they ever make the same). But this lead to show that how much vulnerable we are in the Internet world even today.

Popular posts from this blog

Identity PSK ( iPSK)

With the evolution of IoT (Internet of Things), devices that connect wirelessly have increased many folds. From webcams, Smartwatches, fitness bands, firestick, Alexa, Google Home, and many more.., everything is going wireless for connectivity and so does the security threat. The main concern with IoT devices is the unavailability of the full wireless protocol stack (and in the majority of devices, support of 802.1x is not available). So, previously we only have the WPA-PSK option for connecting the IoT devices.  In WPA*-PSK (WPA or WPA2) WLAN, a Pre-Shared Key (PSK) is configured and distributed to all the clients that connect to the WLAN. This leads to PSK leakage, and it can be accessible to unauthorized users (due to the nature of common PSK across all the devices).  Therefore, there was a need to provision unique PSK or Multiple PSK per SSID. Identity-PSKs are unique pre-shared keys created for clients/groups on the same WLAN. Features of iPSK:-   1.Unique PSK for individual Cli

Flaw in ServerKeyExchange messages of TLS Protocol

Here we will discuss the flaw in the ServerKeyExchange messages of the TLS protocol which caused the Logjam attack over TLS while using Diffie-Hellman Key Exchange. Before SSLv3, we don't use to authenticate the ServerKeyExchange messages where server negotiates with client regarding usage of cipersuite and parameters. From onwards SSLv3, TLS send the signed message where it mention about parameters it will use but remain silent over ciphersuite. Or in other words, signed portion contains parameters but not contain information about ciphersuite the server will going to use. Now just to remind you, the difference between DH and DH-EXPORT is the size of parameters only. So how to use this flaw - If the server supports DH-EXPORT, an attacker (Men-in-the-Middle) can edit the negotiation sent by the client (even if client doesn't support DH-EXPORT), and replace the list of client supported ciphersuite with DH-EXPORT only. The server will in turn send back a