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Google identified new threat related to hacking of DDR4 RAM

Half Double: The latest threat to DRAMs

Recently, Google announced that it has discovered that a new technique of hacking could severely impact the performance of system resulting in hacking of whole system. According to Google, the technique is based on previously known hacking vulnerability which is called "Rowhammer".

        Rowhammer first came to known in year 2014 and it had great impact upon then mainstream DRAM known as DDR3. This technique results in access to editing ability of multiple memory addresses by just making request for a single memory address. Google has continuously followed this issue and published in 2015 a working exploit. 
            The Rowhammer vulnerability is due to electrical coupling phenomenon that occurs in silicon chips. This allow the technique to bypass the software and hardware focused protections. Different manufacturers of DRAM put logic gates to avoid the issue of Rowhammer in future. Rowhammer can be exploited through methods such as TRRespass.
               Now, Google has discovered a new technique that is based on Rowhammer. It is known as "Half Double". This technique allows reaching more memory addresses than simple Rowhammer technique.
            Google hopes that bringing this defect into public view will pressurized the manufacturers to work effectively on removing the issue. Google has also started working with JEDEC, which is a semiconductor trade and engineering solutions to generate a permanent solution to this issue.

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