Cryptology ePrint Archive: Report 2016/618

Curious case of Rowhammer: Flipping Secret Exponent Bits using Timing Analysis

Sarani Bhattacharya; Debdeep Mukhopadhyay

Abstract: Rowhammer attacks have exposed a serious vulnerability in modern DRAM chips to induce bit flips in data which is stored in memory. In this paper, we develop a methodology to combine timing analysis to perform the hammering in a controlled manner to create bit flips in cryptographic keys which are stored in memory. The attack would require only user level privilege for Linux kernel versions before 4.0 and is unaware of the memory location of the key. An intelligent combination of timing Prime + Probe attack and row-buffer collision is shown to induce bit flip faults in a 1024 bit RSA key on modern processors using realistic number of hammering attempts. This demonstrates the feasibility of fault analysis of ciphers using purely software means on commercial x86 architectures, which to the best of our knowledge has not been reported earlier. The attack is also relevant for the newest Linux kernel in a Cross-VM environment where the VMs having root privilege are not denied to access the pagemap.

Category / Keywords: Rowhammer, fault attack, Prime + Probe, bit flip

Original Publication (in the same form): IACR-CHES-2016

Date: received 14 Jun 2016

Contact author: tinni1989 at gmail com, debdeep mukhopadhyay@gmail com

Available format(s): PDF | BibTeX Citation

Version: 20160616:193104 (All versions of this report)

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