memory bit flipping | Breaking Cybersecurity News | The Hacker News

A team of cybersecurity researchers yesterday revealed details of a new side-channel attack on dynamic random-access memory (DRAM) that could allow malicious programs installed on a modern system to read sensitive memory data from other processes running on the same hardware. Dubbed RAMBleed and identified as CVE-2019-0174 , the new attack is based on a well-known class of DRAM side channel attack called Rowhammer , various variants [ GLitch , RAMpage , Throwhammer ,  Nethammer , Drammer ] of which have been demonstrated by researchers in recent years. Known since 2012, Rowhammer bug is a hardware reliability issue that was found in the new generation of DRAM chips. It turned out that repeatedly and rapidly accessing (hammering) a row of memory can cause bit flips in adjacent rows, i.e., changing their bit values from 0 to 1 or vice-versa. In the following years, researchers also demonstrated successful exploits to achieve privilege escalation on the vulnerable computers...

Security researchers have find out ways to hijack the Intel-compatible PCs running Linux by exploiting the physical weaknesses in certain varieties of DDR DRAM (double data rate dynamic random-access memory) chips and gaining higher kernel privileges on the system. The technique, dubbed " rowhammer ", was outlined in a blog post published Monday by Google's Project Zero security initiative, a team of top security researchers dedicatedly identifies severe zero-day vulnerabilities in different software. Rowhammer is a problem with recent generation DRAM chips in which repeatedly accessing a row of memory can cause " bit flipping " in an adjacent row which could allow anyone to change the value of contents stored in computer memory. WHAT IS ROWHAMMER BUG DDR memory is arranged in an array of rows and columns, which are assigned to various services, applications and OS resources in large blocks. In order to prevent each application from access...

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