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DRAM RowHammer Vulnerability | Breaking Cybersecurity News | The Hacker News

Poor Rowhammer Fixes On DDR4 DRAM Chips Re-Enable Bit Flipping Attacks

Poor Rowhammer Fixes On DDR4 DRAM Chips Re-Enable Bit Flipping Attacks
Mar 10, 2020
Remember rowhammer vulnerability? A critical issue affecting modern DRAM (dynamic random access memory) chips that could allow attackers to obtain higher kernel privileges on a targeted system by repeatedly accessing memory cells and induce bit flips. To mitigate Rowhammer vulnerability on the latest DDR4 DRAM, many memory chip manufacturers added some defenses under the umbrella term Target Row Refresh (TRR) that refreshes adjacent rows when a victim row is accessed more than a threshold. But it turns out 'Target Row Refresh,' promoted as a silver bullet to mitigate rowhammer attacks, is also insufficient and could let attackers execute new hammering patterns and re-enable the bit-flip attacks on the latest hardware as well. TRRespass: The Rowhammer Fuzzing Tool Tracked as CVE-2020-10255 , the newly reported vulnerability was discovered by researchers at VUSec Lab, who today also released ' TRRespass ,' an open source black box many-sided RowHammer fuzzin

RAMpage Attack Explained—Exploiting RowHammer On Android Again!

RAMpage Attack Explained—Exploiting RowHammer On Android Again!
Jun 29, 2018
A team of security researchers has discovered a new set of techniques that could allow hackers to bypass all kind of present mitigations put in place to prevent DMA-based Rowhammer attacks against Android devices. Dubbed RAMpage , the new technique (CVE-2018-9442) could re-enable an unprivileged Android app running on the victim's device to take advantage from the previously disclosed Drammer attack , a variant of DRAM Rowhammer  hardware vulnerability for Android devices, in an attempt to gain root privileges on the target device. You might have already read a few articles about RAMpage on the Internet or even the research paper, but if you are still unable to understand— what the heck is RAMpage —we have briefed the research in language everyone can understand. Before jumping directly on the details of RAMpage, it is important for you to understand what is RowHammer vulnerability, how it can be exploited using Drammer attack to hack Android devices and what mitigations G

Nethammer—Exploiting DRAM Rowhammer Bug Through Network Requests

Nethammer—Exploiting DRAM Rowhammer Bug Through Network Requests
May 17, 2018
Last week, we reported about the first network-based remote Rowhammer attack, dubbed Throwhammer , which involves the exploitation a known vulnerability in DRAM through network cards using remote direct memory access (RDMA) channels. However, a separate team of security researchers has now demonstrated a second network-based remote Rowhammer technique that can be used to attack systems using uncached memory or flush instruction while processing the network requests. The research was carried out by researchers who discovered Meltdown and Spectre CPU vulnerabilities, which is independent of the Amsterdam researchers who presented a series of Rowhammer attacks, including Throwhammer published last week. If you are unaware, Rowhammer is a critical issue with recent generation dynamic random access memory (DRAM) chips in which repeatedly accessing a row of memory can cause "bit flipping" in an adjacent row, allowing attackers to change the contents of the memory. The

Guide: Secure Your Privileged Access with Our Expert-Approved Template

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websiteDelineaIT Security / Access Control Security
Transform your Privileged Access Management with our Policy Template—over 40 expertly crafted statements to elevate compliance and streamline your security.

A SaaS Security Challenge: Getting Permissions All in One Place 

A SaaS Security Challenge: Getting Permissions All in One Place
May 08, 2024Attack Surface / SaaS Security
Permissions in SaaS platforms like Salesforce, Workday, and Microsoft 365 are remarkably precise. They spell out exactly which users have access to which data sets. The terminology differs between apps, but each user's base permission is determined by their role, while additional permissions may be granted based on tasks or projects they are involved with. Layered on top of that are custom permissions required by an individual user.  For example, look at a sales rep who is involved in a tiger team investigating churn while also training two new employees. The sales rep's role would grant her one set of permissions to access prospect data, while the tiger team project would grant access to existing customer data. Meanwhile, special permissions are set up, providing the sales rep with visibility into the accounts of the two new employees. While these permissions are precise, however, they are also very complex. Application admins don't have a single screen within these applications th

New Rowhammer Attack Can Hijack Computers Remotely Over the Network

New Rowhammer Attack Can Hijack Computers Remotely Over the Network
May 11, 2018
Exploitation of Rowhammer attack just got easier. Dubbed ' Throwhammer ,' the newly discovered technique could allow attackers to launch Rowhammer attack on the targeted systems just by sending specially crafted packets to the vulnerable network cards over the local area network. Known since 2012, Rowhammer is a severe issue with recent generation dynamic random access memory (DRAM) chips in which repeatedly accessing a row of memory can cause "bit flipping" in an adjacent row, allowing anyone to change the contents of computer memory. The issue has since been exploited in a number of ways to achieve remote code execution on the vulnerable computers and servers. Just last week, security researchers detailed a proof-of-concept Rowhammer attack technique, dubbed GLitch , that leverages embedded graphics processing units (GPUs) to carry out Rowhammer attacks against Android devices. However, all previously known Rowhammer attack techniques required privilege escal

GLitch: New 'Rowhammer' Attack Can Remotely Hijack Android Phones

GLitch: New 'Rowhammer' Attack Can Remotely Hijack Android Phones
May 04, 2018
For the very first time, security researchers have discovered an effective way to exploit a four-year-old hacking technique called Rowhammer to hijack an Android phone remotely. Dubbed GLitch , the proof-of-concept technique is a new addition to the Rowhammer attack series which leverages embedded graphics processing units (GPUs) to carry out a Rowhammer attack against Android smartphones. Rowhammer is a problem with recent generation dynamic random access memory (DRAM) chips in which repeatedly accessing a row of memory can cause "bit flipping" in an adjacent row, allowing anyone to change the value of contents stored in computer memory. Known since at least 2012, the issue was first exploited by Google's Project Zero researchers in early 2015, when they pulled off remote Rowhammer attacks on computers running Windows and Linux. Last year, a team of researchers in the VUSec Lab at Vrije Universiteit Amsterdam demonstrated that the Rowhammer technique could

DRAM Rowhammer vulnerability Leads to Kernel Privilege Escalation

DRAM Rowhammer vulnerability Leads to Kernel Privilege Escalation
Mar 10, 2015
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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