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Attacking a co-hosted VM: A hacker, a hammer and two memory modules - This is Security :: by Stormshield
Row-hammer is hardware bug that can cause bit-flips in physical RAM. Mark Seaborn and Thomas Dullien were the first to exploit the DRAM row-hammer bug to gain kernel privileges. Kaveh Razavi et al. pushed the exploitation of row-hammer bugs to the next level. They abused an OS feature – memory de-duplication – to surgically flip bits in a controlled way. They succeeded in flipping bits in memory loaded sensitive files (e.g. authorized_keys) assuming they know their contents. By weakening RSA moduli in authorized_keys file, they were able to generate corresponding private keys and authenticate on a co-hosted victim VM.

In this post, we aim to showcase a different attack scenario. Instead of corrupting memory loaded files, we chose to corrupt the state of a running program. The libpam is an attractive target since it provides authentication mechanisms on widely deployed *nix systems.

By running an instance of a row-hammer attack on an attacker VM, we were able to successfully authenticate on an adjacent victim VM by corrupting the state of pam_unix.so module.
security  research  memory 
16 hours ago by Chirael
How JavaScript works: memory management how to handle 4 common memory leaks
A few weeks ago we started a series aimed at digging deeper into JavaScript and how it actually works: we thought that by knowing the building blocks of JavaScript and how they come to play together…
javascript  js  inner  working  memorymanagement  performance  memory  leak 
yesterday by gilberto5757

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