Computer memory refers to a physical device that is used to store sequences of instructions (programs) or data (program state information) on a temporary or permanent basis for use in a computer.

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Dynamic memory management i386 vs amd64

I've spotted some differences in the behavior of the GNU/Linux dynamic memory allocator in i386 vs amd64. While it's possible that I'm misunderstanding something ( in this case let me know ), I don't ...
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Is rowhammer comparable to faults caused by radiation?

As far as I know, both rowhammer and radiation based fault injection, can cause arbitrary bit flips in the memory. Are there any differences in matters of possible outcomes of both "attacks" on ...
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How can Windows 10 not have the password in memory?

I have read that Windows 10 does not hold the password in memory from the creator of mimikatz: Starting with 8.x and 10, by default, there is no password in memory. Exceptions: When ...
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Are Heap addresses randomized by ASLR?

I have been reading this article about an Internet Explorer exploit and I am a little confused about why the memory addresses effected by the heap-spray "work". The paper states that the attack uses ...
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5answers
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Recover the prior contents of RAM from a turned-off PC?

I've heard that if your PC is turned off, then an attacker can recover the RAM from the last session. I find this hard to believe. How could it be done?
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1answer
63 views

Why use a passphrase for RSA key?

Today I generated my first key pair, so my knowledge here is - so to speak - very limited. On client side I am using Windows and to log in I use PuTTY and I used PuTTYGen to create the keys. Here ...
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2answers
81 views

How do self-contained executable program exploits work, when considering virtual memory?

My understanding of virtual memory is that the operating system allows each process to have access to the entire pool of memory, and creates this illusion by paging. As a consequence, a program can ...
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1answer
2k views

iPhone 5/6 RAM security

I'm interested in how the RAM can be exploited in iPhone 5+, iOS 8+. I've previously discussed general iPhone encryption and from the response it reads: There are many exploits over the years ...
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5answers
158 views

Can secrets be made safe in memory?

Say, I am running an application on a cloud server such as AWS. Suppose I supply a key at run-time (so its not stored anywhere alongside/inside code), is there a way to secure this key in memory? So ...
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1answer
66 views

Is there a security risk in using pointers instead of struct instances?

Recently during a code review, a senior developer asked me to replace a pointer with structure instance in a utility method. He asked me to do so for security purpose. One reason that I could think of ...
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3answers
73 views

Is it safe to include memory addresses in a program’s output?

I’m writing a program. The input is a complex data structure in memory. The output is an HTML report that contains: (1) a representation of the structure; (2) textual annotations that refer to objects ...
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1answer
114 views

Methods of cold boot attacks in the wild

As far as I know, there are two methods for performing cold boot attacks: Reboot the system into an alternate operating system or BIOS with a minimal memory footprint which automatically exports ...
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2answers
332 views

Do I need to use the cipher command with a newer SSD to erase files?

I've used Eraser in the past, and recently became aware of the cipher command in Windows 8. Specifically, with the /w flag: /w removes data from portions of the volume it can access and have not ...
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277 views

How can I protect my home/office computer against row hammer?

Row hammer seems to affect ECC memory less, but ECC is still not immune. I have heard of software mitigations like ANVIL, but that doesn't seem to be 100% row-hammer-proof either. What software or ...
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3answers
55 views

What is the future of exploitations? [closed]

With the advent of "Safe" languages like Rust, the prevalence of Software Correctness, and improved type checking in existing systems, memory based exploits are very hard if not possible at all, to ...
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1answer
187 views

Was TRESOR integrated in the Linux kernel?

If a computer is switched off, the data can stay in RAM memory for a while; decaying over about 5 minutes. This can be made longer by cooling the chips: ...
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2answers
88 views

encrypting data while in memory

What is the best way to protect sensitive text input and store it in memory until form submission is complete and then clear it out shortly thereafter? I'm looking to protect sensitive information ...
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1answer
70 views

Tool for reading application data before it's encrypted [closed]

For a test, I have a simple client-server Python socket-based application with a self-signed certificate. The code is copied from here. Although I don't see the traffic as TLS in Wireshark (why?), ...
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3answers
252 views

Can someone read a iOS class variable from outside the app?

a class variable like this: @property (strong, nonatomic) NSString *privateValue; Can someone read the value of that variable while it´s in memory? I can´t find anything about this on the apple ...
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2answers
317 views

RAM memory data remanence and double boot, risky?

I wonder if my setup can be risky. To give a good starting point for answers I would briefly sketch the situation setup: double boot system GNU/Linux and Microsoft Windows GNU/Linux is on 2 ...
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1answer
30 views

Are they attacks to steal database records from memory in cloud?

Imagine a hosted database in public cloud. Since the database records are encrypted only on disk (data-at-rest). Are they are any attacks that steal the database records from the memory (when queries ...
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1answer
421 views

Is exposing website performance data a security risk?

I am currently adding a subsite to some websites that allows me to monitor performance data live as the server software perceives it. The data is mostly stuff like amount of memory used, memory ...
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0answers
37 views

Is there value in turning off computer to erase memory? [duplicate]

I still use TrueCrypt, but I was thinking about using VeraCrypt. I noticed on the Wikipedia page for VeraCrypt that the key is stored in the memory. Because of this, I have a general question. To ...
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2answers
52 views

iphone, Electron Microscope can see the ROM cell states

Just one bit gets toggled when the passcode is correct. Why not just toggle that one charged/discharged cell? Determine that bit through experimentation with an electron microscope.
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1answer
94 views

Can I Prevent Internet Explorer from Storing Login Requests in Memory?

Using Internet Explorer 11 I have been able to login to HTTPS web applications by providing a username and password and then subsequently logout. Whilst the browser process is running I can then dump ...
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6answers
10k views

Can RAM retain data after removal?

Is it possible for RAM to retain any data after power is removed? I don't mean within a few minutes such as cold boot Attacks but rather 24 hours plus. Working with classified systems the policy ...
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1answer
160 views

Is it possible for a virus to be redistributed through RAM?

I have a new, formatted, and up-to-date laptop. It's clean of any infections and I'm sure of it. The only change I've made is that I added a new 4G DDR3 RAM stick from my old laptop, and my new one ...
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36 views

What are the differences between paging and segmentation in terms of security?

How do the two techniques differ when it comes to keeping data in memory safe? Which one is safer if one can ask that question. What is meant when it is said that segmentation provides separate ...
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2answers
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How to make / dump contents of memory for forensics analysis?

I work as a Information Security analyst and was recently tasked to look into Incident response + computer forensics related topics. For starters, I am experimenting on my PC which is running Windows ...
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1answer
733 views

What does EMET do for Windows 8.1?

I recall seeing, upon release of Windows 8 a while ago that a number of new mitigations and memory protections had been put in place but i'm unsure if these are the same protections offered by EMET. ...
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2answers
138 views

RAM Encryption. Is it possible? [duplicate]

Without adding any additional hardware, is RAM encryption possible? If so are there any known and currently used implementations for Linux or Windows systems? And if this is something that is possible ...
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3answers
167 views

How to mitigate heartbleed like attacks prior to zero day

Whenever sensitive data such as a password is used on a server it resides in memory for a short time. Given that security flaws like heartbleed exist which have the ability to 'bleed' memory for their ...
8
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1answer
155 views

How long would a computer have to be off to be resistant to a cold boot attack?

I understand that the longer a computer is off, the more resistant it is to a cold boot attack. I also understand that an AES key can be reconstructed from a redundant round key schedule even after a ...
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5answers
4k views

environment variable accessibility in Linux

Perhaps this is a trivial question, but how accessible are environment variables in Linux between different users? e.g. if Alice executes export FAVORITE_FOOD=`cat /home/alice/fav_food.txt` Can ...
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1answer
127 views

Create memory dump from the windows commandline

I was following this blog post to dump the memory of a windows host. Sadly this method does not work on Windows Server 2012 because the memory drivers that come with mdd aren't signed and this is ...
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1answer
1k views

mprotect at kernel level

What would happen if a kernel-level process sets some of its memory pages as PROT_NONE with mprotect and another kernel-level process tries to read one of these protected pages? What is the ...
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3answers
10k views

Memory dumping Android

I need to evaluate the security of a cryptographic library. In particular I am targeting a part of the library where I believe the private key is exposed for a limited time in the RAM. Any ideas or ...
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1answer
399 views

Convert raw memory dump into a format recognized by volatility

I dumped the RAM of a Windows 7 pc using LiveKd which basicly worked. The memory was dumped but then the convert of the binary dump into "summary format" failed. When I then tried to read the file ...
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1answer
121 views

Memory Mapped Files and AV

Do you know if AVs scans non-persistent memory mapped file content in a Windows Environment ? (Or have the answers for some of the AV on the market) I would prefer, if possible, some real world ...
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42 views

Address of environment variable different for each directory

I'm writing a return-to-libc attack for a school project. My script retrieves the system(), exit() and shell addresses as follows (it's a sh script that calls some c programs): Create the environment ...
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4answers
214 views

Simple tools for searching process memory for MSSQL connection strings

I'm working with a piece of software that handles all permissions in a Windows client binary on the user's computer. The software connects to a backend database using the sa account. The sa password ...
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4answers
7k views

Old OS memory space protection - was it really that bad?

In his book Security Engineering, Anderson really focuses on how in the 90s and early 2000s programs would need to access memory that wasn't their own, and programmers programmed with the assumption ...
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1answer
158 views

How do programs like keepass protect their data even when it's loaded into RAM?

After noticing the feature in Keeppass having the option to "Enable in memory protection" I began wondering, how can memory be encrypted and still be useful? Without going into homomorphic ...
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1answer
290 views

Volatility Plugins Directory Using Windows

I'm trying to use a plugin (not built-in) with volatility 2.4 but am having trouble with the syntax. I know that at least for the native python (vol.py) the plugins option must be specified directly ...
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2answers
111 views

Prevent Plain-Text Passwords Output by a Script From Being Accessible in the Future

Let's say I have a Bash script that generates a password, creates a new user with that password, and then tells me what the password is: # Generate a password and set it to $PASSWORD PASSWORD=$(tr ...
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1answer
431 views

Are encryption keys wiped from RAM before hibernate, or how to do it (Luks and Truecrypt)

Using Linux, I have system and swap/hibernation partitions encrypted with LUKS, and data partitions encrypted with Truecrypt, and I am wondering when I put my laptop to hibernation if the encryption ...
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3answers
377 views

What is risk of having memcache in public interface?

To what extent a hacker can potentially cause harm to a server? Can you please give few examples? Recently, there was a data breach in my website and I found out this interface was public-facing and ...
2
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1answer
100 views

Selling used ram [DDr3 SODIMM]. Need to erase?

Does DDr3 SODIMM memory hold information after being removed? I would like to sell the memory I just removed from my computer, however I wasn't sure if I had to wipe/erase it first some how. Please ...
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1answer
88 views

Defeating ROP attacks in x86

Most defense techniques against ROP revolves around randomization, such as ASLR. If I mark all regions of memory, other than the code segment, non-executable, will this defeat ROP?
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Are there any architectures currently out there that use hardware-enforced process isolation? What would it take to add that to x86?

First-time asker/commenter, long-time reader. As someone who's currently doing a lot of thinking & writing about measures that might foundationally improve computer security (ie., involving not ...