Questions tagged [backdoor]

A backdoor is a method of bypassing normal authentication, securing illegal remote access to a computer while attempting to remain undetected.

166
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6answers
21k views

Apple's open letter - they can't or won't backdoor iOS?

Apple released an open letter to the public outlining their reasons for not complying with the FBI's demands to modify the iPhone's security mechanism. Here's a summary: The FBI has an iPhone in ...
26
votes
1answer
16k views

Is this a backdoor?

I found the code below on my customers site. It looks like a typical backdoor hidden with hexadecimal, but I'm not 100% sure. <?php if(!isset($GLOBALS["\x61\156\x75\156\x61"])) { $ua=strtolower($...
70
votes
6answers
51k views

How do large companies protect their source code?

I recently read the canonical answer of our ursine overlord to the question on How do certification authorities store their private root keys? I then just had to ask myself: How do large companies (e....
29
votes
1answer
16k views

Consequences of tampered /etc/ssh/moduli

What are the consequences if an attacker is able to modify the /etc/ssh/moduli file?
14
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3answers
2k views

Why can't apple simply add the backdoor now and then remove it after the FBI is done?

Summary of the current situation by @TTT Apple released an open letter to the public outlining their reasons for not complying with the FBI's demands to modify the iPhone's security mechanism. ...
91
votes
7answers
5k views

How do I know a piece of software only does what the author claims?

Without being a programmer or a computer expert, how can I know if a particular program or any piece of software in general doesn't have hidden unwanted functions compromising privacy and security?
46
votes
1answer
4k views

Can the previewable option in file managers execute malware?

I am using Nemo file manager and I enabled the Previewable files option that shows video/photo files with their thumbnails: I don't know exactly how files managers generate thumbnails, but I am ...
5
votes
3answers
1k views

BadUSB: Why are firmware writeable in the first place? Manufacturer's backdoor?

How many of you have actually updated their mouse, keyboard or USB stick firmware? How many vendor actually propose updates for such devices? However these devices firmware often offer a proprietary ...
1
vote
3answers
305 views

Ken Thompson's compiler hack

I have gone through Ken Thompson's compiler hack paper; can't we just go through the compiler's source code and check for any backdoor, what was the article's point? Can we be sure that there are no ...
183
votes
11answers
31k views

Search for military installed backdoors on laptop

My laptop was confiscated by the military institute of my country and they made me to give them all my passwords (I cannot tell you the name of my country). They did not give it back to me for one ...
16
votes
3answers
21k views

Detecting and removing Absolute persistance technology

Absolute persistance technology amounts to a persistent rootkit pre-installed by many device manufacturers (Acer, Asus, Dell, HP, Lenovo, Samsung, Toshiba, etc) to facilitate LoJack for laptops, and ...
28
votes
5answers
5k views

What can I do about the Intel Management Engine?

I recently read about the Intel ME (Management Engine), which is a special area in new Intel processors that has complete control over the computer. Nobody knows exactly what it contains, and there ...
6
votes
1answer
566 views

Firmware Backdoor Protection

http://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interface#Security_Risk Ubuntu Linux founder Mark Shuttleworth has likened ACPI to Trojan horses.[28] He has described proprietary ...
9
votes
3answers
2k views

Is it possible to examine a Huawei device to answer definitively whether or not there is a security risk?

There has been a lot of news lately, and in the last few years, about Huawei being a security risk. Can someone explain what the basis is for the risk, other than speculation? Is there not a way to ...
9
votes
2answers
2k views

Are (Intel) chipsets spying on us?

I had a conversation yesterday where someone claimed that I should only use (Intel) computers from before 2006. This was allegedly because after this, software has been embedded in the chipsets that ...
3
votes
1answer
213 views

Are IBM PowerPC CPUs free of the AMT issue seen with AMD and Intel?

Given the privacy and security risks associated with Intel's Management Engine and AMD's Platform Security Processor, are IBM PowerPC processors such as the POWER9 susceptible to similar hardware-...
4
votes
1answer
468 views

Can a running interpreted program cryptographically prove it is the same as as a published source code version?

Can a running interpreted program, for example in languages like python, javascript, ruby, java or php, cryptographically prove that it is the same as a published source code version in a way that ...
3
votes
1answer
3k views

Could someone help me deobfuscate this malicious script code [duplicate]

Two months ago one of our Wordpress sites was infested through and through. This was at the same time I started working at this company. Our main platform is Plone, but I guess they did some on the ...
1
vote
1answer
4k views

What kind of backdoor can be made after hacking wi-fi? [closed]

I'm interested to know if A hacks B's wifi password, what can A do to gain persistent access to the router even after B changes the wifi password? Secondly, how can we detect the backdoor and patch it?...
4
votes
2answers
310 views

Purely as a technical matter, is it possible to make otherwise-strong encryption implemetations that contain governmental backdoors?

So to be clear right-off-the-bat: I think re-designing modern encryption to include governmental "backdoors" is, on balance, a quite bad idea, for any number of good reasons. Nor (FWIW) do I actually ...
4
votes
2answers
238 views

Securing the bootloader

When using full disk encryption the bootloader is not encrypted thus allowing attacks like the Evil Maid. My question is how can I secure myself from this? Can I encrypt the drive or store it in a ...