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Questions tagged [backdoor]

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

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29 views

Creating a backdoor in linux [on hold]

How can i create a persistent backdoor on a linux system that i have root access to without being detected? I have looked into two options: To include a script that binds a shell in the /etc/init.d ...
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0answers
30 views

Uploading of backdoor results in the server removing file extensions. Any workaround? [on hold]

I am totally new within the scene of information security, but find it extremely interesting and thus taking a course at my university, where we have to break into a website/webserver. The website is ...
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1answer
41 views

How to find out which application runs behind port 31337?

I found an open port on a "Kartina Quattro" (https://www.kartina.tv/article/247-kartina-quattro). It's a device for watching russian TV channels. The port number is 31337 and the Service is called ...
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1answer
134 views

How could the Chinese Communications Authority find a backdoor on my website?

I host a legacy HTTP website on my own hardware in China. It was attacked due to the Struts file upload flaw last month. But yesterday, Communications Authority in my province alarmed me, there is ...
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0answers
60 views

Meterpreter is failing to load any extension except the core commands

[*] Starting persistent handler(s)... msf5 > use exploit/multi/handler msf5 exploit(multi/handler) > set PAYLOAD windows/meterpreter/reverse_https PAYLOAD => windows/meterpreter/reverse_https ...
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1answer
731 views

ShadowHammer: Limited to Windows?

I've been reading about ShadowHammer over the last couple of days: Kaspersky researchers estimated half a million Windows machines received the malicious backdoor via ASUS' update server. But the ...
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0answers
58 views

Maintaining persistence in my own reverse shell

In my attempt at learning more about how backdoors like meterpreter work, I have written a reverse shell in C++ for linux. To achieve persistence, I tried looking into meterpreter's source code which ...
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1answer
122 views

What can be done to defend against acoustic keyboard evesdroping?

It is reasonably well established that it is possible to determine what one is typing based on keyboard sounds, and the difference between different keys (source). This provides a significant issue to ...
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1answer
95 views

What features would you use to detect a backdoor or a bot installation?

I was reading a document about logging and analysis. The document talks about statistical analysis and machine learning techniques to detect some attack scenarios. For instance, If you want to detect ...
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2answers
100 views

How can I ensure that I can trust to OS?

How can I ensure that some OS can be trusted? I'm not speaking about possible security problems which can happen everywhere but about something like a backdoor left by a developer. Can such a thing ...
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3answers
278 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 ...
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0answers
33 views

What guidelines can I follow to know if I can trust a software editor?

At work or at home, I often find some useful piece of software. Sometimes I may find it on a forum, mentioned on a video, or by talking to a colleague. But how do I know if the editor of the software ...
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2answers
89 views

Security and thumb drive [duplicate]

If my laptop is locked, can a thumb drive be able to still infect my computer, or create a backdoor, or any other security risk if it's plugged into it. If so what are some example
175
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11answers
30k 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 ...
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4answers
259 views

Is there a standard for labeling a vulnerability as an intentional backdoor?

US concerns of intentional vulnerabilities placed in foreign manufactured equipment has lit up headlines. Is there a standard that sorts (differentiates) poor-designs from intentionally placed ...
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2answers
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 ...
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1answer
114 views

Where can I report a program to be reviewed for security vulnerabilities and privacy issues?

After looking for software to store information, I found a program that caught my attention instantly. I purchased a license but after a while, I realized that the program had a big vulnerability. On ...
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2answers
358 views

How do persistent reverse shells and other malware gain their persistancy?

I heard about persistent reverse shells, and how in theory, they can stay indefinitely on the target's system, and how they can connect back to the host when the target's machine boots up, but how do ...
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1answer
82 views

Sending a executable that use LD_PRELOAD to modify fopen and create a backdoor

I follow the article Hooking libc using Go shared libraries to create the following code: package main import ( "C" "bufio" "log" "net" "net/textproto" "os/exec" "...
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1answer
124 views

U2F devices: backdoors possible?

Following the recent post at ZDNet on Google Titan devices designed and manufactured by a Chinese vendor and potentially prone to built-in backdoors: is it even theoretically possible to inject a ...
2
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1answer
47 views

Vulnerabilities of IT system due to hardware?

Is there any relation between specific hardware (like specific kind of CPU etc) or laptop manufacturing brands and the hacked environments run on? Can this be measured in any way like stolen data or ...
0
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1answer
249 views

Do vendors put backdoors on network devices?

There are several articles that says that vendors plant backdoors on network devices intentionally, such as this one. They found backdoors that were made by the vendors. Also, I read somewhere else ...
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1answer
450 views

Privacy implications of Intel CPU backdoors [closed]

I didn't follow all the episodes about backdoors in Intel CPUs What can intelligence or law enforcement agencies potentially do on a computer equipped with a vulnerable Intel CPU (connected to the ...
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1answer
525 views

How could a hacker access my Wordpress admin area?

I have two sites which appear to have been hacked. I checked the access logs and found these log entries: "GET / HTTP/1.1" 200 20213 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:47.0) Gecko/...
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1answer
2k views

Find the security hole on my site and prevent it [duplicate]

Last day I've noticed that my wordpress site is hacked and a PHP backdoor shell is installed on my site. Virus scanner reported that a plugin file is inside my wp-content/uploads which I did not ...
4
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2answers
360 views

How can Linux be secure if it allows for open source contributions from the public?

From my brief understanding of Linux, developers from around the globe submit code to be included into a Linux update. It's then reviewed by security administrators. When approved, it's passed onto ...
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1answer
438 views

Metasploit: Executables are not working after Reverse Shell

I tried connecting to a windows box and create a reverse shell back to my Kali Linux machine. Reverse shell is created and I get the meterpreter prompt. Commands Used: Payload: windows/shell/...
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1answer
231 views

protection from Backdoor hacks from disgruntled developer/ employee

I created a ecommerce site with a developer. He completed almost all his work but in the end we had some financial disagreements so our partnership ended in a bitter dispute. That developer threatened ...
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1answer
494 views

proftpd backdoor not backdoored

I wanted to practice exploiting system using proftpd backdoor. I use the exploit proftpd_133c_backdoor and the payload reverse_perl.I learned on how to exploit using this link, https://www.youtube.com/...
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2answers
62 views

Strength Blowfish and DES with current quantic computing and mandating backdoors

What is the strength of algorithms such as DES (Rijndael) and Blowfish used in password manager Safe password, with the current development (2018) of quantum computing, the former parallel processing, ...
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3answers
1k views

How to protect against backdoors in routers?

Recently, I started looking for a wireless router. Before considering specific products, I looked up some general information about different brands offering such routers. To my dismay, I learned that ...
2
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2answers
252 views

How might one verify that the POWER9 CPU does not contain an AMT-style subsystem?

Given that the IBM POWER9 CPU doesn't appear contain an AMT subsystem (like those seen in Intel and AMD CPUs), is there any way the absense of such a backdoor could be audited? For example, might a ...
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1answer
201 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-...
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1answer
130 views

Are there known incidents of Linux malware coming from unofficial repositories?

Often there is a need to use unofficial Linux software repositories (e.g. media codecs, wireless card drivers etc.) and hence the need to decide whether to trust them. I am trying to figure out how ...
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1answer
247 views

Is INTEL-SA-00075 Detection and Mitigation Tool enough to mitigate IntelME attacks

Is that tool enough to mitigate/protect againts IntelME vulnerability? https://downloadcenter.intel.com/download/26755?v=t If it's not enough I more I can do to protect againts IntelME attacks ?
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0answers
130 views

Flash Descriptor write-protection defaults

According to Intel in this article, to exploit Intel SA 00086 an attacker needs physical access if Flash Descriptor write protections are enabled. I assembled my computer myself, and it doesn't look ...
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1answer
323 views

PHP Backdoor on live server [duplicate]

Suddenly one of our Wordpress websites started sending spam emails and it was blacklisted on MXToolBox. So with the server support I scaned the files and found a strange file called timer.php ...
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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 ...
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1answer
2k views

How secure (about spyware/backdoor in it) is LibreOffice? Should i start using OpenOffice?

I'm using LibreOffice now, and I'm encrypting files of LO Write with VeraCrypt that have very personal content and I want to keep it secret. But I read about LO send to his web SO MUCH information, ...
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1answer
325 views

How does this backdoor work?

I just found that one of my wordpress websites included backdoor (my guess). As I see now, the same file on server is different than original on my laptop drive. So I think my website is already ...
14
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1answer
4k views

How can anyone access Intel's “backdoor OS”, MINIX?

I've read that all recent Intel-based machines include a secret MINIX-based OS, and that it even includes its own web-server. How does one access this OS's services from the main OS? Its purpose ...
3
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1answer
104 views

Can back doors be reasonably well hidden in end-to-end encrypted communication?

Supposing governments can hold secrets and no rogue employees exist, can a back door in an end-to-end communication protocol be kept secret and not be abused by criminals as well, as often supposed? ...
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2answers
1k 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 ...
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2answers
225 views

Would one consider the breaking of Enigma in WWII to be an early example of a backdoor?

In a recent discussion re Tory Minister and British Home Secretary Amber Rudd's insistence that WhatsApp install a backdoor for government monitoring of encrypted data, I brought up Enigma as an early ...
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3answers
4k views

How would a backdoor gain persistence

I know that if you were to gain access to a system and restart it, an implanted backdoor would be killed. Or if you were to locate the backdoor in task manager you would be able to kill it. However, I'...
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0answers
47 views

Secure deployment of xpdf on production

I have an application, which needs the functionality of converting PDF documents to text documents, and then parse them to retrieve information. I am using xpdf utility pdftotext to achieve that. I ...
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2answers
290 views

Is the site wrong about an ethical hacking question or am I?

Can you let me know if this site is crazy? or am I?
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1answer
821 views

Is Intel i3 CPU affected by the Intel ME vulnerability?

Hello I have an Intel® Core™ i3-2328M CPU @ 2.20GHz computer processor (I think Sandy Bridge). https://ark.intel.com/products/70927/Intel-Core-i3-2328M-Processor-3M-Cache-2_20-GHz I have heard about ...
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0answers
866 views

Is there a list of new laptops without Intel Management Engine built in? [closed]

Is there a list of new laptops without Intel Management Engine built in? I'm reading about Intel Management Engine as being a secret backdoor for hackers. (See, https://www.eff.org/deeplinks/2017/05/...
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2answers
1k views

Hardware / firmware backdoors : TPM as a security risk - How to turn it into security advantage?

--- Question: What are the exact risks of using TPM 2.0 or owning this integrated chip? In what circumstances? What are the solutions to minimize risks? Details: My primary goal was to try to find ...