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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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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
41 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
57 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
149 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
64 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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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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1answer
734 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
59 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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4answers
2k views

Unauthenticated packages in debian

Yesterday I updated my debian server using: apt-get update && apt-get upgrade I received message that some of the packages cannot be authenticated being in a rush I hit yes to install ...
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4answers
260 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 ...
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 ...
2
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1answer
123 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
96 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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4answers
3k views

What is the difference between a backdoor and a rootkit?

I was reading the "What is a rootkit ?" post and I'm confused about the difference between a rootkit and a backdoor. As I understood it, both : Are a piece of code written by the attacker and ...
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3answers
279 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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3answers
20k 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 ...
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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
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2answers
747 views

can a backdoor executable be used on an occupied port?

Suppose I am doing a penetration test on a network that has a firewall that blocks all ports except 80, 110, and 443. I want to use a metasploit reverse-TCP backdoor executable written in msfpayload ...
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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 ...
5
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2answers
8k views

Finding a backdoor on a server?

Let's say I hire someone (freelance), for IT work on an Ubuntu server. The server has a good firewall, I run clamav, chkrootkit & rkhunter scans weekly, and I try to keep good practices. The ...
9
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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 ...
2
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2answers
365 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 ...
1
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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 ...
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2answers
962 views

How to leave a backdoor in a Laravel application?

I'm pretty curious how someone could leave a backdoor in a Laravel application? In my opinion there isn't a way, because the entry point of the requests is a route file, and you have to write code for ...
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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 ...
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1answer
456 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
250 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 ...
2
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1answer
526 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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2answers
254 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
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 ...
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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
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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2answers
839 views

Password protection for NetCat shell?

As a pentester, I often use NetCat, and its encrypted counterpart CryptCat. However, even CryptCat only encrypts the traffic. I'm looking for a way to keep unauthorized users from gaining access to ...
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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
496 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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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 ?
76
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9answers
20k views

Is it theoretically possible to deploy backdoors on ports higher than 65535?

Assuming you were able to modify the OS/firmware/device for server/client to send and listen on ports higher than 65535, could it be possible to plant a backdoor and have it listen on, say, port 70000?...
4
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1answer
739 views

Persistent back door using Netcat

I have found the following command several times in one of the linux servers during an assessment: nc -l -p 3030 -e /bin/bash This enables a hacker to gain control over this sever via bash. By ...
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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 ...
4
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5answers
608 views

What is the security flaw in this example of “magic parameters”?

I am reading OWASP Testing Guide v3: Example 1: Magic Parameters Imagine a simple web application that accepts a name-value pair of “magic” and then the value. For simplicity, the GET request ...
3
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1answer
202 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-...
46
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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 ...
3
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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 ...
16
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10answers
6k views

Would an encryption scheme that generates an extra key to be securely stored offsite be a safe backdoor?

Let me be clear first and foremost: I do not think installing a backdoor in security algorithms is a good idea. They undermine the trust in the software and in the company that provides the service. ...
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 ...