All Questions

4
votes
2answers
274 views

Disable SSLv3 in Dovecot --> TLS handshaking failed: no shared cipher?

Ubuntu 12.04 OpenSSL 1.0.1-4ubuntu5.20 14 Mar 2012 Dovecot 2.0.19 The situation is I'm trying to disable SSLv3 in Dovecot by adding !SSLv3 to the ssl_cipher_list: ssl_cipher_list = ...
1
vote
2answers
120 views

Should email verification be followed by password-based login? Why?

[This is a duplicate, considered off-topic at http://stackoverflow.com/questions/26564992/should-email-verification-be-followed-by-password-based-login-why] A typical account creation process seems ...
1
vote
1answer
30 views

What is the difference between Internal and External scan in PCI

Is each firewall interface IP is considered as external IP?. Do we need to scan each interface IP??. What is an internal scan? What are the elements for internal, how we do it?.
2
votes
0answers
31 views

Why should I persist OAuth 2 access tokens along with refresh token

That's something I've came across in a couple articles about OAuth 2: when it comes to persisting refresh tokens to database some authors prefer to store access token as well, or at least mention it ...
1
vote
1answer
153 views

Is it safe to store public key encrypted password in the Mobile Device for authentication purposes?

I have a Apache Cordova hybrid mobile app that needs to authenticate users, but we don't want to prompt for credentials every time the app is used. Some options came to my mind: Store the password ...
0
votes
1answer
510 views

ShellShock vulnerability and Java Web Applications

I am running a java webapplication ( Spring 3.2 based) on linux hosts. The linux hosts are vulnerable to the ShellShock vulnerability. Can someone exploit this vulnerabiity on my website ?
3
votes
2answers
136 views

Application communication monitoring

I am seeking a way to monitor communication between Android applications in order to detect their suspicious behaviour but I am not sure where to start the development process from. As far I have ...
0
votes
3answers
71 views

What is same site scripting and what are some exploit scenarios?

I know it is an issue with how DNS is configured , but is it really dangerous if the attacker couldn't access your network?
0
votes
0answers
23 views

Rooted android cached password

Assume you could exploit a vulnerability on an old Android 2.2, the questions are: 1- Is there anyway you could see stored passwords on that operating system, specially Facebook password. 2- Can you ...
0
votes
3answers
876 views

PCI prohibit direct outbound connections on EC2

I am using EC2 instances to power our web service that needs to be PCI SAQ-C compliant. I am trying to figure out what point 1.3 of the self assessment really means: 1.3 Does the firewall ...
1
vote
1answer
153 views

What causes a powershell payload to run the first time but not the second?

I created a windows/meterpreter/reverse_https powershell payload using the python script provided at the end of this article. In the first run, the meterpreter session opened successfully, when I ...
0
votes
1answer
85 views

Why is not safe to use the same public key in RSA?

In the RSA context, why is not safe to use the same n (public key)for different people?
0
votes
0answers
73 views

How to decrypt crypt7 files from whatsapp [on hold]

I copied my entire Whatsapp folder from my Android phone onto my computer but I can't figure out how to decrypt the msgstore.db.crypt7 file to just msgstore.db
9
votes
2answers
691 views

ISPs are now adding unique header identifiers to web traffic. Can this be avoided? If so, how?

I'm a security-conscious Verizon user, and it has recently come to light that Verizon is now serving up my web traffic to ad partners while en route. I understand that once my data has left the ...
5
votes
1answer
2k views

ECDHE_RSA and gmail

I'm using Chrome on Ubuntu Linux to connect to Gmail. The connection info says that ECDHE_RSA is used for the https symmetric key exchange. Based on my understanding of TLS and Gmail, my client ...
1
vote
1answer
40 views

Is selecting trusted computer in 2-step verification less secure?

In using 2-step verification, does selecting 'Trusted Computer' a less secure options? https://support.google.com/accounts/answer/2544838?hl=en If so, is it still a reasonably secure option?
0
votes
2answers
119 views

Does WPA2 Enterprise protect against evasdropping from within the network?

At home, I have a simple ISP supplied router where I have set up a WPA2-PSK wireless network for our laptops and other devices. While I played around with Wireshark, I noticed that I could use my ...
0
votes
1answer
89 views

What is attacker trying to do with my server?

Some is trying to access this link (and similar ones) frequently in my site: http://mysite.com/upload/RS=%5EADAJVxZ5NB.GMTgFV3EMEJX3sN22Jw- Note that my server doesn't have an upload folder inside ...
1
vote
1answer
38 views

Read SSL Certs with user process

I am running my own server, on which I have different services (Nginx etc.). All these (internet) services are / should be secured with SSL (offcialy signed). The key files / certificates are located ...
1
vote
2answers
40 views

Using OAuth 2.0 without token storage

I am building a system for a product which requires Authentication and Authorization. Naturally I have chosen using OAuth 2.0 as it is a commonly used protocol and has proven to be useful. I am ...
2
votes
3answers
150 views

Distributed Denial Of Service Attack Mitigation

Is there any way in which you can stop a DDoS attack(or any measure that you can take), if the packets sent by the attacker look like normal traffic? I got the question on an interview (how would you ...
0
votes
2answers
143 views

When MBR pirates grin as an indication of absolute pleasure!

Someone, have no idea who, really worked my computer, and placed some rootkit, all-knowing, all-smashing malware something and I simply cannot keep Windows OS clean in a multiboot configuration with ...
-1
votes
1answer
67 views

Home PC has been compromised remotely and even after cleaning my PC repeatedly, the problem still comes back, help please? [on hold]

I'm a regular guy running two small franchise businesses with a basic understanding of computers etc, (very basic really), but I am certain my home network has been hacked and I am finding lots of new ...
-2
votes
2answers
52 views

Find DES encryption key having input and encrypted output

Having the source string: kenanfx And the generated encrypted string: csund6XMTudO6 Using this script, it identified the algorithm used to encrypt as DES(Unix) I wonder if it is possible (in ...
12
votes
4answers
5k views

Is it generally a bad idea to encrypt database fields?

I work on a tiny company, it's literally me (the programmer) and the owner. The owner has asked me to encrypt several fields in a database to protect the customers data. This is a web application that ...
15
votes
5answers
6k views

SQL field level encryption, how safe is it?

I am considering encrypting my database and/or encrypting only certain columns in a few tables. Is it worth the time? I mean, how much of a burden would it be on someone if they were to get a hold of ...
3
votes
2answers
364 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"])) { ...
2
votes
2answers
72 views

How can one secure Exchange 2010 cookies?

We have received the below finding from an IT audit. Missing Secure Attribute in Encrypted Session(SSL) Cookie: It is best business practice that any cookies that sent over (Set-cookie) an ...
1
vote
1answer
61 views

How to cryptoanalyze a one time pad that uses a plain text document as the pad?

I have read that in order for a one time pad to be truly secure, the pad itself must be random data. Given the practical difficulty of sharing a secure random pad, I was wondering what would be the ...
1
vote
1answer
129 views

Where does /dev/random get its entropy?

I read over and over about how /dev/random gets its entropy from "hardware events." What exactly are these hardware events and how can we be sure that it is random enough?
-1
votes
1answer
85 views

0-Day Overview - Website that shows which current Exploits to protect against? [on hold]

what are the best sites to keep track of what current 0-Day a company with many clients and internet facing servers should protect against? This is no question about how to protect a network (patch, ...
0
votes
1answer
39 views

What could happen if regex metacharacters using named capturing group are not encoded?

Let's say that a web application take a specific input from the user (e.g., search form), apply a Java regex with named caputring groups on it and use the final output to do other stuff (e.g., look ...
3
votes
1answer
70 views

SSD Self Encrypting Drives - Setup / warm boot bypass

I've seen folks deploying the SED on laptops recently. I've discovered that there is a setting in which you can do a warm boot and NOT require the bootup password to be put in again. Which makes ...
4
votes
1answer
82 views

When does an Apple Pay token get converted to a real credit-card

Apple Pay says they store a Token on the phone and use it for transactions. Who issues this token? Who then converts this token to a real credit-card. Where is the mapping from token to real card ...
0
votes
1answer
36 views

User Binding Request with credentials in Lync Dump

I've dumped a call between two lync clients and saw that there were some UDP packets that look like this: Server -> Client 1132 14.495362000 <serverip> <clientip> STUN 146 ...
6
votes
3answers
2k views

Computer sending unstopped ICMP echo request to an IP

I noticed while hanging in Microsoft Network Monitor that my computer is sending ICMP echo request to an arbitrary IP address 202.39.253.11. I looked for the owner of this IP and I found it is owned ...
2
votes
3answers
670 views

Is it possible to force a browser to use http in an ssl enabled (https) website?

I was doing a security research on storing the session id in local storage instead of storing it in cookies. I understand that it is not possible to tag the values in local storage as HttpOnly and so ...
2
votes
1answer
29 views

ecryptfs - relationship between passphrase and sig-cache.txt

I have previously used TrueCrypt for creating encrypted directories on servers. I am now trying ecryptfs due to the end of development announcement in May. I see that when I encrypt a directory and ...
1
vote
1answer
154 views

How can LastPass enforce 2-factor authentication

I've recently started using LastPass and one of the things you can set as a policy for you password vault is Prevent offline access when using Google Authenticator. The local cache can be ...
2
votes
4answers
459 views

MiTM, can a binary file be changed or swapped enroute

I genuinely looked for an answer to this but my terminology is lacking. If an attacker was in a MiTM position running a proxy, wouldn't it be possible for them to detect a binary like an .exe or .pdf ...
1
vote
1answer
110 views

Mentioned On A Blog By A “Hacker” - Should I Care?

Some (insert noun here) who seems to be a black hat hacker thinks that I am his #1 enemy and has posted some of my information on his blog. He is mad because I am advertising for others. The ...
-2
votes
0answers
38 views

What can i do after this step [on hold]

one of my friends gave his site for auditing and lately i found that in his search box i can insert javascript and html tags which will show me the expected results, ex: if i insert <h1> tag it ...
-1
votes
0answers
34 views

How can I modify traffic realtime using MITM technique? [on hold]

I want to create an MITM which parses traffic, but can identify certain packets and trigger a response. I want to be able to toggle the trigger on/off, so that if the client sends a request to the ...
8
votes
4answers
807 views

How bad it is to install another company's root certificate to your server?

Our company uses a web server with a couple of web sites on it (private and public, over HTTP and HTTPS, some low risk and some high risk including online payments or other sensitive data for ...
2
votes
5answers
28k views

How to bypass restrictive mac address filtering on home network (not malicious)

Background A short sketch of my situation before I formulate my question: I am on a large home network, which is privately administered by a couple of admins. The network consists of a lan and a ...
0
votes
0answers
202 views

Is the password “Z” more secure than the password “a”? [duplicate]

Okay, I guess it's not possible to call one-letter-passwords "secure" - so let's compare ZZZZZZZZZZ with aaaaaaaaaa. Both are using the same character pool [A-z], so the number of combinations for a ...
-2
votes
0answers
34 views

What happens behind the screens during an HTTPS connection? [duplicate]

How HTTPS(SSL communication) actually works? I have been reading many questions and answers on this topic but some basic question come up to my mind. 1) When I https to any site say ...
2
votes
2answers
72 views

What are the insecure Protocols in terms of PCI DSS

What are the insecure protocols which should be disabled according to PCI DSS standard. How to check those are disabled in Firewalls and Servers.
1
vote
1answer
119 views

Browser gives access to root directory through “/” [on hold]

If I put a '/' on my browser I have full access of my root directory. I have tried the same thing on another computer and it didn't work. So, I'm trying not to be paranoid but this is too strange. I ...
6
votes
4answers
294 views

My ISP is injecting strange codes to every website I visit

Here's the code at the bottom of every page: <script type="text/javascript">if(self==top){var idc_glo_url = (location.protocol=="https:" ? "https://" : "http://");var idc_glo_r = ...

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