Defense is the use of security countermeasures to protect the integrity of the information assets in an IT system and/or infrastructure.

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Firewall best practice

I have to implement a firewall on a Mikrotik RouterBoard. What is a good way to do it? Here is my plan: Note: We are using an OpenVPN (bridge mode) server, a DHCP server, a PPPOE client, and an NTP ...
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1answer
26 views

Method/program for editing secure files

I'm not entirely sure if this is on-topic for Security.SE, but it doesn't seem entirely off-topic either, so I'll try. :) I keep a couple of (GPG-)encrypted files with more-or-less sensitive ...
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1answer
48 views

A clear definition for procedural security controls? [closed]

Can you please provide a clear definition for procedural security controls? Are operational and procedural security controls synonyms? Thanks
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2answers
109 views

What is the current best practice to secure an executive's laptop?

What is the current best practice to secure an executive's laptop? The exec will be processing highly sensitive documents (high-value bids, merger & acquisition info, technical specs). As such ...
2
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3answers
155 views

OWASP escaping recommendation - why /?

In OWASP recommendations regarding escaping untrusted input for HTML element content, they list the following: & --> &amp; < --> &lt; > --> &gt; " --> &quot; ' ...
2
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1answer
118 views

Localhost WebSocket defense

If a malicious application has found its way onto a computer running a localhost only WebSocket server, would it help if the communications used SSL? If so, how could SSL fail if a malicious app ...
3
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2answers
284 views

Anti-DoS WebSockets Best Practices

What are the best practices for thwarting DoS attacks for a WebSocket server? Is there a comprehensive site or document that can be referenced?
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1answer
71 views

Ideal cryptocurrency digital signature

What are the characteristics of the ideal digital signature for cryptocurrency transaction verification? The reason I ask is because this answer about bitcoin signatures describes a potential ...
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1answer
181 views

List of social engineering hacks and defenses [closed]

Sorry if this question is absolutely stupid or irrelevant, but I can't help but ask. I am just curious about different approaches hackers take in social engineering attacks, and clever examples of ...
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2answers
196 views

Defend against HTTP fingerprinting [closed]

I'm looking for ways to defend against common fingerprinting techniques used by hackers to identify what kind of setup my website is running on. I understand this is a complicated topic, and every ...
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1answer
536 views

Why Qualys SSL Server Test is giving me 80 and not 100 in Key Exchange?

My openssl ciphers -v 'CIPHER' output is the following: ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA ...
3
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2answers
239 views

Is it true, that using symetric encryption, if attacker knows encrypted text, original message, and algorithm means he can calculate the secret?

I am a newbie in the security field, so sorry for the naive question. In my understanding, using symetric encryption, if attacker knows encrypted text, original message, and algorithm means he can ...
9
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1answer
511 views

Do any Exchange hardening guidelines recommend disabling OWA Webready? Should they?

For the fourth time in over a year, Exchange OWA has put our internal network at risk due to a remote code execution flaw that exists on the server runtime. This risk is compounded by the fact ...
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4answers
906 views

How effective are anti-virus products against real-world threats?

In a recent interview† with Dave Kennedy, he in passing pegged the average effectiveness of anti-virus products as detecting approximately 3% to 5% of current active threats. While AV comparisons ...
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4answers
1k views

Is it better to choose a single vendor or multiple vendors

A discussion came up at work recently and a debate ensued regarding choosing a vendor. Several people were of the opinion that it is smarter and easier to choose a single security vendor for all our ...
5
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1answer
143 views

CSRF protection - 'back pages'

OWASP suggests that when implementing CSRF protection any attempt to go 'Back' in the browser will cause issues as Interaction with this previous page will result in a CSRF false positive security ...
5
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2answers
859 views

When, exactly, should old password reset tokens be deleted?

I'm trying to figure out best practices for working with password reset tokens. Say a user initiates the password reset process and the are emailed the reset token and we store a hashed copy in the ...
4
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4answers
919 views

Database hardening techniques

So as I understand it database hardening is a process in which you remove the vulnerabilities that result from lax con-figuration options. This can sometimes compensate for exploitable vendor bugs. ...
6
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2answers
145 views

Are temporary blocks sufficient response to network probes?

We have the option of using an automatic blocking feature of our firewall to temporarily block the source IPs of network probes. It is fast and automatic, and it expires after a set amount of time. ...
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2answers
110 views

Which hard disk encryptions schemes are tied to the original hardware?

When using a laptop, an encrypted HD/SSD can be an important security measure. However, laptops are prone to accidents (fluid spills, dropping on the floor, etc) that may mandate some or all of the ...
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1answer
714 views

Have any viruses leveraging the GPU been discovered in the wild? What is the mitigation?

This news article from 2010 discusses how a GPU can be used by a virus to avoid detection by common anti-malware/anti-virus software. The idea is to obfuscate the virus payload and leverage the GPU's ...
3
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1answer
232 views

Can TLS Compression be enabled on 3rd party CDN sites that have no authentication?

In this answer, @Thomas Pornin talks about remediating the CRIME attack and says: (It is a shame to have to remove SSL compression, because it is very useful to lower bandwidth requirements, ...
2
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3answers
117 views

How to tell what viruses are covered by your anti-virus software

One of our corporate twitter accounts recently started sending out DMs to its followers. Looking at the content of these it seems we'd become infected with Troj/Mdrop-EML. All computers on our ...
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2answers
273 views

Practical ways to protect against Cyber Pearl Harbor? [closed]

What practical methods should citizens be using to protect themselves against, and reduce the impact of an attack against critical national infrastructure A lot of recent news about critical network ...
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7answers
762 views

How does formal verification guarantee secure, error-free code?

I've read that code is formally verified by constructing a mathematical model of the code, and then a formal proof is provided to demonstrate that this model meets certain requirements. How does ...
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5answers
451 views

How to prevent pay per show/click abuse?

We have a webapp. 3rd party websites put our banners on their pages (banner is a snippet of HTML). They are paid for it using "Pay per click" or "Pay per show" methods. So 3rd party website's owners ...
185
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3answers
41k views

CRIME - How to beat the BEAST successor?

With the advent of CRIME, BEAST's successor, what possible protection is available for an individual and/or system owner in order to protect themselves and their users against this new attack on TLS?
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3answers
1k views

What can a hacker do when he has physical access to a system?

I mean, I'm a tech guy here in my region (not a hacker...). When I sit in the front of another person's PC, I notice a little fear about what I can do in the system. It's obvious that I will not ...
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2answers
174 views

Most secure response for a server to return to a user scanning for exploits

I have ASP.NET servers hosted in IIS, regularly i see bots attempting to scan my server searching for outdated versions of phpMyAdmin, mysql etc. Currently these requests all return 404 because ...
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8answers
33k views

What can a hacker do with an IP address?

I have an internet connection with a static IP address. Almost all staff in my office know this IP address. Should I take any extra care to protect myself from hackers?
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4answers
346 views

Automating Social Engineering Prevention

Being an advocate for DIO (defensive information operations), I have always been concerned about social engineering and its relation to server security. Giving administrative access to staff members ...
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2answers
410 views

Application of Bayesian network for Web Application Security

How can a Bayesian network be used to perform attack analysis of web traffic? I read an interesting article on its application. "Web Application Defense with Bayesian Attack Analysis" but I was not ...
4
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1answer
884 views

How to detect cookie stuffing attacks?

So the question is how to detect cookie stuffing attacks and how to protect against them? In case of image-based cookie stuffing I can detect that related resources are not loaded and therefore ...
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1answer
341 views

Are there any security issues with importing mail via POP/IMAP?

I'd want to design import mail functionality for an email provider. The process is: user enters email and password for another service at my site and then site accesses another email provider and ...
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3answers
372 views

How would one make a network resistant to the unknown?

I play in a game which includes normal risks, but also a wide range of supernatural powers which could affect the security of a network. These may be as prosaic as a retrieving data directly from a ...
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1answer
336 views

What are some good ways to secure personal computers

I see that many topics here are related to securing data, equipment at an enterprise level. Good advice includes stuff like blocking all unused ports, allowing only whitelisted traffic and installing ...
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1answer
156 views

What does Bluffdale mean for privacy?

I posted a question related to tracing webserver attacks over here and the responses got me google-ing. My understanding has always been that privacy is dead and that essentially there's always ...
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3answers
155 views

A way to secure hyperlinks on websites

How do you think could we secure hyperlinks pasted by users on website's forums, comments, blogs against bad links/leading to malware etc.? I thought about google safe browsing, projecthoneypot. Did ...
3
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2answers
872 views

How to use attack trees and attack graphs

I am trying to understand how attack trees\graphs can be used in the security process. I read a lot of papers presenting the topic and how this reppresentation can be useful, but I really don't ...
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3answers
325 views

What to do when asked for a weak password

The guys who made the security for my country's state bank are completely nuts in all senses. Their internet banking password must be between 8 and 10 characters, and contain only letters and digits. ...
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1answer
804 views

Hadoop security, isolation, and hardening

This is a multiple part question, which all really come back to the main question: How best to protect data in a Hadoop (wikipedia) cluster. (Current version, vanilla main-branch distro - ...
6
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5answers
3k views

Is the US military secret network SIPRNet physically or cryptographicaly separated/secured?

I've read the Wikipedia articles on SIPRNet and NIPRNet (which are pretty light on details) and they are supposed to be considered separate. At the network level, are they technologically ...
3
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3answers
1k views

Privilege Escalation Ubuntu

I am trying to learn how an attacker can escalate privileges in Ubuntu 10.04. I have heard that this can be done but no one has ever said how to do it. The best defense is knowing how it is done and ...
15
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1answer
2k views

Guidance for implementors of HTTPS-only sites (Server side)

The recent trend in HTTPS attacks is to attack the HTTP protocol. What should I do to increase my site's security if the only protocol I want is HTTPS? Some easy to implement ideas are Implement ...
51
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15answers
2k views

Why do law-abiding citizens need strong security?

The layman's counter-argument I run in to for any complaint about inadequate security seems to always take the form: You don't need security if you aren't doing something illegal. This kind of ...
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8answers
977 views

Randomizing MAC addresses on bootup

Since it is possible to set custom MAC addresses, wouldn't it make sense to have a new one as often as possible/convenient (i.e. on bootup)? It would seem that is useful to both attacker and victim ...
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5answers
276 views

Is there something similar to DNSBL's for protecting against forceful browsing?

I want to protect a couple of Apache webservers against forceful browsing. Lately there have been multiple scans querying for non-existent applications on them like phpMyAdmin, notably known for their ...
21
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3answers
1k views

NoScript: How to determine which sites/scripts to whitelist?

NoScript is a great plug-in, both for security and for ad blocking. However, I've found it's not always easy to figure out what scripts need to be permitted on certain pages, to be able to use the ...
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2answers
3k views

Recommend Keylogger for Ubuntu?

I purchased a new laptop recently, and I'm working on hardening it. Specifically, I'm interested in increasing my chances of recovering the machine in the event that it's ever stolen. The system ...
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4answers
458 views

What kind of IT security applications do you guys run on your laptop/desktop?

I know a lot of people run different security applications on their laptops/desktops. I use Little Snitch on my Macbook Pro. I like to know where my applications are sending data and where I am ...