Items tagged security
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Most infosec bugs are really boring after a while. But processor ones are always crazy and fascinating because processors are basically a hornet’s nest of witchcraft and mayhem stacked on top of each other all the way down.
The Mirai Botnet Was Part of a College Student Minecraft Scheme. Fascinating story about last year’s Mirai botnet, which was originally developed to help corner the Minecraft server market. # 15th December 2017, 3:18 am
Extended Validation is Broken. Ian Carroll spent $100 incorporating a company called “Stripe, Inc” in the state of Kentucky and $77 on an Extended Validation certificate tied to that legal entity. Safari (and Mobile Safari) now hide the URL bar completely, displaying “Stripe, Inc” in its place. “This means the attacker does not even need to register a convincing phishing domain. They can register anything, and Safari will happily cover it with a nice green bar.” # 12th December 2017, 1:36 am
Cybersecurity Campaign Playbook (via) “The information assembled here is for any campaign in any party. It was designed to give you simple, actionable information that will make your campaign’s information more secure from adversaries trying to attack your or-ganization—and our democracy.” # 3rd December 2017, 7:22 pm
TL;DR on the KRACK WPA2 stuff—you can repeatedly resend the 3rd packet in a WPA2 handshake and it’ll reset the key state, which leads to nonce reuse, which leads to trivial decryption with known plaintext. Can be easily leveraged to dump TCP SYN traffic and hijack connections.
Exploding Git Repositories. Kate Murphy describes how git is vulnerable to a similar attack to the XML “billion laughs” recursive entity expansion attack—you can create a tiny git repository that acts as a “git bomb”, expanding 12 root objects to over a billion files using recursive blob references. # 12th October 2017, 7:43 pm
The Absurdly Underestimated Dangers of CSV Injection. This is horrifying. A plain old CSV file intended for import into Excel can embed formulas (a value prefixed with an equals symbol) which can execute system commands—with a big honking security prompt that most people will likely ignore. Even worse: they can embed IMPORTXML() functions that can silently leak data from the rest of the sheet to an external URL—and those will work against Google Sheets as well as Excel. # 10th October 2017, 4:13 am
Is there anyway to game unique link verifications? Like when you get sent a link of the form https:/........com/UID=TYYN04001 How would one change the digits to reproduce another working link?
Not if they’ve been implemented correctly.[... 42 words]
By doing exactly what they’re doing already: adding more sophisticated rate limiting, and preventing users from using common weak passwords.[... 80 words]
Set up full drive encryption—that way if someone steals your laptop they won’t be able to access your data without a password.[... 95 words]
Don’t cleanse. Escape instead.[... 18 words]
I would like to setup a web-server which will be used solely by myself. What would be the safest way to do so in terms of confidentiality of the contents?
I haven’t configured them myself, but it might be worth looking in to client SSL certificates for this. That way your server won’t communicate with any browser that hasn’t installed a certificate which you generate. I believe the BBC used to use this for a lot of their important servers which they wanted to be accessible only by their own developers from across the internet (I don’t know if they still do).[... 108 words]
Input validation is, in my opinion, a red herring. Sure—if you ask the user for an integer or date you should make sure they entered one before attempting to save it anywhere or use it for processing, but injection attacks often involve text fields (e.g. names, or comments posted on Quora) and validating those on input is a recipe for banning “Tim O’Reilly” from ever creating a proper profile on your site![... 316 words]
CSRF: Flash + 307 redirect = Game Over. Here’s the exploit that Django and Rails both just released fixes for. It’s actually a flaw in the Flash player. Flash isn’t meant to be able to make cross-domain HTTP requests with custom HTTP headers unless the crossdomain.xml file on the other domain allows them to, but it turns out a 307 redirect (like a 302, but allows POST data to be forwarded) confuses the Flash player in to not checking the crossdomain.xml on the host it is being redirect to. # 10th February 2011, 10:07 pm
National politics of snoopiness vs corporate ethic of not being evil aren’t directly compatible, and the solution here only works because (let’s face it) Tunisia is not a rising economic force. If you’re selling ads in China, you don’t get to pretend that the Great Firewall of China is a security issue.
The Inside Story of How Facebook Responded to Tunisian Hacks (via) “By January 5, it was clear that an entire country’s worth of passwords were in the process of being stolen right in the midst of the greatest political upheaval in two decades.”—which is why you shouldn’t serve your login form over HTTP even though it POSTs over HTTPS. # 24th January 2011, 6:06 pm
Be very careful when implementing JSON-P for authenticated actions—evil third party sites could assemble URLs to your user’s private data and steal it. This attack has worked against Gmail in the past.[... 203 words]
It’s called the Same Origin Policy, and it’s principally about intranets. Imagine you have a URL http://intranet.corp/top-secret-...—and you then visit http://evil.example.com/ . If cross domain XHR was allowed the evil site could suck that secret document off your intranet without you realising.[... 105 words]
Bleach, HTML sanitizer and auto-linker. HTML sanitisation is notoriously difficult to do correctly, but Bleach (a Python library) looks like an excellent effort. It uses the html5lib parsing library to deal with potentially malformed HTML, uses a whitelist rather than a blacklist and has a neat feature for auto-linking URLs that is aware of the DOM (so it won’t try to auto-link a URL that is already wrapped in a link element). It was written by the Mozilla team for addons.mozilla.org and support.mozilla.org so it should be production ready. # 25th October 2010, 1:32 pm
Firesheep (via) Oh wow. A Firefox extension that makes sniffing for insecured (non-HTTPS) cookie requests on your current WiFi network and logging in as that person a case of clicking a couple of buttons. Always possible of course, but it’s never been made easy before. Private VPNs are about to become a lot more popular. # 25th October 2010, 9:11 am
Probably because if you implement logout as a GET action, I can force you to log out of a site by tricking you in to visiting a page with an <img src="http://yoursite.com/logout/" width="1" height="1"> element on it.[... 64 words]
XSS attacks are common and easy, and crop up all the time. What’s new is that the number of people who are aware of the potential for XSS worms has increased hugely, so when an XSS does crop up in something popular there’s a much higher chance of someone turning it in to a worm (as happened with Twitter the other day).[... 96 words]
Absolutely never. Magic quotes was a badly designed feature, and PHP has been trying to escape its legacy for years. If you are constructing SQL strings using string concatenation you’re asking for trouble—use prepared statements or a library that interpolates and correctly escapes variables for you.[... 65 words]
For security reasons.[... 159 words]