Battery for Apple 13 inch MacBook Air
|4.7.2017||Posted by Zdziarski under Blogy a osobní weby|
The attackers uploaded a malware file on Classic Shell page which was downloaded approximately 300 times. We removed the file in several minutes and we changed all passwords for all services we had.They were greedy meaning that they targeted the largest projects listed on FossHub: Audacity and Classic Shell. We reacted promptly for Audacity installer but for Classic Shell, several hundred users were able to download the malware infected version.Several hours later, we noticed the attackers were able to gain access through an FTP account and we decided to shut down the main server immediately to prevent any further infection/damage.We are currently in the process of reinstalling everything, change all access rights, passwords and run up under new security rules. I would like to say that we “apologize” but I would lie not to admit it is the worst day ever for me (personally) and all FossHub team members.Classic Shell developer Ivo Beltchev is advising anyone unsure of their downloads to check for the security certificate: the authentic version will show Beltchev as a verified publisher, while the malicious build will show up in Windows as coming from an unknown publisher.Team Audacity, meanwhile, said: "For about 3 hours on August 2, 2016, our download server was serving a hacked copy of Audacity that contained malware. This was due to hackers obtaining the password of one of our developers and using it to upload the malware.
"We are a community of developers, documentation writers, support and help people, not a commercial outfit with a dedicated security team with strong security protocols."We did not have the right safeguards in place, namely, to monitor external files. We clearly have not been vigilant enough. Over the next few weeks we will be working to become a safer, more secure organization." If we have internet-facing web servers (and other types of server, for that matter) we care about how vulnerable they are to attack. There are loads of services out there that you can use to probe your public-facing systems, and they’ll tell you loads of useful stuff about why they might be vulnerable. But of course they’re only useful if you understand what on Earth the probe service is telling you.We’re going to take a canter through the five flaws that are generally considered the most important in the world of internet-facing servers, courtesy of the most recent list from the Open Web Application Security Project, better known as OWASP, explain what each of them actually means, and point at how you can protect yourself.There are various types of “injection” attack – the one I see most is the SQL injection. These attacks happen when you’ve been sloppy (or you’ve failed to realise how defensive you ought to have been) in writing the code that sits behind your website and interprets what’s sent to it from forms and the like.
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Imagine you run a directory services website; the user enters a surname and your back-end code searched for that name and returned the results using a simple query. Imagine we’d entered the name “Smith”, and it capitalised the string, pulled it into the query and ran it:Perfectly valid query to many databases – multiple queries strung together separated by semicolons will be executed in turn. So as long as there’s a table called “users”, this will try to delete it. The intruder won’t care about what the SELECTs do – just that the query set is valid and doesn’t get thrown out by the parser so that the DELETE gets executed.Injection attacks are easy to mitigate: most Web programming systems have functions that will sanitise input strings (e.g. by converting, a ‘ into a double “ so it’s guaranteed to be treated as a data character instead of being allowed to form part of a command), and if your database allows parameterised queries then use that too. And don’t run the database connection under a user ID that has permission to delete stuff it shouldn’t. So long as the raw string can’t get executed by the database, you’re good. (Incidentally, this string conversion is called “escaping” the special characters such as quotation marks. Ask Mr. Google about “escaping SQL strings” and he’ll elaborate for you).
If your website has a mechanism for users to log in in order to access some of the content, you’ll probably use some kind of “session ID” that gets passed between the browser and the server. When the user logs in the server issues a unique session ID, and the browser passes that in with every subsequent request. Often the ID will be passed in the query itself:That’s fine in principle, but you need to be careful at the server end. You’ll usually have a table in your site’s back-end database recording current session IDs, and will remove a session when the user hits the “Log out” button. But if they just quit the browser instead of logging out, someone else could fire it up later and land right back in their session if the session is still considered current at the server end.There’s no hard and fast solution (which is why you often see big notices saying “MAKE SURE YOU LOG OUT IF YOU’RE ON A PUBLIC PC” on sites) but you can at the very least have a function that throws away sessions after a few minutes of disuse. This doesn’t help if the illicit user gets in quickly, but it’s a start.I’m surprised this wasn’t number 1 in the OWASP list as it’s the one I see most, but at least it’s in the top five. The “cross site” bit is all about the attacker being able to inject something into a particular site that causes innocent users unwittingly to access a different site.
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