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Linux Getting Harder To Crack
AlanS2002 points out today's article from Iain Thomson on vnu.net, which says that "Linux systems are getting tougher for hackers to crack, security experts have reported today," summarizing "A study conducted by the Honeynet Project has found that it takes about 3 months before a unpatched Linux machine will be owned, compared with about 72 hours in the past. According to a report on the study default installations are now more secure with less services enabled by default, added to this is newer versions of software such as OpenSSH being more secure. Interestingly Solaris 8 and 9 did not fare so well."
I am happy to hear this, as I run a linux box. These reports are mostly moot, however, because a router will deter all but hackers with a reason to pwn your box, and there is little reason to do so to a home computer. My unfirewalled SP1 Windows XP box has faired similarly to my linux box, with just a bit of spyware.
My day job's in a big hosting facility, and it was a surprise when setting up RHEL 3.0 that it had by default quite the restrictive iptables ruleset which let very little besides SSH through, and pam_tally was set up in the install, so 5 login failures locked out the account.
Quite refreshing to see, since I was doing the install for a customer who'd decided to go for a reimaging because their machine had been compromised.
500GB of disk, 5TB of transfer, $5.95/mo
De John Wisniewski - a memorial
The game began at 10 a.m. on Friday. The VMS machine on the Green team was configured with Apache web server. As we are aware, VMS is an extremely secure operating system. While many of the other boxes in the room, mostly Unix, linux, and forms of windows, and even a Macintosh, were compromised and subsequently attended to by their masters, the VMS system remained intact. Here is where a real security issue comes into play.
We were very confident of the VMS box, and a lot of interest was generated by it. In the spirit of spreading the good word and educating the people about VMS, we ended up answering a lot of questions about VMS, and showing how the machine automagically added user accounts, and demonstrated the various terminal games and web pages which had been created. We were also aware that, in this crowd of 5000+ hackers, someone might be able to weasel their way into the machine if any security measures were taken lightly.
As events would have it, we had an issue, which we did not understand, with the operation of the serial port used as the operators' console. At 2:00 a.m. Saturday morning the system manager decided to telnet to the box in order to do some routine checks. Using Telnet in an environment with 5000 hackers on your network is an insecure method of administering a computer system. A lot of people were fascinated by the VMS system, and had asked many questions about it, shoulder-surfing the console operator, who of course answered their questions in this friendly game of an environment.
One of the hackers who had been showing a lot of interest in the VMS box happened to be sniffing packets from the system manager's PC. He discovered the password to the account, a simple procedure any 13 year old kid can pull off with ease after a little social engineering. The hacker logged in, and placed a couple text files (his mark for points) in the manager's user directory, and then notified the system manager in order to claim the points. There were no points for hacking the machine because the files were placed in a user directory instead of the `root' VMS directory. He was awarded 10 points for social engineering.
Was this an instance of VMS being hacked? No, it was just a circumstance where a privileged login session was passed in plaintext over a network with 5000 mechanics, social engineers, and hackers on it. By using a telnet session on an open network, the system managers' login information was freely made available to any who cared to record it. Giving away your login info in this way to a hacker who subsequently uses it does not constitute being hacked, it constitutes an error in security procedure. The thought of improved security, such as some level of encryption for telnet on VMS, immediately comes to mind. Be very afraid.
The Alpha was disconnected from the haxor network, the serial port issue (our fault alone) was fixed, and the network was reconnected. The incident did not repeat, nor did any hack whatsoever of the VMS system take place during the event. The hackers bombarded the box with telnets and ftp attempts to every bizarre port number imaginable, obscure ports in the 40,000 range and more. The word of the early-morning incident had spread, and those seeking glory and a reputation besieged the box.
Another kind of social engineering, involving a clever lie intended to trap those who would think it cool to hack the NOC was presented in this way: People came by, with an IP address, saying, "here is the IP address for the NOC, have fun". It was really an outside IP address, and this was a ruse to make those who listened loose points for attacking sites outside the defcon network. Hacking outside the CTF network was forbidden.
As the game progressed, the goons announced that there were not enough hackers (huh? The tables were *full* of people). To make it more enticing, the point award for placing your mark in the root directory of a server
Well they list it in the list but give no data on it what so ever. So one is to assume FreeBSD was never hacked from the data presented (or lack thereof). Way to go BSD!
i have said it before and i will say it again: only because more and more people stand up to state how superior and ultra-safe linux is, won't necessarily make it so!
...) ...). therefore it is as questionable a time to glorify linux as it will ever be.
if it is indeed true what this study claims then i am the first to applaude the kernel guys and the distribution makers.
but there are facts that won't change:
- software monoculture is BAD (no matter what the monoculture consists of)
- linux is NOT the safest alternative out there (compare *BSD, VMS,
- there have been an alarming number of exploits as well for the kernel itself (local root exploits, anybody) as also many exploits for user land applications (mplayer, mpeg123, mozilla,
SECURITY IS A PROCESS NOT A STATE!
please, dear media (and also dear slashdot), make an effort to educate people in security matters instead of putting some solution on the "security pedestal". don't make claims about the absolute security of any alternative.
the complete solution is what makes and breaks security, not the components, and without adequate, highly trained and proficient personell it will always be near impossible to achieve truly secure (whatever THAT means) solutions.
well, at least the uprising unices make it easier for the proficient and maybe even raise the security bar for the amateurs, but alas this is not an end to itself!
jethr0
When we rolled in Linux to automate our internal business systems, security was at the top of the flag pole for us. Our old systems (AIX) had suffered from numerous repetitive flaws particularly in areas of allowing certain connections and not allowing others, which posed a significant problem when it came to securing the entire network from outside abuse.
We analyzed the various systems available to us at the time we were making the rearchitecture decision, some six months ago or so, and quite rapidly we reached a decision based on the data. That is.. Linux would be more secure in our company because we already have the technical people using Linux outside of work who would be able to already understand the system and be able to fix specific and non-specific security issues themselves rather than having us rely on an outside contractor or vendor. This meant we could buy vanilla beige boxes and install Linux, set up all of our business processes, all without having to go to one of those vendors such as RedHat, Sun, or one of the other many vendors in the Linux field.
So, security is a strong concept of safeness for us, and we're glad we're running Linux.
Interesting study, not all that surprising.
How about a study like this against the varous NAT/routers being used out there? How easy is it to own systems sitting behind those? This appears to be the standard anymore for the millions of cable/dsl connections.
What about client side attacks, such as attacks against web browsers and email clients? These kind of security problems comprise a large portion of attacks against Windows based machines, and with the rising popularity of cheap routers that provide good protection to home users via firewall and NAT rules that will prevent direct attacks against daemons, client side attacks will be rising in popularity over the next few years, and cheaply available firewalls won't do anything to help.
Of course, this kind of analysis would require a more involved approach to testing O/S security, rather than just installing an O/S, throwing it on the internet and sitting back and waiting for whatever randomly happens to it to happen, which doesn't really seem to be the way honeynet likes to operate.
Keep in mind that Honeypots were originally intended to track the behavior of so called blackhats, not to analyze the security of operating systems, and they probbably aren't the best choice for the job.
(The idea being to discourage people from playing at skript-kiddie, but concentrating on the real challenges. Using the above logic, if a box was "practically uncrackable", the incentive should be so great that it becomes almost the sole focus.)
As for Linux, a correctly-configured hardened box should come close to VMS in security. The sorts of things that you could configure to do this are as follows:
The reason for so many steps is that Linux is flexible. Flexibility, if used well, can make for an extremely tough system. If used badly, it can make for a highly vulnerable system. Mistakes are not always easy to catch, so it's better to have enough independent redundancy that a failure isn't catastrophic.
VMS had flaws, too, and could be easily mis-configured. (Being able to put DCL scripts in mail subject lines was plain stupid.) But, again, if set up well, was virtually bullet-proof.
It's a small world and it smells funny; I'd buy another if it wasn't for the money; Take back what I paid (SoM)
Even if the firewall were enabled, this is a pre-SP2 box he was talking about. That still leaves a short window of vulnerability, as Windows XP will bring up the firewall after the networking is set up.
Mart"I know I will be modded down for this": where's the option '-1, Asking for it'?