But, Before you Freak Out! Run this Command in a Terminal Window, to see what Kernel you are running now. Use "su" or "sudo" if needed to get "root" privileges, if needed. Then run this comand...
The “uname” command stands for (Unix Name), print detailed information about the machine name, Operating System and Kernel. Example, below...
root@tecmint:~# uname -a Linux tecmint 3.8.0-19-generic #30-Ubuntu SMP Wed May 1 16:36:13 UTC 2013 i686 i686 i686 GNU/Linux See More Linux Terminal Commands here... http://www.tecmint.com/useful-linux-commands-for-newbies/
Critical Linux Exploit In The Wild
by Jon Buys - May. 16, 2013Comments (0)
If you run servers that provide shell accounts, it’s time to take some preventive measures. At least it is if you are running kernel versions 2.6.37 to 3.8.8, or if you are running RHEL 6 or a clone like CentOS, then the bug was backported to 2.6.32. I ran the exploit myself in a test environment, and it works exactly as expected. Log in as a normal user, compile 100 or so lines of C code, run the executable and you’ve got a root shell. Scary stuff if you manage public shell accounts.
If the exploit is combined with compromising a daemon to gain restricted shell access, the attacker could use this code to remotely gain root access. I can generally get by reading C, but I have to admit that the exploit code is over my head. I can tell from the last two lines that the code sets the uid to zero (root), and returns a new /bin/bash shell. Packet Storm has the entire file available for examination.
This Red Hat Bugzilla thread has several good suggestions for mitigating the risk of your servers being compromized, and given the public attention this bug is now recieving, I expect a fix in the mainstream repositories to show up soon. However, it appears that the bug has existed since 2010, so this raises some important questions. If the bug has been in shipping code for nearly three years, how many servers have already been compromized? Can the full extent of the exploit be calculated? How can we take measures to avoid issues like this in the future?
Critical Linux Exploit In The Wild by Jon Buys - May 16, 2013
Critical Linux Exploit In The Wild
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