Hello again, I managed to re-install with the updated kernel image [linux-image].
Why I didn't receive the sought for updated kernel with 'sudo apt-get update', remains unclear to me. I've downloaded the .deb package from 'https://packages.debian.org/jessie/linux-image-3.16.0-4-amd64', followed by dpkg -i <package name>. The 'update-grub' command was automatically ran after this, and the reboot showed nothing related, it all went well. Thank you for pointing me in the right direction. Richard -- Richard Waterbeek <[email protected]> Salvatore Bonaccorso schreef op ma 07-11-2016 om 17:09 [+0100]: > Hi, > > On Mon, Nov 07, 2016 at 06:54:55PM +0300, Ozgur wrote: > > Hi all, > > > > I have been reading security articles and I seen a test with Debian Linux > > vulnerability of kernel. I tested and given a successful exploit. > > > > List a vuln: > > > > https://github.com/dirtycow/dirtycow.github.io/wiki/PoCs > > > > My testing: > > > > dirtycow.c (status: success) > > cowroot.c (status: success) > > > > For example, I have installed Debian and kernel version are as follow: > > > > Linux 3.16.0-4-amd64 (Debian 8.6) > > > > I created a "zoo" file with root privileges and locked a file: > > > > # echo I'm a root > foo > > # chmod 0404 foo > > # ls -la foo > > -r-----r-- 1 root root 11 Nov 7 10:13 foo > > > > then I'm return my user (not root) and I downloaded the exploit script and > > run it: > > > > $ gcc -pthread dirtyc0w.c -o dirtyc0w > > $ ./dirtyc0w foo blabla > > $ cat foo > > blabla > > > > what is the suggestion on this exploit? > > Have you installed the Kernel update as per the security advisory > DSA-3696-1? Which kernel image do you have installed, which kernel is > running? > > [0] https://www.debian.org/security/2016/dsa-3696 > > Regards, > Salvatore
