U radu jezgre operacijskog sustava Ubuntu 11.10 otkiveno je nekoliko sigurnosnih propusta koji lokalnom zlonamjernom korisniku omogućuju rušenje ranjivog sustava te stjecanje administratorskih ovlasti.
Paket:
Linux kernel 3.x
Operacijski sustavi:
Ubuntu Linux 11.10
Kritičnost:
7.2
Problem:
neodgovarajuće rukovanje memorijom, pogreška u programskoj funkciji, pogreška u programskoj komponenti
Iskorištavanje:
lokalno
Posljedica:
dobivanje većih privilegija, uskraćivanje usluga (DoS)
Propusti su posljedica pogrešaka u UDF datotečnom sustavu, epoll sistemskom pozivu, komponenti za upravljanje memorijom te implementaciji TUN/TAP mrežnog uređaja.
Posljedica:
Nepravilnosti je moguće iskoristiti za izvođenje DoS napada i dobivanje administratorskih privilegija.
Rješenje:
Korisnicima se savjetuje korištenje najnovije inačice.
==========================================================================
Ubuntu Security Notice USN-1533-1
August 10, 2012
linux vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
Summary:
Several security issues were fixed in the kernel.
Software Description:
- linux: Linux kernel
Details:
An error was discovered in the Linux kernel's network TUN/TAP device
implementation. A local user with access to the TUN/TAP interface (which is
not available to unprivileged users until granted by a root user) could
exploit this flaw to crash the system or potential gain administrative
privileges. (CVE-2012-2136)
Ulrich Obergfell discovered an error in the Linux kernel's memory
management subsystem on 32 bit PAE systems with more than 4GB of memory
installed. A local unprivileged user could exploit this flaw to crash the
system. (CVE-2012-2373)
A flaw was discovered in the Linux kernel's epoll system call. An
unprivileged local user could use this flaw to crash the system.
(CVE-2012-3375)
Some errors where discovered in the Linux kernel's UDF file system, which
is used to mount some CD-ROMs and DVDs. An unprivileged local user could
use these flaws to crash the system. (CVE-2012-3400)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 11.10:
linux-image-3.0.0-24-generic 3.0.0-24.40
linux-image-3.0.0-24-generic-pae 3.0.0-24.40
linux-image-3.0.0-24-omap 3.0.0-24.40
linux-image-3.0.0-24-powerpc 3.0.0-24.40
linux-image-3.0.0-24-powerpc-smp 3.0.0-24.40
linux-image-3.0.0-24-powerpc64-smp 3.0.0-24.40
linux-image-3.0.0-24-server 3.0.0-24.40
linux-image-3.0.0-24-virtual 3.0.0-24.40
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.
References:
http://www.ubuntu.com/usn/usn-1533-1
CVE-2012-2136, CVE-2012-2373, CVE-2012-3375, CVE-2012-3400
Package Information:
https://launchpad.net/ubuntu/+source/linux/3.0.0-24.40
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