Ispravljen je propust vezan uz jezgru (eng. kernel) operacijskog sustava Ubuntu 12.04 LTS čijim iskorištavanjem se omogućava napadaču uskraćivanje usluge.
Paket:
Linux kernel 3.x
Operacijski sustavi:
Ubuntu Linux 12.04
Kritičnost:
4.9
Problem:
neodgovarajuće rukovanje memorijom
Iskorištavanje:
lokalno
Posljedica:
uskraćivanje usluga (DoS)
Rješenje:
programska zakrpa proizvođača
CVE:
CVE-2012-2390
Izvorni ID preporuke:
USN-1508-1
Izvor:
Ubuntu
Problem:
Prilikom poziva za anonimnu alokaciju memorije, funkcija hugetlb_reserve_pages() napravi poziv funkcije resv_map_alloc(). Ovisno o kodu unutar funkcije hugetlbfs's vm_ops->close() ovisi puštanje alocirane memorije.
Posljedica:
Lokalni zlonamjerni korisnik mogao je ovo iskoristiti kako bi srušio sustav i doveo do uskraćivanja usluge.
Rješenje:
Preporuča se instalacija odgovarajućih nadogradnji sustava.
==========================================================================
Ubuntu Security Notice USN-1508-1
July 17, 2012
linux-ti-omap4 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
Summary:
The system could be made to crash under certain conditions.
Software Description:
- linux-ti-omap4: Linux kernel for OMAP4
Details:
An error was discovered in the Linux kernel's memory subsystem (hugetlb).
An unprivileged local user could exploit this flaw to cause a denial of
service (crash the system).
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 12.04 LTS:
linux-image-3.2.0-1416-omap4 3.2.0-1416.22
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-1508-1
CVE-2012-2390
Package Information:
https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.2.0-1416.22
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