Ispravljena su dva sigurnosna propusta vezana uz linux-ec2, jezgru operacijskog sustava Linux za EC2, koje lokalni napadač može iskoristiti za izvođenje napada uskraćivanjem usluge ili dobivanje većih ovlasti.
Paket:
linux-ec2
Operacijski sustavi:
Ubuntu Linux 10.04
Kritičnost:
7.2
Problem:
neodgovarajuće rukovanje memorijom, pogreška u programskoj funkciji
Iskorištavanje:
lokalno
Posljedica:
dobivanje većih privilegija, uskraćivanje usluga (DoS)
Rješenje:
programska zakrpa proizvođača
CVE:
CVE-2012-2136, CVE-2012-2390
Izvorni ID preporuke:
USN-1534-1
Izvor:
Ubuntu
Problem:
Propusti su posljedica gubljenja memorije u datoteci "mm/hugetlb.c" i pogrešaka u funkciji "sock_alloc_send_pskb".
Posljedica:
Propusti omogućuju lokalnom napadaču izvođenje DoS napada ili stjecanje povećanih ovlasti.
Rješenje:
Svim korisnicima se savjetuje korištenje nadogradnje koja otklanja opisane ranjivosti.
==========================================================================
Ubuntu Security Notice USN-1534-1
August 10, 2012
linux-ec2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.04 LTS
Summary:
Several security issues were fixed in the kernel.
Software Description:
- linux-ec2: Linux kernel for EC2
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)
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). (CVE-2012-2390)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 10.04 LTS:
linux-image-2.6.32-347-ec2 2.6.32-347.52
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-1534-1
CVE-2012-2136, CVE-2012-2390
Package Information:
https://launchpad.net/ubuntu/+source/linux-ec2/2.6.32-347.52
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