Uočene su dvije sigurnosne ranjivosti u radu jezgre operacijskog sustava Ubuntu 11.10. Lokalnim napadačima omogućuju izvođenje DoS napada, zaobilaženje pojedinih ograničenja i dobivanje većih ovlasti.
Paket:
Linux kernel 3.x
Operacijski sustavi:
Ubuntu Linux 11.10
Kritičnost:
5.3
Problem:
pogreška u programskoj funkciji, pogreška u programskoj komponenti
Iskorištavanje:
lokalno
Posljedica:
dobivanje većih privilegija, uskraćivanje usluga (DoS), zaobilaženje postavljenih ograničenja
Rješenje:
programska zakrpa proizvođača
CVE:
CVE-2012-1601, CVE-2012-2123
Izvorni ID preporuke:
USN-1452-1
Izvor:
Ubuntu
Problem:
Ranjivosti su posljedica pogrešaka u funkciji "cap_bprm_set_creds" i KVM (Kernel Virtual Machine) implementaciji.
Posljedica:
Napadač ih može iskoristiti za zaobilaženje sigurnosnih ograničenja, izvođenje DoS napada i stjecanje većih ovlasti.
Rješenje:
Korisnicima se savjetuje instalacija odgovarajuće nadogradnje.
==========================================================================
Ubuntu Security Notice USN-1452-1
May 25, 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:
A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual
cpu setup. An unprivileged local user could exploit this flaw to crash the
system leading to a denial of service. (CVE-2012-1601)
Steve Grubb reported a flaw with Linux fscaps (file system base
capabilities) when used to increase the permissions of a process. For
application on which fscaps are in use a local attacker can disable address
space randomization to make attacking the process with raised privileges
easier. (CVE-2012-2123)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 11.10:
linux-image-3.0.0-20-generic 3.0.0-20.34
linux-image-3.0.0-20-generic-pae 3.0.0-20.34
linux-image-3.0.0-20-omap 3.0.0-20.34
linux-image-3.0.0-20-powerpc 3.0.0-20.34
linux-image-3.0.0-20-powerpc-smp 3.0.0-20.34
linux-image-3.0.0-20-powerpc64-smp 3.0.0-20.34
linux-image-3.0.0-20-server 3.0.0-20.34
linux-image-3.0.0-20-virtual 3.0.0-20.34
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-1452-1
CVE-2012-1601, CVE-2012-2123
Package Information:
https://launchpad.net/ubuntu/+source/linux/3.0.0-20.34
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