U radu jezgre operacijskog sustava Ubuntu 11.04 uočena su tri nova sigurnosna propusta koje potencijalni napadač može iskoristiti za napad uskraćivanjem usluga (DoS).
Paket:
Linux kernel 3.x
Operacijski sustavi:
Ubuntu Linux 11.04
Kritičnost:
4
Problem:
pogreška u programskoj komponenti
Iskorištavanje:
lokalno/udaljeno
Posljedica:
uskraćivanje usluga (DoS)
Rješenje:
programska zakrpa proizvođača
CVE:
CVE-2011-4086, CVE-2012-1090, CVE-2012-2100
Izvorni ID preporuke:
USN-1432-1
Izvor:
Ubuntu
Problem:
Problemi sigurnosti su posljedica pogrešaka u implementaciji "ext4" i "cifs" datotečnih sustava.
Posljedica:
Zloćudni korisnik spomenute propuste može iskoristiti za DoS (eng. Denial of Service) napad.
==========================================================================
Ubuntu Security Notice USN-1432-1
May 08, 2012
linux vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
Summary:
Several security issues were fixed in the kernel.
Software Description:
- linux: Linux kernel
Details:
A flaw was found in the Linux's kernels ext4 file system when mounted with
a journal. A local, unprivileged user could exploit this flaw to cause a
denial of service. (CVE-2011-4086)
A flaw was discovered in the Linux kernel's cifs file system. An
unprivileged local user could exploit this flaw to crash the system leading
to a denial of service. (CVE-2012-1090)
A flaw was found in the Linux kernel's ext4 file system when mounting a
corrupt filesystem. A user-assisted remote attacker could exploit this flaw
to cause a denial of service. (CVE-2012-2100)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 11.04:
linux-image-2.6.38-15-generic 2.6.38-15.59
linux-image-2.6.38-15-generic-pae 2.6.38-15.59
linux-image-2.6.38-15-omap 2.6.38-15.59
linux-image-2.6.38-15-powerpc 2.6.38-15.59
linux-image-2.6.38-15-powerpc-smp 2.6.38-15.59
linux-image-2.6.38-15-powerpc64-smp 2.6.38-15.59
linux-image-2.6.38-15-server 2.6.38-15.59
linux-image-2.6.38-15-versatile 2.6.38-15.59
linux-image-2.6.38-15-virtual 2.6.38-15.59
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-1432-1
CVE-2011-4086, CVE-2012-1090, CVE-2012-2100
Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.38-15.59
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