Otkriveni su sigurnosni nedostaci u radu jezgre operacijskog sustava Ubuntu 11.10. Moguće ih je iskoristiti lokalno za izvođenje DoS (eng. Denial of Service) napada i dobivanje administratorskih ovlasti.
Paket:
Linux kernel 3.x
Operacijski sustavi:
Ubuntu Linux 11.10
Kritičnost:
5.4
Problem:
neodgovarajuća provjera ulaznih podataka, pogreška u programskoj komponenti
Iskorištavanje:
lokalno
Posljedica:
postojanje root korisničkog računa za koji nije potrebna zaporka, uskraćivanje usluga (DoS)
==========================================================================
Ubuntu Security Notice USN-1322-1
January 09, 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:
Clement Lecigne discovered a bug in the HFS filesystem. A local attacker
could exploit this to cause a kernel oops. (CVE-2011-2203)
A bug was discovered in the XFS filesystem's handling of pathnames. A local
attacker could exploit this to crash the system, leading to a denial of
service, or gain root privileges. (CVE-2011-4077)
Nick Bowler discovered the kernel GHASH message digest algorithm
incorrectly handled error conditions. A local attacker could exploit this
to cause a kernel oops. (CVE-2011-4081)
A flaw was found in how the Linux kernel handles user-defined key types. An
unprivileged local user could exploit this to crash the system.
(CVE-2011-4110)
A flaw was found in the Journaling Block Device (JBD). A local attacker
able to mount ext3 or ext4 file systems could exploit this to crash the
system, leading to a denial of service. (CVE-2011-4132)
Clement Lecigne discovered a bug in the HFS file system bounds checking.
When a malformed HFS file system is mounted a local user could crash the
system or gain root privileges. (CVE-2011-4330)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 11.10:
linux-image-3.0.0-15-generic 3.0.0-15.25
linux-image-3.0.0-15-generic-pae 3.0.0-15.25
linux-image-3.0.0-15-omap 3.0.0-15.25
linux-image-3.0.0-15-powerpc 3.0.0-15.25
linux-image-3.0.0-15-powerpc-smp 3.0.0-15.25
linux-image-3.0.0-15-powerpc64-smp 3.0.0-15.25
linux-image-3.0.0-15-server 3.0.0-15.25
linux-image-3.0.0-15-virtual 3.0.0-15.25
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-1322-1
CVE-2011-2203, CVE-2011-4077, CVE-2011-4081, CVE-2011-4110,
CVE-2011-4132, CVE-2011-4330
Package Information:
https://launchpad.net/ubuntu/+source/linux/3.0.0-15.25
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