Uočene su tri sigurnosne ranjivosti u radu jezgre operacijskog sustava Ubuntu 11.04. Ranjivost je moguće iskoristiti lokalno za rušenje ranjivog sustava i otkrivanje osjetljivih podataka.
Ranjivosti su uzrokovane greškom u funkciji "hfs_find_init() sb->ext_tree", nepravilnim rukovanjem korisničkih tipova ključeva te nesigurnim čitanjem TPM podataka.
Posljedica:
Prve dvije ranjivost mogu se iskoristiti za lokalno izvođenje DoS napada. Treća ranjivost lokalnim napadačima omogućuje čitanje rezultata prethodnih TPM naredbi.
Rješenje:
Svim korisnicima savjetuje se korištenje odgovarajuće nadogradnje.
==========================================================================
Ubuntu Security Notice USN-1345-1
January 24, 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:
Peter Huewe discovered an information leak in the handling of reading
security-related TPM data. A local, unprivileged user could read the
results of a previous TPM command. (CVE-2011-1162)
Clement Lecigne discovered a bug in the HFS filesystem. A local attacker
could exploit this to cause a kernel oops. (CVE-2011-2203)
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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 11.04:
linux-image-2.6.38-13-generic 2.6.38-13.54
linux-image-2.6.38-13-generic-pae 2.6.38-13.54
linux-image-2.6.38-13-omap 2.6.38-13.54
linux-image-2.6.38-13-powerpc 2.6.38-13.54
linux-image-2.6.38-13-powerpc-smp 2.6.38-13.54
linux-image-2.6.38-13-powerpc64-smp 2.6.38-13.54
linux-image-2.6.38-13-server 2.6.38-13.54
linux-image-2.6.38-13-versatile 2.6.38-13.54
linux-image-2.6.38-13-virtual 2.6.38-13.54
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1345-1
CVE-2011-1162, CVE-2011-2203, CVE-2011-4110
Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.38-13.54
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