Otkrivena su dva propusta u Linux jezgri za EC2 (linux-ec2). Propusti se mogu iskoristiti lokalno za izvođenje DoS napada.
Paket:
linux-ec2
Operacijski sustavi:
Ubuntu Linux 10.04
Kritičnost:
4.3
Problem:
pogreška u programskoj funkciji
Iskorištavanje:
lokalno
Posljedica:
uskraćivanje usluga (DoS)
Rješenje:
programska zakrpa proizvođača
CVE:
CVE-2011-2203, CVE-2011-4110
Izvorni ID preporuke:
USN-1324-1
Izvor:
Ubuntu
Problem:
Prvi propust otkriven je u funkciji "hfs_find_init()" koja na pogrešan način tumači strukturu "sb->ext_tree". Drugi propust je uzrokovan nepravilnim rukovanjem korisničkim ključevima.
Posljedica:
Oba propusta mogu iskoristiti lokalni napadači. Točne posljedice iskorištavanja prvog propusta nisu poznate, ali moguće je nepravilno ponašanje jezgre operacijskog sustava koja ispisuje specifičan zapis o pogrešci (eng. kernel oops). Drugi propust može se iskoristiti za DoS napad.
Rješenje:
Svim korisnicima se savjetuje korištenje dostupne nadogradnje.
==========================================================================
Ubuntu Security Notice USN-1324-1
January 11, 2012
linux-ec2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.04 LTS
Summary:
Two security issues were fixed in the kernel.
Software Description:
- linux-ec2: Linux kernel for EC2
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 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 10.04 LTS:
linux-image-2.6.32-342-ec2 2.6.32-342.43
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-1324-1
CVE-2011-2203, CVE-2011-4110
Package Information:
https://launchpad.net/ubuntu/+source/linux-ec2/2.6.32-342.43
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