Ispravljeni su sigurnosni nedostaci otkriveni u radu jezgre operacijskog sustava Ubuntu 11.04. Napadači ih mogu iskoristiti za pokretanje proizvoljnog programskog koda i izvođenje napada uskraćivanjem usluge (DoS).
Paket:
Linux kernel 2.6.x
Operacijski sustavi:
Ubuntu Linux 11.04
Kritičnost:
5.4
Problem:
cjelobrojno prepisivanje, neodgovarajuće rukovanje memorijom, pogreška u programskoj komponenti
Nedostaci su posljedica nepravilnosti u XFS datotečnom sustavu i FUSE modulu, pogreške u komponenti PIT (Programmable Interval Timer) te prepisivanja cijelog broja što ima za posljedicu korupciju memorije.
Posljedica:
Napadaču omogućuju izvođenje DoS napada i proizvoljno izvršavanje programskog koda.
Rješenje:
Korisnicima se savjetuje prelazak na ispravljene inačice.
==========================================================================
Ubuntu Security Notice USN-1362-1
February 13, 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:
Han-Wen Nienhuys reported a flaw in the FUSE kernel module. A local user
who can mount a FUSE file system could cause a denial of service.
(CVE-2011-3353)
A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual
interrupt control is not available a local user could use this to cause a
denial of service by starting a timer. (CVE-2011-4622)
A flaw was discovered in the XFS filesystem. If a local user mounts a
specially crafted XFS image it could potential execute arbitrary code on
the system. (CVE-2012-0038)
Chen Haogang discovered an integer overflow that could result in memory
corruption. A local unprivileged user could use this to crash the system.
(CVE-2012-0044)
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 2.6.38-13.55
linux-image-2.6.38-13-generic-pae 2.6.38-13.55
linux-image-2.6.38-13-omap 2.6.38-13.55
linux-image-2.6.38-13-powerpc 2.6.38-13.55
linux-image-2.6.38-13-powerpc-smp 2.6.38-13.55
linux-image-2.6.38-13-powerpc64-smp 2.6.38-13.55
linux-image-2.6.38-13-server 2.6.38-13.55
linux-image-2.6.38-13-versatile 2.6.38-13.55
linux-image-2.6.38-13-virtual 2.6.38-13.55
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1362-1
CVE-2011-3353, CVE-2011-4622, CVE-2012-0038, CVE-2012-0044
Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.38-13.55
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