Ispravljena su dva propusta vezana uz jezgru operacijskog sustava Ubuntu 8.04 LTS koji su mogli dovesti do stvaranja stanja uskraćivanja usluge.
Paket:
Linux kernel 2.6.x
Operacijski sustavi:
Ubuntu Linux 8.04
Kritičnost:
7.8
Problem:
pogreška u programskoj komponenti
Iskorištavanje:
lokalno/udaljeno
Posljedica:
uskraćivanje usluga (DoS)
Rješenje:
programska zakrpa proizvođača
CVE:
CVE-2012-1601, CVE-2012-2744
Izvorni ID preporuke:
USN-1507-1
Izvor:
Ubuntu
Problem:
Jedan od propusta se javlja u funkciji "nf_ct_frag6_reasm()" (net/ipv6/netfilter/nf_conntrack_reasm.c). Sljedeći nastaje zbog nepravilnosti KVM implementacije.
Posljedica:
Udaljeni ili lokalni napadač je mogao iskoristiti ove propuste kako bi srušio sustav i doveo do uskraćivanja usluge.
==========================================================================
Ubuntu Security Notice USN-1507-1
July 17, 2012
linux vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 8.04 LTS
Summary:
Several security issues were fixed in the kernel.
Software Description:
- linux: Linux kernel
Details:
A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual
cpu setup. An unprivileged local user could exploit this flaw to crash the
system leading to a denial of service. (CVE-2012-1601)
An error was found in the Linux kernel's IPv6 netfilter when connection
tracking is enabled. A remote attacker could exploit this flaw to crash a
system if it is using IPv6 with the nf_contrack_ipv6 kernel module loaded.
(CVE-2012-2744)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 8.04 LTS:
linux-image-2.6.24-32-386 2.6.24-32.104
linux-image-2.6.24-32-generic 2.6.24-32.104
linux-image-2.6.24-32-hppa32 2.6.24-32.104
linux-image-2.6.24-32-hppa64 2.6.24-32.104
linux-image-2.6.24-32-itanium 2.6.24-32.104
linux-image-2.6.24-32-lpia 2.6.24-32.104
linux-image-2.6.24-32-lpiacompat 2.6.24-32.104
linux-image-2.6.24-32-mckinley 2.6.24-32.104
linux-image-2.6.24-32-openvz 2.6.24-32.104
linux-image-2.6.24-32-powerpc 2.6.24-32.104
linux-image-2.6.24-32-powerpc-smp 2.6.24-32.104
linux-image-2.6.24-32-powerpc64-smp 2.6.24-32.104
linux-image-2.6.24-32-rt 2.6.24-32.104
linux-image-2.6.24-32-server 2.6.24-32.104
linux-image-2.6.24-32-sparc64 2.6.24-32.104
linux-image-2.6.24-32-sparc64-smp 2.6.24-32.104
linux-image-2.6.24-32-virtual 2.6.24-32.104
linux-image-2.6.24-32-xen 2.6.24-32.104
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-1507-1
CVE-2012-1601, CVE-2012-2744
Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.24-32.104
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