U jezgri linux-mvl-dove otkriveno je nekoliko sigurnosnih propusta koji se mogu iskoristiti lokalno kako bi izveo DoS napad i povećala ovlast napadača.
Paket:
linux-mvl-dove 2.x
Operacijski sustavi:
Ubuntu Linux 10.10
Kritičnost:
6.8
Problem:
neodgovarajuća provjera ulaznih podataka, pogreška u programskoj komponenti
Iskorištavanje:
lokalno
Posljedica:
dobivanje većih privilegija, uskraćivanje usluga (DoS)
Propusti su povezani s nepravilnim korištenjem zahtjeva u NLM (eng. NFS Lock Manager), pogrešnom provjerom SSID duljina i nepravilnom upotrebom qdiscs (Classless Queuing Disciplines).
Posljedica:
Propusti se mogu iskoristiti lokalno za izvođenje DoS napada i dobivanje root ovlasti.
Rješenje:
Preporuča se korištenje programske nadogradnje koja otklanja opisane propuste.
==========================================================================
Ubuntu Security Notice USN-1274-1
November 21, 2011
linux-mvl-dove vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.10
Summary:
Several security issues were fixed in the kernel.
Software Description:
- linux-mvl-dove: Linux kernel for DOVE
Details:
Vasily Averin discovered that the NFS Lock Manager (NLM) incorrectly
handled unlock requests. A local attacker could exploit this to cause a
denial of service. (CVE-2011-2491)
Robert Swiecki discovered that mapping extensions were incorrectly handled.
A local attacker could exploit this to crash the system, leading to a
denial of service. (CVE-2011-2496)
It was discovered that the wireless stack incorrectly verified SSID
lengths. A local attacker could exploit this to cause a denial of service
or gain root privileges. (CVE-2011-2517)
Ben Pfaff discovered that Classless Queuing Disciplines (qdiscs) were being
incorrectly handled. A local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2011-2525)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 10.10:
linux-image-2.6.32-420-dove 2.6.32-420.38
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-1274-1
CVE-2011-2491, CVE-2011-2496, CVE-2011-2517, CVE-2011-2525
Package Information:
https://launchpad.net/ubuntu/+source/linux-mvl-dove/2.6.32-420.38
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