Otkriveno je nekoliko sigurnosnih propusta u jezgri operacijskog sustava koji se mogu iskoristiti lokalno za izvođenje DoS napada, zaobilaženje prijave lozinkom i povećanje privilegija napadača.
Neki propusti su otkriveni u komponentama: CIFS, KSM i NLM (eng. NFS Lock Manager). Uzrokovani su nepravilnom autentifikacijom, lošom provjerom SSID duljina te neodgovarajućom obradom određenih zahtjeva.
Posljedica:
Svi propusti se mogu iskoristiti lokalno, a posljedice uključuju: zaobilaženje unosa lozinke, DoS napad i stjecanje root ovlasti.
Rješenje:
Svi korisnici se potiču na korištenje službenih programskih zakrpi.
==========================================================================
Ubuntu Security Notice USN-1272-1
November 21, 2011
linux 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: Linux kernel
Details:
It was discovered that CIFS incorrectly handled authentication. When a user
had a CIFS share mounted that required authentication, a local user could
mount the same share without knowing the correct password. (CVE-2011-1585)
Andrea Righi discovered a race condition in the KSM memory merging support.
If KSM was being used, a local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2011-2183)
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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 10.10:
linux-image-2.6.35-31-generic 2.6.35-31.62
linux-image-2.6.35-31-generic-pae 2.6.35-31.62
linux-image-2.6.35-31-omap 2.6.35-31.62
linux-image-2.6.35-31-powerpc 2.6.35-31.62
linux-image-2.6.35-31-powerpc-smp 2.6.35-31.62
linux-image-2.6.35-31-powerpc64-smp 2.6.35-31.62
linux-image-2.6.35-31-server 2.6.35-31.62
linux-image-2.6.35-31-versatile 2.6.35-31.62
linux-image-2.6.35-31-virtual 2.6.35-31.62
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-1272-1
CVE-2011-1585, CVE-2011-2183, CVE-2011-2491, CVE-2011-2496,
CVE-2011-2517
Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.35-31.62
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