Kod programskog paketa qemu-kvm uočena su dva nova propusta koja mogu zlonamjernm korisnicima omogućiti pokretanje prozvoljnog programskog koda i izvođenje DoS napada.
Paket:
qemu-kvm 0.x
Operacijski sustavi:
Ubuntu Linux 10.04, Ubuntu Linux 10.10, Ubuntu Linux 11.04
Problemi su uzrokovani neodgovarajućom provjerom određenih virtqueue zahtjeva te nepravilnom usporedbom cjelobrojnih vrijednosti prilikom ulazne virtqueue validacije.
Posljedica:
Napadač može iskoristiti propuste za pokretanje proizvoljnog programskog koda i izvođenje napada uskraćivanja usluge.
Rješenje:
Korisnici se upućuju na korištenje odgovarajuće nadogradnje.
==========================================================================
Ubuntu Security Notice USN-1165-1
July 06, 2011
qemu-kvm vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
Summary:
A privileged attacker within a QEMU guest could cause QEMU to crash.
Software Description:
- qemu-kvm: Machine emulator and virtualizer
Details:
Nelson Elhage discoverd that QEMU did not properly validate certain
virtqueue requests from the guest. An attacker could exploit this to cause
a denial of service of the guest or possibly execute code with the
privileges of the user invoking the program. (CVE-2011-2212)
Stefan Hajnoczi discovered that QEMU did not properly perform integer
comparisons when performing virtqueue input validation. An attacker could
exploit this to cause a denial of service of the guest or possibly execute
code with the privileges of the user invoking the program. (CVE-2011-2512)
When using QEMU with libvirt or virtualization management software based on
libvirt such as Eucalyptus and OpenStack, QEMU guests are individually
isolated by an AppArmor profile by default in Ubuntu.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 11.04:
qemu-kvm 0.14.0+noroms-0ubuntu4.3
Ubuntu 10.10:
qemu-kvm 0.12.5+noroms-0ubuntu7.8
qemu-kvm-extras 0.12.5+noroms-0ubuntu7.8
qemu-kvm-extras-static 0.12.5+noroms-0ubuntu7.8
Ubuntu 10.04 LTS:
qemu-kvm 0.12.3+noroms-0ubuntu9.12
qemu-kvm-extras 0.12.3+noroms-0ubuntu9.12
qemu-kvm-extras-static 0.12.3+noroms-0ubuntu9.12
After a standard system update you need to restart running virtual machines
to make all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1165-1
CVE-2011-2212, CVE-2011-2512
Package Information:
https://launchpad.net/ubuntu/+source/qemu-kvm/0.14.0+noroms-0ubuntu4.3
https://launchpad.net/ubuntu/+source/qemu-kvm/0.12.5+noroms-0ubuntu7.8
https://launchpad.net/ubuntu/+source/qemu-kvm/0.12.3+noroms-0ubuntu9.12
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