Date: Sat, 13 Jun 2015 13:58:42 +0100 From: Dave Walker <email@...iey.com> To: oss-security@...ts.openwall.com, Bastian Blank <waldi@...ian.org> Cc: openstack-security@...ts.openstack.org Subject: Re: CVE-2015-1850: OpenStack Cinder/Nova: Format-guessing and file disclosure in image convert On 13 Jun 2015 10:17 am, "Bastian Blank" <waldi@...ian.org> wrote: > > Hi > > OpenStack Cinder and Nova do not provide input format to several calls > of "qemu-img convert". In Cinder these calls are done as root. This > allows the attacker to play the format guessing in qemu-img by providing > input with a qcow2 signature. If this signature contains a base file, > this file will be read by a process running as root and embedded in the > output. This bug is similar to CVE-2013-1922 and has been assigned > CVE-2015-1850. > > Tested with: lvm backed volume storage in Cinder, it may apply to others > as well. > > Steps to reproduce: > - create volume and attach to vm, > - create a qcow2 signature on the volume containing a base-file from > within the vm and > - trigger an upload to Glance with "cinder upload-to-image --disk-type > qcow2". > The image uploaded to Glance will have the base-file from the > cinder-volume host embedded. > > Affected versions: tested on 2014.1.3, found while reading 2014.2.1 > > Timeline: > - Reported upstream 2015-01-27 > - Published 2015-06-13 > > Regards, > Bastian Blank > > : qemu-img create -f qcow2 -b /etc/passwd /dev/vdb > : The disk-type != raw triggers the use of "qemu-img convert" Hi, +CC openstack-security I see that this is being brought to oss-sec', but seemingly not via the OpenStack Security Group or Vulnerability Management Team. CVE-2015-1850 is referenced in your mail, are you saying that this has been assigned to this issue? I cannot easily find any other reference of its allocation. You said that this was raised upstream on 2015-01-27, do you have a Launchpad bug number or information on this discourse as to what was the outcome? Thanks -- Kind Regards, Dave Walker
Powered by blists - more mailing lists
Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.