==========================================================================
Ubuntu Security Notice USN-6567-2
June 06, 2024

qemu regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

USN-6567-1 introduced a regression in QEMU.

Software Description:
- qemu: Machine emulator and virtualizer

Details:

USN-6567-1 fixed vulnerabilities QEMU. The fix for CVE-2023-2861 was too
restrictive and introduced a behaviour change leading to a regression in
certain environments. This update fixes the problem.

Original advisory details:

  Gaoning Pan and Xingwei Li discovered that QEMU incorrectly handled the
  USB xHCI controller device. A privileged guest attacker could possibly use
  this issue to cause QEMU to crash, leading to a denial of service. This
  issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2020-14394)
   It was discovered that QEMU incorrectly handled the TCG Accelerator. A
  local attacker could use this issue to cause QEMU to crash, leading to a
  denial of service, or possibly execute arbitrary code and esclate
  privileges. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-24165)
   It was discovered that QEMU incorrectly handled the Intel HD audio device.
  A malicious guest attacker could use this issue to cause QEMU to crash,
  leading to a denial of service. This issue only affected Ubuntu 22.04 LTS.
  (CVE-2021-3611)
   It was discovered that QEMU incorrectly handled the ATI VGA device. A
  malicious guest attacker could use this issue to cause QEMU to crash,
  leading to a denial of service. This issue only affected Ubuntu 20.04 LTS.
  (CVE-2021-3638)
   It was discovered that QEMU incorrectly handled the VMWare paravirtual RDMA
  device. A malicious guest attacker could use this issue to cause QEMU to
  crash, leading to a denial of service. (CVE-2023-1544)
   It was discovered that QEMU incorrectly handled the 9p passthrough
  filesystem. A malicious guest attacker could possibly use this issue to
  open special files and escape the exported 9p tree. This issue only
  affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 23.04.
  (CVE-2023-2861)
   It was discovered that QEMU incorrectly handled the virtual crypto device.
  A malicious guest attacker could use this issue to cause QEMU to crash,
  leading to a denial of service, or possibly execute arbitrary code. This
  issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 23.04.
  (CVE-2023-3180)
   It was discovered that QEMU incorrectly handled the built-in VNC server.
  A remote authenticated attacker could possibly use this issue to cause QEMU
  to stop responding, resulting in a denial of service. This issue only
  affected Ubuntu 22.04 LTS and Ubuntu 23.04. (CVE-2023-3255)
   It was discovered that QEMU incorrectly handled net device hot-unplugging.
  A malicious guest attacker could use this issue to cause QEMU to crash,
  leading to a denial of service. This issue only affected Ubuntu 22.04 LTS
  and Ubuntu 23.04. (CVE-2023-3301)
   It was discovered that QEMU incorrectly handled the built-in VNC server.
  A remote attacker could possibly use this issue to cause QEMU to crash,
  resulting in a denial of service. This issue only affected Ubuntu 20.04
  LTS, Ubuntu 22.04 LTS, and Ubuntu 23.04. (CVE-2023-3354)
   It was discovered that QEMU incorrectly handled NVME devices. A malicious
  guest attacker could use this issue to cause QEMU to crash, leading to a
  denial of service. This issue only affected Ubuntu 23.10. (CVE-2023-40360)
   It was discovered that QEMU incorrectly handled NVME devices. A malicious
  guest attacker could use this issue to cause QEMU to crash, leading to a
  denial of service, or possibly obtain sensitive information. This issue
  only affected Ubuntu 23.10. (CVE-2023-4135)
   It was discovered that QEMU incorrectly handled SCSI devices. A malicious
  guest attacker could use this issue to cause QEMU to crash, leading to a
  denial of service. This issue only affected Ubuntu 23.04 and Ubuntu 23.10.
  (CVE-2023-42467)
   It was discovered that QEMU incorrectly handled certain disk offsets. A
  malicious guest attacker could possibly use this issue to gain control of
  the host in certain nested virtualization scenarios. (CVE-2023-5088)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS
   qemu-system                     1:6.2+dfsg-2ubuntu6.21
   qemu-system-arm                 1:6.2+dfsg-2ubuntu6.21
   qemu-system-mips                1:6.2+dfsg-2ubuntu6.21
   qemu-system-misc                1:6.2+dfsg-2ubuntu6.21
   qemu-system-ppc                 1:6.2+dfsg-2ubuntu6.21
   qemu-system-s390x               1:6.2+dfsg-2ubuntu6.21
   qemu-system-sparc               1:6.2+dfsg-2ubuntu6.21
   qemu-system-x86                 1:6.2+dfsg-2ubuntu6.21
   qemu-system-x86-microvm         1:6.2+dfsg-2ubuntu6.21
   qemu-system-x86-xen             1:6.2+dfsg-2ubuntu6.21

Ubuntu 20.04 LTS
   qemu-system                     1:4.2-3ubuntu6.29
   qemu-system-arm                 1:4.2-3ubuntu6.29
   qemu-system-mips                1:4.2-3ubuntu6.29
   qemu-system-misc                1:4.2-3ubuntu6.29
   qemu-system-ppc                 1:4.2-3ubuntu6.29
   qemu-system-s390x               1:4.2-3ubuntu6.29
   qemu-system-sparc               1:4.2-3ubuntu6.29
   qemu-system-x86                 1:4.2-3ubuntu6.29
   qemu-system-x86-microvm         1:4.2-3ubuntu6.29
   qemu-system-x86-xen             1:4.2-3ubuntu6.29

After a standard system update you need to restart all QEMU virtual
machines to make all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-6567-2
   https://ubuntu.com/security/notices/USN-6567-1
   https://launchpad.net/bugs/2065579

Package Information:
   https://launchpad.net/ubuntu/+source/qemu/1:6.2+dfsg-2ubuntu6.21
   https://launchpad.net/ubuntu/+source/qemu/1:4.2-3ubuntu6.29