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             AUSCERT External Security Bulletin Redistribution

                     USN-4372-1: QEMU vulnerabilities
                                22 May 2020


        AusCERT Security Bulletin Summary

Product:           QEMU
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-11869 CVE-2020-10702 CVE-2020-1983
                   CVE-2019-20382 CVE-2019-15034 

Reference:         ESB-2020.1635

Original Bulletin: 

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USN-4372-1: QEMU vulnerabilities
21 May 2020

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

  o Ubuntu 20.04 LTS
  o Ubuntu 19.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS


Several security issues were fixed in QEMU.

Software Description

  o qemu - Machine emulator and virtualizer


It was discovered that QEMU incorrectly handled bochs-display devices. A local
attacker in a guest could use this to cause a denial of service or possibly
execute arbitrary code in the host. This issue only affected Ubuntu 19.10.

It was discovered that QEMU incorrectly handled memory during certain VNC
operations. A remote attacker could possibly use this issue to cause QEMU to
consume resources, resulting in a denial of service. This issue only affected
Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 19.10. (CVE-2019-20382)

It was discovered that QEMU incorrectly generated QEMU Pointer Authentication
signatures on ARM. A local attacker could possibly use this issue to bypass
PAuth. This issue only affected Ubuntu 19.10. (CVE-2020-10702)

Ziming Zhang discovered that QEMU incorrectly handled ATI VGA emulation. A
local attacker in a guest could use this issue to cause QEMU to crash,
resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS.

Aviv Sasson discovered that QEMU incorrectly handled Slirp networking. A remote
attacker could use this issue to cause QEMU to crash, resulting in a denial of
service, or possibly execute arbitrary code. This issue only affected Ubuntu
16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 19.10. (CVE-2020-1983)

Update instructions

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

Ubuntu 20.04 LTS
    qemu - 1:4.2-3ubuntu6.1
    qemu-system - 1:4.2-3ubuntu6.1
    qemu-system-arm - 1:4.2-3ubuntu6.1
    qemu-system-mips - 1:4.2-3ubuntu6.1
    qemu-system-ppc - 1:4.2-3ubuntu6.1
    qemu-system-s390x - 1:4.2-3ubuntu6.1
    qemu-system-sparc - 1:4.2-3ubuntu6.1
    qemu-system-x86 - 1:4.2-3ubuntu6.1
Ubuntu 19.10
    qemu - 1:4.0+dfsg-0ubuntu9.6
    qemu-system - 1:4.0+dfsg-0ubuntu9.6
    qemu-system-arm - 1:4.0+dfsg-0ubuntu9.6
    qemu-system-mips - 1:4.0+dfsg-0ubuntu9.6
    qemu-system-ppc - 1:4.0+dfsg-0ubuntu9.6
    qemu-system-s390x - 1:4.0+dfsg-0ubuntu9.6
    qemu-system-sparc - 1:4.0+dfsg-0ubuntu9.6
    qemu-system-x86 - 1:4.0+dfsg-0ubuntu9.6
Ubuntu 18.04 LTS
    qemu - 1:2.11+dfsg-1ubuntu7.26
    qemu-system - 1:2.11+dfsg-1ubuntu7.26
    qemu-system-arm - 1:2.11+dfsg-1ubuntu7.26
    qemu-system-mips - 1:2.11+dfsg-1ubuntu7.26
    qemu-system-ppc - 1:2.11+dfsg-1ubuntu7.26
    qemu-system-s390x - 1:2.11+dfsg-1ubuntu7.26
    qemu-system-sparc - 1:2.11+dfsg-1ubuntu7.26
    qemu-system-x86 - 1:2.11+dfsg-1ubuntu7.26
Ubuntu 16.04 LTS
    qemu - 1:2.5+dfsg-5ubuntu10.44
    qemu-system - 1:2.5+dfsg-5ubuntu10.44
    qemu-system-aarch64 - 1:2.5+dfsg-5ubuntu10.44
    qemu-system-arm - 1:2.5+dfsg-5ubuntu10.44
    qemu-system-mips - 1:2.5+dfsg-5ubuntu10.44
    qemu-system-ppc - 1:2.5+dfsg-5ubuntu10.44
    qemu-system-s390x - 1:2.5+dfsg-5ubuntu10.44
    qemu-system-sparc - 1:2.5+dfsg-5ubuntu10.44
    qemu-system-x86 - 1:2.5+dfsg-5ubuntu10.44

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

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


  o CVE-2019-15034
  o CVE-2019-20382
  o CVE-2020-10702
  o CVE-2020-11869
  o CVE-2020-1983

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