USN-4191-1: QEMU vulnerabilities

  • Thread starter Ubuntu security notices
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Ubuntu security notices

Guest
qemu vulnerabilities


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

  • Ubuntu 19.10
  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
Summary


Several security issues were fixed in QEMU.

Software Description

  • qemu - Machine emulator and virtualizer
Details


It was discovered that the LSI SCSI adapter emulator implementation in QEMU did not properly validate executed scripts. A local attacker could use this to cause a denial of service. (CVE-2019-12068)

Sergej Schumilo, Cornelius Aschermann and Simon Wörner discovered that the qxl paravirtual graphics driver implementation in QEMU contained a null pointer dereference. A local attacker in a guest could use this to cause a denial of service. (CVE-2019-12155)

Riccardo Schirone discovered that the QEMU bridge helper did not properly validate network interface names. A local attacker could possibly use this to bypass ACL restrictions. (CVE-2019-13164)

It was discovered that a heap-based buffer overflow existed in the SLiRP networking implementation of QEMU. A local attacker in a guest could use this to cause a denial of service or possibly execute arbitrary code in the host. (CVE-2019-14378)

It was discovered that a use-after-free vulnerability existed in the SLiRP networking implementation of QEMU. A local attacker in a guest could use this to cause a denial of service. (CVE-2019-15890)

Update instructions


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

Ubuntu 19.10
qemu - 1:4.0+dfsg-0ubuntu9.1
qemu-kvm - 1:4.0+dfsg-0ubuntu9.1
qemu-system-common - 1:4.0+dfsg-0ubuntu9.1
qemu-system-gui - 1:4.0+dfsg-0ubuntu9.1
qemu-system-x86 - 1:4.0+dfsg-0ubuntu9.1
qemu-user-static - 1:4.0+dfsg-0ubuntu9.1
qemu-utils - 1:4.0+dfsg-0ubuntu9.1
Ubuntu 19.04
qemu - 1:3.1+dfsg-2ubuntu3.6
qemu-kvm - 1:3.1+dfsg-2ubuntu3.6
qemu-system-common - 1:3.1+dfsg-2ubuntu3.6
qemu-system-gui - 1:3.1+dfsg-2ubuntu3.6
qemu-system-x86 - 1:3.1+dfsg-2ubuntu3.6
qemu-user-static - 1:3.1+dfsg-2ubuntu3.6
qemu-utils - 1:3.1+dfsg-2ubuntu3.6
Ubuntu 18.04 LTS
qemu - 1:2.11+dfsg-1ubuntu7.20
qemu-kvm - 1:2.11+dfsg-1ubuntu7.20
qemu-system-common - 1:2.11+dfsg-1ubuntu7.20
qemu-system-x86 - 1:2.11+dfsg-1ubuntu7.20
qemu-user-static - 1:2.11+dfsg-1ubuntu7.20
qemu-utils - 1:2.11+dfsg-1ubuntu7.20
Ubuntu 16.04 LTS
qemu - 1:2.5+dfsg-5ubuntu10.42
qemu-kvm - 1:2.5+dfsg-5ubuntu10.42
qemu-system-common - 1:2.5+dfsg-5ubuntu10.42
qemu-system-x86 - 1:2.5+dfsg-5ubuntu10.42
qemu-user-static - 1:2.5+dfsg-5ubuntu10.42
qemu-utils - 1:2.5+dfsg-5ubuntu10.42

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.

References


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