USN-4191-2: QEMU vulnerabilities

14 November 2019

qemu vulnerabilities

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

  • Ubuntu 14.04 ESM

Summary

Several security issues were fixed in QEMU.

Software Description

  • qemu - Machine emulator and virtualizer

Details

USN-4191-2 fixed a vulnerability in QEMU. This update provides the corresponding update for Ubuntu 14.04 ESM.

Original advisory 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 W├Ârner 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 14.04 ESM
qemu - 2.0.0+dfsg-2ubuntu1.47
qemu-common - 2.0.0+dfsg-2ubuntu1.47
qemu-kvm - 2.0.0+dfsg-2ubuntu1.47
qemu-system-common - 2.0.0+dfsg-2ubuntu1.47
qemu-system-x86 - 2.0.0+dfsg-2ubuntu1.47
qemu-user-static - 2.0.0+dfsg-2ubuntu1.47
qemu-utils - 2.0.0+dfsg-2ubuntu1.47

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