USN-4191-1: QEMU vulnerabilities

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

Source: USN-4191-1: QEMU vulnerabilities

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