6.5 - USN-4191-2

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 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 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

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

References:
https://usn.ubuntu.com/4191-2
https://usn.ubuntu.com/4191-1
CVE-2019-12068, CVE-2019-12155, CVE-2019-13164, CVE-2019-14378,
CVE-2019-15890