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Ubuntu Security Notice USN-4191-2

Ubuntu Security Notice USN-4191-2
Posted Nov 14, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4191-2 - USN-4191-2 fixed a vulnerability in QEMU. This update provides the corresponding update for Ubuntu 14.04 ESM. 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. Various other issues were also addressed.

tags | advisory, denial of service, local
systems | linux, ubuntu
advisories | CVE-2019-12068, CVE-2019-12155, CVE-2019-13164, CVE-2019-14378, CVE-2019-15890
MD5 | 08f7e0e6b2e4c5fc716d75fd51174222

Ubuntu Security Notice USN-4191-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4191-2
November 14, 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

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
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