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Ubuntu Security Notice USN-4191-2
November 14, 2019

qemu vulnerabilities
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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