Ubuntu Security Notice 4372-1 - It was discovered that QEMU incorrectly handled bochs-display devices. A local attacker in a guest could use this to cause a denial of service or possibly execute arbitrary code in the host. This issue only affected Ubuntu 19.10. It was discovered that QEMU incorrectly handled memory during certain VNC operations. A remote attacker could possibly use this issue to cause QEMU to consume resources, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 19.10. Various other issues were also addressed.
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Ubuntu Security Notice USN-4372-1
May 21, 2020
qemu vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 19.10
- 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 QEMU incorrectly handled bochs-display devices. A
local attacker in a guest could use this to cause a denial of service or
possibly execute arbitrary code in the host. This issue only affected
Ubuntu 19.10. (CVE-2019-15034)
It was discovered that QEMU incorrectly handled memory during certain VNC
operations. A remote attacker could possibly use this issue to cause QEMU
to consume resources, resulting in a denial of service. This issue only
affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 19.10.
(CVE-2019-20382)
It was discovered that QEMU incorrectly generated QEMU Pointer
Authentication signatures on ARM. A local attacker could possibly use this
issue to bypass PAuth. This issue only affected Ubuntu 19.10.
(CVE-2020-10702)
Ziming Zhang discovered that QEMU incorrectly handled ATI VGA emulation. A
local attacker in a guest could use this issue to cause QEMU to crash,
resulting in a denial of service. This issue only affected Ubuntu 20.04
LTS. (CVE-2020-11869)
Aviv Sasson discovered that QEMU incorrectly handled Slirp networking. A
remote attacker could use this issue to cause QEMU to crash, resulting in a
denial of service, or possibly execute arbitrary code. This issue only
affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 19.10.
(CVE-2020-1983)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS:
qemu 1:4.2-3ubuntu6.1
qemu-system 1:4.2-3ubuntu6.1
qemu-system-arm 1:4.2-3ubuntu6.1
qemu-system-mips 1:4.2-3ubuntu6.1
qemu-system-ppc 1:4.2-3ubuntu6.1
qemu-system-s390x 1:4.2-3ubuntu6.1
qemu-system-sparc 1:4.2-3ubuntu6.1
qemu-system-x86 1:4.2-3ubuntu6.1
Ubuntu 19.10:
qemu 1:4.0+dfsg-0ubuntu9.6
qemu-system 1:4.0+dfsg-0ubuntu9.6
qemu-system-arm 1:4.0+dfsg-0ubuntu9.6
qemu-system-mips 1:4.0+dfsg-0ubuntu9.6
qemu-system-ppc 1:4.0+dfsg-0ubuntu9.6
qemu-system-s390x 1:4.0+dfsg-0ubuntu9.6
qemu-system-sparc 1:4.0+dfsg-0ubuntu9.6
qemu-system-x86 1:4.0+dfsg-0ubuntu9.6
Ubuntu 18.04 LTS:
qemu 1:2.11+dfsg-1ubuntu7.26
qemu-system 1:2.11+dfsg-1ubuntu7.26
qemu-system-arm 1:2.11+dfsg-1ubuntu7.26
qemu-system-mips 1:2.11+dfsg-1ubuntu7.26
qemu-system-ppc 1:2.11+dfsg-1ubuntu7.26
qemu-system-s390x 1:2.11+dfsg-1ubuntu7.26
qemu-system-sparc 1:2.11+dfsg-1ubuntu7.26
qemu-system-x86 1:2.11+dfsg-1ubuntu7.26
Ubuntu 16.04 LTS:
qemu 1:2.5+dfsg-5ubuntu10.44
qemu-system 1:2.5+dfsg-5ubuntu10.44
qemu-system-aarch64 1:2.5+dfsg-5ubuntu10.44
qemu-system-arm 1:2.5+dfsg-5ubuntu10.44
qemu-system-mips 1:2.5+dfsg-5ubuntu10.44
qemu-system-ppc 1:2.5+dfsg-5ubuntu10.44
qemu-system-s390x 1:2.5+dfsg-5ubuntu10.44
qemu-system-sparc 1:2.5+dfsg-5ubuntu10.44
qemu-system-x86 1:2.5+dfsg-5ubuntu10.44
After a standard system update you need to restart all QEMU virtual
machines to make all the necessary changes.
References:
https://usn.ubuntu.com/4372-1
CVE-2019-15034, CVE-2019-20382, CVE-2020-10702, CVE-2020-11869,
CVE-2020-1983
Package Information:
https://launchpad.net/ubuntu/+source/qemu/1:4.2-3ubuntu6.1
https://launchpad.net/ubuntu/+source/qemu/1:4.0+dfsg-0ubuntu9.6
https://launchpad.net/ubuntu/+source/qemu/1:2.11+dfsg-1ubuntu7.26
https://launchpad.net/ubuntu/+source/qemu/1:2.5+dfsg-5ubuntu10.44