USN-4725-1: QEMU vulnerabilities

8 February 2021

Several security issues were fixed in QEMU.

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Releases

Packages

  • qemu - Machine emulator and virtualizer

Details

It was discovered that QEMU incorrectly handled memory in iSCSI emulation.
An attacker inside the guest could possibly use this issue to obtain
sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu
18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2020-11947)

Alexander Bulekov discovered that QEMU incorrectly handled Intel e1000e
emulation. An attacker inside the guest could use this issue to cause QEMU
to crash, resulting in a denial of service. (CVE-2020-15859)

Alexander Bulekov discovered that QEMU incorrectly handled memory region
cache. An attacker inside the guest could use this issue to cause QEMU to
crash, resulting in a denial of service. This issue only affected Ubuntu
20.04 LTS, and Ubuntu 20.10. (CVE-2020-27821)

Cheol-woo Myung discovered that QEMU incorrectly handled Intel e1000e
emulation. An attacker inside the guest could use this issue to cause a
denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04
LTS, and Ubuntu 20.10. (CVE-2020-28916)

Wenxiang Qian discovered that QEMU incorrectly handled ATAPI emulation. An
attacker inside the guest could use this issue to cause QEMU to crash,
resulting in a denial of service. (CVE-2020-29443)

It was discovered that QEMU incorrectly handled VirtFS directory sharing.
An attacker inside the guest could use this issue to cause QEMU to crash,
resulting in a denial of service. (CVE-2021-20181)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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

References

Related notices

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