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AUSCERT External Security Bulletin Redistribution
ESB-2021.0430
USN-4725-1: QEMU vulnerabilities
9 February 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: QEMU
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Access Confidential Data -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20181 CVE-2020-29443 CVE-2020-28916
CVE-2020-27821 CVE-2020-15859 CVE-2020-11947
Original Bulletin:
https://ubuntu.com/security/notices/USN-4725-1
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running QEMU check for an updated version of the software for their
operating system.
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USN-4725-1: QEMU vulnerabilities
08 February 2021
Several security issues were fixed in QEMU.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o 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 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o qemu-system - 1:5.0-5ubuntu9.4
o qemu-system-arm - 1:5.0-5ubuntu9.4
o qemu-system-mips - 1:5.0-5ubuntu9.4
o qemu-system-misc - 1:5.0-5ubuntu9.4
o qemu-system-ppc - 1:5.0-5ubuntu9.4
o qemu-system-s390x - 1:5.0-5ubuntu9.4
o qemu-system-sparc - 1:5.0-5ubuntu9.4
o qemu-system-x86 - 1:5.0-5ubuntu9.4
o qemu-system-x86-microvm - 1:5.0-5ubuntu9.4
o qemu-system-x86-xen - 1:5.0-5ubuntu9.4
Ubuntu 20.04
o qemu-system - 1:4.2-3ubuntu6.12
o qemu-system-arm - 1:4.2-3ubuntu6.12
o qemu-system-mips - 1:4.2-3ubuntu6.12
o qemu-system-misc - 1:4.2-3ubuntu6.12
o qemu-system-ppc - 1:4.2-3ubuntu6.12
o qemu-system-s390x - 1:4.2-3ubuntu6.12
o qemu-system-sparc - 1:4.2-3ubuntu6.12
o qemu-system-x86 - 1:4.2-3ubuntu6.12
o qemu-system-x86-microvm - 1:4.2-3ubuntu6.12
o qemu-system-x86-xen - 1:4.2-3ubuntu6.12
Ubuntu 18.04
o qemu-system - 1:2.11+dfsg-1ubuntu7.35
o qemu-system-arm - 1:2.11+dfsg-1ubuntu7.35
o qemu-system-mips - 1:2.11+dfsg-1ubuntu7.35
o qemu-system-misc - 1:2.11+dfsg-1ubuntu7.35
o qemu-system-ppc - 1:2.11+dfsg-1ubuntu7.35
o qemu-system-s390x - 1:2.11+dfsg-1ubuntu7.35
o qemu-system-sparc - 1:2.11+dfsg-1ubuntu7.35
o qemu-system-x86 - 1:2.11+dfsg-1ubuntu7.35
Ubuntu 16.04
o qemu-system - 1:2.5+dfsg-5ubuntu10.49
o qemu-system-aarch64 - 1:2.5+dfsg-5ubuntu10.49
o qemu-system-arm - 1:2.5+dfsg-5ubuntu10.49
o qemu-system-mips - 1:2.5+dfsg-5ubuntu10.49
o qemu-system-misc - 1:2.5+dfsg-5ubuntu10.49
o qemu-system-ppc - 1:2.5+dfsg-5ubuntu10.49
o qemu-system-s390x - 1:2.5+dfsg-5ubuntu10.49
o qemu-system-sparc - 1:2.5+dfsg-5ubuntu10.49
o qemu-system-x86 - 1:2.5+dfsg-5ubuntu10.49
After a standard system update you need to restart all QEMU virtual
machines to make all the necessary changes.
References
o CVE-2020-15859
o CVE-2020-27821
o CVE-2020-28916
o CVE-2020-29443
o CVE-2020-11947
o CVE-2021-20181
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