Ubuntu update for qemu

1) Out-of-bounds write

EUVDB-ID: #VU31803

Risk: Medium

CVSSv4.0: 6.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-13754

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in hw/pci/msix.c. A local user on the guest operating system can send specially crafted address in an msi-x mmio operation, trick the victim into opening it using the affected software, trigger out-of-bounds write and execute arbitrary code.

Mitigation

Update the affected package qemu to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 20.10

qemu-system-x86-xen (Ubuntu package): before 1:4.2-3ubuntu6.14

qemu-system-x86-microvm (Ubuntu package): before 1:4.2-3ubuntu6.14

qemu-system-x86 (Ubuntu package): before 1:2.5+dfsg-5ubuntu10.51

qemu-system-sparc (Ubuntu package): before 1:2.5+dfsg-5ubuntu10.51

qemu-system-s390x (Ubuntu package): before 1:2.5+dfsg-5ubuntu10.51

qemu-system-ppc (Ubuntu package): before 1:2.5+dfsg-5ubuntu10.51

qemu-system-misc (Ubuntu package): before 1:2.5+dfsg-5ubuntu10.51

qemu-system-mips (Ubuntu package): before 1:2.5+dfsg-5ubuntu10.51

qemu-system-arm (Ubuntu package): before 1:2.5+dfsg-5ubuntu10.51

qemu-system (Ubuntu package): before 1:2.5+dfsg-5ubuntu10.51

qemu (Ubuntu package): before 1:2.5+dfsg-5ubuntu10.51

qemu-system-aarch64 (Ubuntu package): before 1:2.5+dfsg-5ubuntu10.51

CPE2.3

• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:20.10:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:qemu-system-x86-xen:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu-system-x86-microvm:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu-system-x86_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu-system-sparc_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu-system-s390x_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu-system-ppc_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu-system-misc_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu-system-mips_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu-system-arm_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu-system_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:qemu-system-aarch64_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-4467-3

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.