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CVE-2021-3713

Published: 25 August 2021

An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions prior to 6.2.0-rc0. The device uses the guest supplied stream number unchecked, which can lead to out-of-bounds access to the UASDevice->data3 and UASDevice->status3 fields. A malicious guest user could use this flaw to crash QEMU or potentially achieve code execution with the privileges of the QEMU process on the host.

Notes

AuthorNote
sbeattie
Red Hat claims UAS (usb attached scsi) device emulation is not
supported by libvirt
mdeslaur
introduced in 1.5.0

Priority

Low

Cvss 3 Severity Score

7.4

Score breakdown

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(1:2.11+dfsg-1ubuntu7.37)
focal Not vulnerable
(1:4.2-3ubuntu6.17)
hirsute Ignored
(end of life)
impish
Released (1:6.0+dfsg-2expubuntu1.2)
jammy
Released (1:6.2+dfsg-2ubuntu5)
trusty Not vulnerable

upstream Needs triage

xenial Not vulnerable

Patches:
upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=13b250b12ad3c59114a6a17d59caf073ce45b33a

Severity score breakdown

Parameter Value
Base score 7.4
Attack vector Physical
Attack complexity Low
Privileges required Low
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H