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CVE-2018-16872

Published: 13 December 2018

A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.

Priority

Low

CVSS 3 base score: 5.3

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
bionic
Released (1:2.11+dfsg-1ubuntu7.12)
cosmic
Released (1:2.12+dfsg-3ubuntu8.6)
precise Does not exist

trusty Not vulnerable
(code not present)
upstream Needs triage

xenial Not vulnerable
(code not present)
Patches:
upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=bab9df35ce73d1c8e19a37e2737717ea1c984dc1
qemu-kvm
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Not vulnerable
(code not present)
trusty Does not exist

upstream Needs triage

xenial Does not exist