CVE-2018-16872 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00042.html http://www.securityfocus.com/bid/106212 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16872 https://lists.debian.org/debian-lts-announce/2019/02/msg00041.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CGCFIFSIWUREEQQOZDZFBYKWZHXCWBZN/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KJMTVGDLA654HNCDGLCUEIP36SNJEKK7/ https://seclists.org/bugtraq/2019/May/76 https://usn.ubuntu.com/3923-1/ https://www.debian.org/security/2019/dsa-4454

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.3