CVE-2018-16872

LOW

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.

References

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/[email protected]/message/CGCFIFSIWUREEQQOZDZFBYKWZHXCWBZN/

https://lists.fedoraproject.org/archives/list/[email protected]/message/KJMTVGDLA654HNCDGLCUEIP36SNJEKK7/

https://seclists.org/bugtraq/2019/May/76

https://usn.ubuntu.com/3923-1/

https://www.debian.org/security/2019/dsa-4454

Details

Source: MITRE

Published: 2018-12-13

Updated: 2019-05-31

Type: CWE-20

Risk Information

CVSS v2.0

Base Score: 3.5

Vector: AV:N/AC:M/Au:S/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 6.8

Severity: LOW

CVSS v3.0

Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 1.6

Severity: MEDIUM