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Time-of-check Time-of-use (TOCTOU) Affecting qemu package, versions <1:3.1+dfsg-2

0.0
medium

Snyk CVSS

    Attack Complexity High
    Confidentiality High

    Threat Intelligence

    EPSS 0.28% (68th percentile)
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NVD
5.3 medium
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SUSE
5 medium
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Red Hat
5 medium

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  • Snyk ID SNYK-DEBIANUNSTABLE-QEMU-428357
  • published 14 Dec 2018
  • disclosed 13 Dec 2018
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Introduced: 13 Dec 2018

CVE-2018-16872 Open this link in a new tab
CWE-367 Open this link in a new tab

How to fix?

Upgrade Debian:unstable qemu to version 1:3.1+dfsg-2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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