Time-of-check Time-of-use (TOCTOU) Affecting qemu-img package, versions <15:3.0.0-4.el7


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.16% (53rd percentile)

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  • Snyk IDSNYK-ORACLE7-QEMUIMG-2543341
  • published10 Apr 2022
  • disclosed13 Dec 2018

Introduced: 13 Dec 2018

CVE-2018-16872  (opens in a new tab)
CWE-367  (opens in a new tab)

How to fix?

Upgrade Oracle:7 qemu-img to version 15:3.0.0-4.el7 or higher.
This issue was patched in ELSA-2019-4518.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu-img package and not the qemu-img package as distributed by Oracle. See How to fix? for Oracle:7 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.

CVSS Scores

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