A flaw was found in QEMU's 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.
Find out more about CVE-2018-16872 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L |
| Attack Vector | Local |
| Attack Complexity | High |
| Privileges Required | High |
| User Interaction | None |
| Scope | Changed |
| Confidentiality | Low |
| Integrity Impact | Low |
| Availability Impact | Low |
| Platform | Package | State |
|---|---|---|
| Red Hat OpenStack Platform 9.0 | qemu-kvm-rhev | Not affected |
| Red Hat OpenStack Platform 8.0 (Liberty) | qemu-kvm-rhev | Not affected |
| Red Hat OpenStack Platform 14 | qemu-kvm-rhev | Not affected |
| Red Hat OpenStack Platform 13.0 (Queens) | qemu-kvm-rhev | Not affected |
| Red Hat OpenStack Platform 12.0 | qemu-kvm-rhev | Not affected |
| Red Hat OpenStack Platform 10 | qemu-kvm-rhev | Not affected |
| Red Hat Enterprise Linux 7 | qemu-kvm | Not affected |
| Red Hat Enterprise Linux 7 | qemu-kvm-rhev | Not affected |
| Red Hat Enterprise Linux 7 | qemu-kvm-ma | Not affected |
| Red Hat Enterprise Linux 6 | qemu-kvm | Not affected |
| Red Hat Enterprise Linux 5 | kvm | Not affected |
| Red Hat Enterprise Linux 5 | xen | Not affected |
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