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CVE-2018-16872

Status Candidate

Overview

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.

Related Files

Debian Security Advisory 4454-1
Posted May 31, 2019
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4454-1 - Multiple security issues were discovered in QEMU, a fast processor emulator, which could result in denial of service, the execution of arbitrary code or information disclosure.

tags | advisory, denial of service, arbitrary, info disclosure
systems | linux, debian
advisories | CVE-2018-11806, CVE-2018-12617, CVE-2018-16872, CVE-2018-17958, CVE-2018-18849, CVE-2018-18954, CVE-2018-19364, CVE-2018-19489, CVE-2019-12155, CVE-2019-3812, CVE-2019-6778, CVE-2019-9824
SHA-256 | cba000ba6722bbd7ea6515d914172a949427ee73bb4a672c4b7065b7f6df2144
Ubuntu Security Notice USN-3923-1
Posted Mar 27, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3923-1 - Michael Hanselmann discovered that QEMU incorrectly handled the Media Transfer Protocol. An attacker inside the guest could use this issue to read or write arbitrary files and cause a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.10. Michael Hanselmann discovered that QEMU incorrectly handled the Media Transfer Protocol. An attacker inside the guest could use this issue to read arbitrary files, contrary to expectations. This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, protocol
systems | linux, ubuntu
advisories | CVE-2018-16867, CVE-2018-16872, CVE-2018-19489, CVE-2018-20124, CVE-2018-20126, CVE-2018-20191, CVE-2018-20216, CVE-2019-3812, CVE-2019-6778
SHA-256 | bd50cf4e3724dde4eca89acd01b984093f41b59050ef6cddd19b55a916c3b163
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