CVE-2018-16872

NameCVE-2018-16872
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1694-1, DSA-4454-1
Debian Bugs916397

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
qemu (PTS)jessie, jessie (lts)1:2.1+dfsg-12+deb8u23fixed
stretch (security)1:2.8+dfsg-6+deb9u17fixed
stretch (lts), stretch1:2.8+dfsg-6+deb9u19fixed
buster1:3.1+dfsg-8+deb10u8fixed
buster (security)1:3.1+dfsg-8+deb10u12fixed
bullseye1:5.2+dfsg-11+deb11u3fixed
bullseye (security)1:5.2+dfsg-11+deb11u2fixed
bookworm1:7.2+dfsg-7+deb12u6fixed
trixie1:8.2.4+ds-1fixed
sid1:9.0.2+ds-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusourcewheezy(unfixed)end-of-life
qemusourcejessie1:2.1+dfsg-12+deb8u10DLA-1694-1
qemusourcestretch1:2.8+dfsg-6+deb9u6DSA-4454-1
qemusource(unstable)1:3.1+dfsg-2916397
qemu-kvmsourcewheezy(unfixed)end-of-life
qemu-kvmsource(unstable)(unfixed)

Notes

https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg03135.html
https://git.qemu.org/?p=qemu.git;a=commit;h=bab9df35ce73d1c8e19a37e2737717ea1c984dc1

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