CVE-2021-4207

NameCVE-2021-4207
DescriptionA flaw was found in the QXL display device emulation in QEMU. A double fetch of guest controlled values `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3099-1, DSA-5133-1, ELA-705-1

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+deb9u17vulnerable
stretch (lts), stretch1:2.8+dfsg-6+deb9u19fixed
buster (security), buster, buster (lts)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+deb12u7fixed
sid, trixie1:9.2.0+ds-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusourcejessie1:2.1+dfsg-12+deb8u23ELA-705-1
qemusourcestretch1:2.8+dfsg-6+deb9u18ELA-705-1
qemusourcebuster1:3.1+dfsg-8+deb10u9DLA-3099-1
qemusourcebullseye1:5.2+dfsg-11+deb11u2DSA-5133-1
qemusource(unstable)1:7.0+dfsg-1

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2036966
https://starlabs.sg/advisories/21/21-4207/
Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/9569f5cb5b4bffa9d3ebc8ba7da1e03830a9a895 (v7.0.0-rc4)

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