| Name | CVE-2023-3354 |
| Description | A flaw was found in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks whether the current number of connections crosses a certain threshold and if so, cleans up the previous connection. If the previous connection happens to be in the handshake phase and fails, QEMU cleans up the connection again, resulting in a NULL pointer dereference issue. This could allow a remote unauthenticated client to cause a denial of service. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3759-1, ELA-1063-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| qemu (PTS) | jessie, jessie (lts) | 1:2.1+dfsg-12+deb8u23 | vulnerable |
| stretch (security) | 1:2.8+dfsg-6+deb9u17 | vulnerable |
| stretch (lts), stretch | 1:2.8+dfsg-6+deb9u19 | fixed |
| buster (security), buster, buster (lts) | 1:3.1+dfsg-8+deb10u12 | fixed |
| bullseye | 1:5.2+dfsg-11+deb11u3 | fixed |
| bullseye (security) | 1:5.2+dfsg-11+deb11u2 | vulnerable |
| bookworm | 1:7.2+dfsg-7+deb12u7 | fixed |
| sid, trixie | 1:9.2.0+ds-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| qemu | source | stretch | 1:2.8+dfsg-6+deb9u19 | | ELA-1063-1 | |
| qemu | source | buster | 1:3.1+dfsg-8+deb10u12 | | DLA-3759-1 | |
| qemu | source | bullseye | 1:5.2+dfsg-11+deb11u3 | | | |
| qemu | source | bookworm | 1:7.2+dfsg-7+deb12u2 | | | |
| qemu | source | (unstable) | 1:8.0.4+dfsg-1 | | | |
Notes
https://bugzilla.redhat.com/show_bug.cgi?id=2216478
https://lists.nongnu.org/archive/html/qemu-devel/2023-07/msg01014.html
Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/5300472ec0990c61742d89b5eea1c1e6941f6d62 (v8.0.4)
[jessie] - qemu <postponed> (Minor issue, DoS)