CVE-2023-3255

NameCVE-2023-3255
DescriptionA flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to trigger a denial of service.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
qemu (PTS)buster1:3.1+dfsg-8+deb10u8fixed
buster (security)1:3.1+dfsg-8+deb10u10fixed
bullseye (security), bullseye1:5.2+dfsg-11+deb11u2fixed
bookworm1:7.2+dfsg-7+deb12u1vulnerable
sid, trixie1:8.1.0+ds-6fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusourcebuster(not affected)
qemusourcebullseye(not affected)
qemusource(unstable)1:8.0.4+dfsg-1

Notes

[bookworm] - qemu <no-dsa> (Minor issue)
[bullseye] - qemu <not-affected> (Vulnerable code not present)
[buster] - qemu <not-affected> (Vulnerable code not present)
https://bugzilla.redhat.com/show_bug.cgi?id=2218486
Proposed patch: https://lists.nongnu.org/archive/html/qemu-devel/2023-07/msg00596.html
Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/35720b3d90866ed4c174eb35762e04a1b9e533d1 (v8.0.4)
Introduced by: https://gitlab.com/qemu-project/qemu/-/commit/0bf41cab93e5c72dcda717abd625698b59d9ba3e (v6.1.0-rc0)

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