CVE-2018-20024

NameCVE-2018-20024
DescriptionLibVNC before commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7 contains null pointer dereference in VNC client code that can result DoS.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1617-1, DLA-1979-1, DLA-2016-1, DSA-4383-1
Debian Bugs916941, 945827

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libvncserver (PTS)buster0.9.11+dfsg-1.3+deb10u4fixed
buster (security)0.9.11+dfsg-1.3+deb10u5fixed
bullseye0.9.13+dfsg-2+deb11u1fixed
sid, trixie, bookworm0.9.14+dfsg-1fixed
ssvnc (PTS)buster1.0.29-4+deb10u1fixed
bullseye1.0.29-5fixed
sid, trixie, bookworm1.0.29-6fixed
veyon (PTS)buster4.1.7+repack1-1fixed
bullseye4.5.3+repack1-1fixed
sid, trixie, bookworm4.7.5+repack1-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
italcsourcejessie1:2.0.2+dfsg1-2+deb8u1DLA-1979-1
italcsourcestretch1:3.0.3+dfsg1-1+deb9u1
italcsource(unstable)(unfixed)
libvncserversourcejessie0.9.9+dfsg2-6.1+deb8u4DLA-1617-1
libvncserversourcestretch0.9.11+dfsg-1.3~deb9u1DSA-4383-1
libvncserversource(unstable)0.9.11+dfsg-1.2916941
ssvncsourcejessie1.0.29-2+deb8u1DLA-2016-1
ssvncsourcestretch1.0.29-3+deb9u1
ssvncsourcebuster1.0.29-4+deb10u1
ssvncsource(unstable)1.0.29-5945827
veyonsource(unstable)4.1.4+repack1-1

Notes

https://github.com/LibVNC/libvncserver/issues/254
https://github.com/LibVNC/libvncserver/commit/4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-034-libvnc-null-pointer-dereference/

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